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108-460: Since its introduction, three generations of the B series engine have been produced, offered in both inline-four and inline-six configurations in multiple displacements. The B-series features engine bores machined directly into the block (rather than the wet liners used on earlier Cummins engines). It is also set apart by the use of a shallow one-piece head, requiring closer tolerances than in other Cummins products. Unlike earlier diesel engines

216-435: A V4 engine or a flat-four engine , a straight-four engine only has one cylinder head , which reduces complexity and production cost. Petrol straight-four engines used in modern production cars typically have a displacement of 1.3–2.5 L (79–153 cu in), but larger engines have been used in the past, for example the 1927–1931 Bentley 4½ Litre . Diesel engines have been produced in larger displacements, such as

324-400: A secondary imbalance . This is caused by the acceleration/deceleration of the pistons during the top half of the crankshaft rotation being greater than that of the pistons in the bottom half of the crankshaft rotation (because the connecting rods are not infinitely long). As a result, two pistons are always accelerating faster in one direction, while the other two are accelerating more slowly in

432-477: A slant-four . Between 2005 and 2008, the proportion of new vehicles sold in the United States with four-cylinder engines rose from 30% to 47%. By the 2020 model year, the share for light-duty vehicles had risen to 59%. A four-stroke straight-four engine always has a cylinder on its power stroke, unlike engines with fewer cylinders where there is no power stroke occurring at certain times. Compared with

540-431: A tarpaulin stretched above the passenger seating. In 1915, International Harvester constructed its first school bus; today, its successor company Navistar still produces school bus cowled chassis. In 1919, the usage of school buses became funded in all 48 U.S. states. In 1927, Ford dealership owner A.L. Luce produced a bus body for a 1927 Ford Model T . The forerunner of the first Blue Bird school buses, steel

648-631: A 3.2 L turbocharged Mitsubishi engine (used the Pajero/Shogun/Montero SUV) and a 3.0 L Toyota engine. European and Asian trucks with a gross vehicle weight rating between 7.5 and 18 tonnes typically use inline four-cylinder diesel engines with displacements around 5 litres. Larger displacements are found in locomotive, marine and stationary engines. Displacement can also be very small, as found in kei cars sold in Japan. Several of these engines had four cylinders at

756-481: A 600 cc (36.6 cu in) inline-four engine made by Honda based on the CBR600RR with a maximum power output of 110 kW (150 hp). Starting in 2019 , the engines were replaced by a Triumph 765 cc (46.7 cu in) triple engine . Inline-four engines are also used in light duty commercial vehicles such as Karsan Jest and Mercedes-Benz Sprinter . School buses A school bus

864-662: A Bosch VP44 high pressure pump. Later ISB designs have common rail fuel injection, Bosch injectors, and a Bosch CP3 high pressure pump. Midway through model year 1998, the Dodge Ram switched from the 6BT to the ISB to meet updated emissions requirements. Like other ISB's, these engines started out using the Bosch VP44 rotary injection pump. The VP44 setup meant that timing and fuel could be precisely controlled, which led to cleaner emissions. However, VP44 failure rates were higher than

972-466: A bus to a rollover test in 1964, in 1969, Ward Body Works pointing that fasteners had a direct effect on joint quality (and that body manufacturers were using relatively few rivets and fasteners). In its own research, Wayne Corporation discovered that the body joints were the weak points themselves. In 1973, to reduce the risk of body panel separation, Wayne introduced the Wayne Lifeguard ,

1080-430: A certain distance from home (particularly as students progressed into high school). In all but the most isolated areas, one-room schools from the turn of the century had become phased out in favor of multi-grade schools introduced in urban areas. In another change, school districts shifted bus operation from buses operated by single individuals to district-owned fleets (operated by district employees). From 1950 to 1982,

1188-444: A chassis supplied by Spartan Motors , Lion produces conventional-style school buses, its design features several firsts for school bus production. Along with a 102-inch body width, to resist corrosion, Lion uses composite body panels in place of steel. In 2015, Lion introduced the eLion, the first mass-produced school bus with a fully electric powertrain. Small school buses have undergone few fundamental changes to their designs during

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1296-564: A compression ratio of 16.5:1. The 4.5 L ISB is essentially a four-cylinder, two-thirds version of the 6.7 L ISB rated at 185 hp (138 kW), used in the New Routemaster , a series hybrid diesel-electric doubledecker bus in London . The 5.9 L; 359.0 cu in (5,883 cc) ISB ( I nteract S ystem B ) is one of the largest straight-six engines used for light truck vehicles and school buses , and

1404-571: A consistent training level. In contrast to the 1970s focus on structural integrity, design advances during the 1980s and 1990s focused around the driver. In 1979 and 1980, International Harvester and Ford each introduced a new-generation bus chassis, with General Motors following suit in 1984. To increase driver visibility, updates in line with chassis redesigns shifted the bus driver upward, outward, and forward. To decrease driver distraction, interior controls were redesigned with improved ergonomics ; automatic transmissions came into wider use, preventing

1512-423: A contract facilitated by Advanced Energy to IC Bus to produce the buses. Although the buses produced significant benefits, the buses were slowly discontinued when the hybrid system manufacture Enova faded into financial challenges. In 2011, Lion Bus (renamed Lion Electric Company) of Saint-Jérôme, Quebec was founded, marking the first entry into the segment in over 20 years by a full-size bus manufacturer. Using

1620-600: A displacement of 1.5–2.5 L (92–153 cu in). The smallest automotive straight-four engine was used in the 1963–1967 Honda T360 kei truck and has a displacement of 356 cc (21.7 cu in), while the largest mass-produced straight-four car engine is the 1999–2019 Mitsubishi 4M41 diesel engine which was used in the Mitsubishi Pajero and has a displacement of 3.2 L (195 cu in). Significant straight-four car engines include: Many early racing cars used straight-four engines, however

1728-615: A full-size bus. For this role, manufacturers initially began the use of yellow-painted utility vehicles such as the International Travelall and Chevrolet Suburban . As another alternative, manufacturers began use of passenger vans, such as the Chevrolet Van/GMC Handi-Van , Dodge A100 , and Ford Econoline ; along with yellow paint, these vehicles were fitted with red warning lights. While more maneuverable, automotive-based school buses did not offer

1836-537: A large scale. Although school bus design had moved away from the wagon-style kid hacks of the generation before, there was not yet a recognized set of industry-wide standards for school buses. In 1939, rural education expert Dr. Frank W. Cyr organized a week-long conference at Teachers College, Columbia University that introduced new standards for the design of school buses. Funded by a $ 5,000 grant, Dr. Cyr invited transportation officials, representatives from body and chassis manufacturers, and paint companies. To reduce

1944-562: A period of transition, with several ownership changes leading to joint ventures and alignments between body manufacturers and chassis suppliers. In 1986, with the signing of the Commercial Motor Vehicle Safety Act, school bus drivers across the United States became required to acquire a commercial driver's license (CDL) . While CDLs were issued by individual states, the federal CDL requirement ensured that drivers of all large vehicles (such as school buses) had

2052-476: A school bus body with single-piece body side and roof stampings. While single-piece stampings seen in the Lifeguard had their own manufacturing challenges, school buses of today use relatively few side panels to minimize body joints. During the 1970s, school buses would undergo a number of design upgrades related to safety. While many changes were related to protecting passengers, others were intended to minimize

2160-410: A school bus is about to stop and unload/load students. Adopted by a number of states during the mid-1970s, amber warning lights became nearly universal equipment on new school buses by the end of the 1980s. To supplement the additional warning lights and to help prevent drivers from passing a stopped school bus, a stop arm was added to nearly all school buses; connected to the wiring of the warning lights,

2268-505: A smaller degree of transition. As International Harvester became Navistar International in 1986, the company released updated bus chassis for 1989; in 1996, it produced its first rear-engine bus chassis since 1973. In late 1996, Freightliner produced its first bus chassis, expanding to four manufacturers for the first time since the exit of Dodge in 1977. Ford and General Motors gradually exited out of cowled-chassis production with Ford producing its last chassis after 1998; General Motors exited

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2376-470: A standard output and a high output ISB Cummins engine were offered. The standard output, which was the same as the previous engines was rated to 235 hp (175 kW; 238 PS) and 460 lb⋅ft (624 N⋅m) when equipped with either a manual transmission or automatic. The high output ISB was rated at 245 hp (183 kW; 248 PS) and 505 lb⋅ft (685 N⋅m), with only a NV5600 six-speed manual transmission available. The high output engine

2484-406: A straight-four layout (with the exceptions of the flat-four engines produced by Subaru and Porsche) and the layout is also very common in motorcycles and other machinery. Therefore the term "four-cylinder engine" is usually synonymous with straight-four engines. When a straight-four engine is installed at an inclined angle (instead of with the cylinders oriented vertically), it is sometimes called

2592-467: A substantial improvement in safety performance. While many changes related to the 1977 safety standards were made under the body structure (to improve crashworthiness ), the most visible change was to passenger seating. In place of the metal-back passenger seats seen since the 1930s, the regulations introduced taller seats with thick padding on both the front and back, acting as a protective barrier. Further improvement has resulted from continuing efforts by

2700-430: A supplemental exit. Alongside safety, body and chassis manufacturers sought to advance fuel economy of school buses. During the 1980s, diesel engines came into wide use in conventional and small school buses, gradually replacing gasoline-fueled engines. In 1987, International became the first chassis manufacturer to offer diesel engines exclusively, with Ford following suit in 1990. While conventional-style buses remained

2808-401: A time when regulations dictated a maximum displacement of 550 cc; the maximum size is currently at 660 cc. Straight-four engines with the preferred crankshaft configuration have perfect primary balance . This is because the pistons are moving in pairs, and one pair of pistons is always moving up at the same time as the other pair is moving down. However, straight-four engines have

2916-481: A van cab with a purpose-built bus body, using the same construction as a full-size school bus. Within the same length as a passenger van, buses such as the Wayne Busette and Blue Bird Micro Bird offered additional seating capacity, wheelchair lifts, and the same body construction as larger school buses. For school bus manufacturers, the 1980s marked a period of struggle, following a combination of factors. As

3024-501: Is a deep-skirt engine block and extra-strong connecting rods. A Holset turbocharger is used. The original B Series was updated with 24 valves and an electronic engine management system to become the ISB in 1998. Euro 6 (2015–present) Euro 4 (2005–2008) Euro 5 (2008–2013) Euro 6 (2014–present) The 3.9-liter 4B/4BT/4BTA Cummins is categorized under the B Engine family alongside the 5.9-liter 6B/6BT/6BTA Cummins diesel engines . The 3.9

3132-451: Is an inline four-cylinder , either naturally aspirated (4B) or turbodiesel (4BT/4BTA), which was popular for many step van applications including bread vans and other commercial vehicles. Additionally it has seen broad usage in agricultural equipment. It has also gained popularity as an engine swap into smaller trucks and SUVs. The lowest powered, naturally aspirated 3.9-liter Cummins, the 4B, produces 53 hp (40 kW). This variant

3240-419: Is any type of bus owned, leased, contracted to, or operated by a school or school district . It is regularly used to transport students to and from school or school-related activities, but not including a charter bus or transit bus . Various configurations of school buses are used worldwide ; the most iconic examples are the yellow school buses of the United States which are also found in other parts of

3348-511: Is electronically controlled common-rail injection. It has been used in Cummins B Series engines and the B-Series based NEF engine since 2003. Inline-four engine A straight-four engine (also referred to as an inline-four engine ) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The majority of automotive four-cylinder engines use

Cummins B Series engine - Misplaced Pages Continue

3456-455: Is most commonly found in equipment such as generators and wood chippers. The 4BT is one of two turbocharged variants of the 3.9L B-Series engine. It has two valves per cylinder for a total of eight. The most common output of this variant is 105 horsepower. The 4BTA is turbocharged, and aftercooled with four valves per cylinder for a total of sixteen. The most common output of this variant is 170 horsepower. The 5.9 L Cummins, also known as

3564-454: Is over 70 times safer than riding to school by car. Many fatalities related to school buses are passengers of other vehicles and pedestrians (only 5% are bus occupants). Since the initial development of consistent school bus standards in 1939, many of the ensuing changes to school buses over the past eight decades have been safety related, particularly in response to more stringent regulations adopted by state and federal governments. Ever since

3672-517: Is particularly beneficial in the higher rpm range, and " big-bang firing order " theory says the irregular delivery of torque to the rear tire makes sliding in the corners at racing speeds easier to control. Inline-four engines are also used in MotoGP by the Suzuki (since 2015 ) and Yamaha (since 2002 ) teams. In 2010 , when the four-stroke Moto2 class was introduced, the engines for the class were

3780-471: Is used to increase the output in the high-compression (17.2:1 in recent versions) diesel. It is an all-iron engine with forged steel connecting rods , an assembled camshaft , and a cast aluminum intake manifold . The engine is produced in Columbus, Indiana . The ISB uses electronically controlled Bosch fuel systems, unlike the 6BT systems which were mechanical. Early ISB engines utilize Bosch injectors and

3888-608: The Crown Supercoach seated up to 76 passengers, the highest-capacity school bus of the time. As the 1930s progressed, flat-front school buses began to follow motorcoach design in styling as well as engineering, gradually adopting the term "transit-style" for their appearance. In 1940, the first mid-engined transit school bus was produced by Gillig in California. The custom-built nature of school buses created an inherent obstacle to their profitable mass production on

3996-700: The Kokomo Transmission plant in Kokomo, Indiana . Engine torque is slightly reduced with the Mercedes G56 6-speed manual transmission at 350 hp (261 kW; 355 PS) and 610 lb⋅ft (827 N⋅m). The 2007 and newer 3500 Cab & Chassis trucks only get the 305 hp (227 kW; 309 PS) and 610 lb⋅ft (827 N⋅m) version of the B6.7, whether it has the Aisin AS68RC or

4104-470: The Maserati 4CL and various English Racing Automobiles (ERA) models. These were resurrected after the war, and formed the foundation of what was later to become Formula One , although the straight-eight supercharged Alfettas would dominate the early years of F1. Another engine that played an important role in racing history is the straight-four Ferrari engine designed by Aurelio Lampredi . This engine

4212-604: The National Highway Traffic Safety Administration (NHTSA) and the National Transportation Safety Board (NTSB) , school buses are the safest type of road vehicle. Between 2013 and 2022, there were 976 fatal school bus accidents, resulting in 1,082 deaths and approximately 132,000 injuries. On average, five fatalities involve school-age children on a school bus each year; statistically, a school bus

4320-530: The baby boomer generation was either in elementary or high school, leading to a significant increase in student populations across North America; this would be a factor that would directly influence school bus production for over three decades. During the 1950s, as student populations began to grow, larger school buses began to enter production. To increase seating capacity (extra rows of seats), manufacturers began to produce bodies on heavier-duty truck chassis; transit-style school buses also grew in size. In 1954,

4428-604: The "12-Valve" Cummins was the first member of the Cummins B-Series to be used in a light truck vehicle. The 6BT used Bosch fuel systems, injector, and VE rotary pump and P7100 inline injection pumps. Some early 6BTs were supplied with CAV rotary pumps instead, before the Bosch system became the sole standard. This engine started life in 1984 designed as an agricultural engine, for use in Case agricultural equipment. After 1989,

Cummins B Series engine - Misplaced Pages Continue

4536-533: The 1920s and early 1930s. The Miller engine evolved into the Offenhauser engine which had a highly successful spanning from the 1933 until 1981, including five straight victories at the Indianapolis 500 from 1971 to 1976. Many cars produced for the pre-WWII voiturette Grand Prix motor racing category used inline-four engine designs. 1.5 L supercharged engines found their way into cars such as

4644-522: The 1939 conference have been modified or updated, one part of its legacy remains a key part of every school bus in North America today: the adoption of a standard paint color for all school buses. While technically named "National School Bus Glossy Yellow", school bus yellow was adopted for use since it was considered easiest to see in dawn and dusk, and it contrasted well with black lettering. While not universally used worldwide, yellow has become

4752-441: The 1970s. Since then, the inline-four has become one of the most common engine configurations in street bikes. Outside of the cruiser category, the inline-four is the most common configuration because of its relatively high performance-to-cost ratio. All major Japanese motorcycle manufacturers offer motorcycles with inline-four engines, as do MV Agusta and BMW . BMW's earlier inline-four motorcycles were mounted horizontally along

4860-406: The 1989–1998 Dodge Ram pickup truck, it became a popular alternative to the large gasoline V8 engines normally used in full-size pickup trucks, since it produced torque at low engine RPM, and achieved significantly better fuel mileage. Due to the direct fuel injection, the 6BT has no glowplugs. The 6BTA is Turbocharged, and aftercooled, with a air to water after cooler mounted on the intake. Has

4968-593: The 1990s, small school buses shifted further away from their van-conversion roots. In 1991, Girardin launched the MB-II, combining a single rear-wheel van chassis with a full cutaway bus body. Following the 1992 redesign of the Ford E-Series and the 1997 launch of Chevrolet Express/GMC Savana cutaway chassis, manufacturers followed suit, developing bodies to optimize loading-zone visibility. As manufacturers universally adopted cutaway bodies for single rear-wheel buses,

5076-561: The 19th century, many rural areas of the United States and Canada were served by one-room schools . For those students who lived beyond practical walking distance from school, transportation was facilitated in the form of the kid hack ; at the time, " hack " was a term referring to certain types of horse-drawn carriages. Essentially re-purposed farm wagons, kid hacks were open to the elements, with little to no weather protection. In 1892, Indiana-based Wayne Works (later Wayne Corporation ) produced its first "school car" A purpose-built design,

5184-469: The 2.4 litre Citroën DS engine, the 2.6 litre Austin-Healey 100 engine, the 3.3 L Ford Model A (1927) engine and the 2.5 L GM Iron Duke engine . Soviet/Russian GAZ Volga and UAZ engines with displacements of up to 2.9 litres were produced without balance shafts from the 1950s to the 1990s, however these were relatively low-revving engines which reduces the need for a balance shaft system. Most modern straight-four engines used in cars have

5292-666: The 2000s, though the Type B configuration has largely been retired from production. Following the 1998 sale of the General Motors P-chassis to Navistar subsidiary Workhorse , the design began to be phased out in favor of higher-capacity Type A buses. In 2006, IC introduced the BE200 as its first small school bus; a fully cowled Type B, the BE200 shared much of its body with the CE (on a lower-profile chassis). In 2010, IC introduced

5400-479: The 47RE was upgraded internally to increase durability and torque capacity, now known as the 48RE . The 2003 rating for the Dodge truck was released at 305 hp (227 kW; 309 PS) and 555 lb⋅ft (752 N⋅m). Midway through the 2004 model year, the Cummins 600 was introduced, producing 325 hp (242 kW; 330 PS) at 2,900 rpm and 600 lb⋅ft (813 N⋅m) at 1,600 rpm. This engine

5508-405: The 6BT engine was used in light duty , medium duty and select heavy duty trucks and buses. The 6BT engine has recently become very popular for use in repowering various vehicles. The 6B is the naturally aspirated version of the 6BT with the power output of between 150 and 173 hp and with the compression ratio of 19:1. There were no OEM automotive applications for 6B engines. Appearing in

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5616-793: The AE-series, a cutaway-cab school bus (derived from the International TerraStar ). In 2015, the Ford Transit cutaway chassis was introduced (alongside the long-running E350/450); initially sold with a Micro Bird body, the Transit has been offered through several manufacturers. In 2018, the first bus derived from the Ram ProMaster cutaway chassis was introduced; Collins Bus introduced the Collins Low Floor,

5724-602: The B-series Cummins used direct injection and did not need glow plugs for cold starting. The engine was first manufactured in Rocky Mount, North Carolina, and other plants were later added in Mexico, Brazil, Turkey, and Darlington, UK. Every Cummins powered Dodge Pickup (since initial production in 1989) has come equipped with a turbocharger. It uses a gear-drive camshaft for extra reliability. Also specified

5832-571: The Mercedes G56 6-speed manual transmission. As for the 2008 4500/5500 medium duty Chassis Cabs or the Sterling Bullet Trucks, they receive the 350 hp (261 kW; 355 PS) and 610 lb⋅ft (827 N⋅m) version of the B6.7, whether it has the Aisin AS68RC or the Mercedes G56 6-speed manual transmission. Late model 2011 Ram trucks produce 350 hp (261 kW; 355 PS) and 800 lb⋅ft (1,085 N⋅m), with

5940-515: The Peugeot engine which won the 1913 Indianapolis 500 was a highly influential engine. Designed by Ernest Henry , this engine had double overhead camshafts (DOHC) with four valves per cylinder, a layout that would become the standard until today for racing inline-four engines. Amongst the engines inspired by the Peugeot design was the Miller engine , which was a successful racing engine through

6048-427: The U.S. National Highway Traffic Safety Administration (NHTSA) and Transport Canada , as well as by the bus industry and various safety advocates. As of 2020 production, all of these standards remain in effect. As manufacturers sought to develop safer school buses, small school buses underwent a transition away from automotive-based vehicles. The introduction of cutaway van chassis allowed bus manufacturers to mate

6156-594: The United States, Nimbus in Denmark, Windhoff in Germany, and Wilkinson in the United Kingdom. The first across-the-frame 4-cylinder motorcycle was the 1939 racer Gilera 500 Rondine , it also had double-over-head camshafts, forced-inducting supercharger and was liquid-cooled . Modern inline-four motorcycle engines first became popular with Honda 's SOHC CB750 introduced in 1969, and others followed in

6264-624: The Vision utilized a proprietary chassis (rather than a design from a medium-duty truck). In 2004, Thomas introduced the Saf-T-Liner C2 (derived from the Freightliner M2 ), with the body designed alongside its chassis (allowing the use of the production Freightliner dashboard). A trait of both the Vision and C2 (over their predecessors) is improved loading-zone visibility; both vehicles adopted highly sloped hoods and extra glass around

6372-516: The Ward brand name in 1993. In 1992, Blue Bird would change hands for the first of several times. In 1998, Carpenter was acquired by Spartan Motors and Thomas Built Buses was sold to Freightliner; the latter was the final major school bus manufacturer operating under family control. Alongside the 1981 introduction of Mid Bus, Corbeil commenced production in Canada and the United States in 1985. Following

6480-526: The West Coast). From 1980 to 2001, all eight bus manufacturers would undergo periods of struggle and ownership changes. In 1980, Ward filed for bankruptcy, reorganizing as AmTran in 1981. The same year, Superior was liquidated by its parent company, closing its doors. Under its company management, Superior was split into two manufacturers, with Mid Bus introducing small buses in 1981 and a reorganized Superior producing full-size buses from 1982 to 1985. At

6588-402: The adoption of yellow as a standard color in 1939, school buses deliberately integrate the concept of conspicuity into their design. When making student dropoffs or pickups, traffic law gives school buses priority over other vehicles; in order to stop traffic, they are equipped with flashing lights and a stop sign. As a consequence of their size, school buses have a number of blind spots around

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6696-418: The aspect of customer choice was largely ended (as a result of corporate ownership and supply agreements), decreased complexity paved the way for new product innovations previously thought impossible. During the 2010s, while diesel engines have remained the primary source of power, manufacturers expanded the availability of alternative-fuel vehicles, including CNG, propane, gasoline, and electric-power buses. At

6804-481: The beginning of the 2000s, manufacturers introduced a new generation of conventional-style school buses, coinciding with the redesign of several medium-duty truck lines. While Ford and General Motors shifted bus production to cutaway chassis, Freightliner and International released new cowled chassis in 2004 and 2005, respectively. In 2003, Blue Bird introduced the Vision conventional; in line with its transit-style buses,

6912-422: The chances of traffic collisions . To decrease confusion over traffic priority (increasing safety around school bus stops), federal and state regulations were amended, requiring for many states/provinces to add amber warning lamps inboard of the red warning lamps. Similar to a yellow traffic light, the amber lights are activated before stopping (at 100–300 feet (30.5–91.4 m) distance), indicating to drivers that

7020-414: The complexity of school bus production and increase safety, a set of 44 standards were agreed upon and adopted by the attendees (such as interior and exterior dimensions and the forward-facing seating configuration). To allow for large-scale production of school buses among body manufacturers, adoption of these standards allowed for greater consistency among body manufacturers. While many of the standards of

7128-423: The decade began, the end of the baby-boom generation had finished high school; with a decrease in student population growth, school bus manufacturing was left with a degree of overcapacity. Coupled with the recession economy of the early 1980s, the decline in demand for school bus production left several manufacturers in financial ruin. To better secure their future, during the 1990s, school bus manufacturers underwent

7236-424: The deployable stop arm extended during a bus stop with its own set of red flashing lights. In the 1970s, school busing expanded further, under controversial reasons; a number of larger cities began to bus students in an effort to racially integrate schools . Out of necessity, the additional usage created further demand for bus production. From 1939 to 1973, school bus production was largely self-regulated. In 1973,

7344-404: The deployment of the exterior stop arms. Onboard GPS tracking devices have taken on a dual role of fleet management and location tracking, allowing for internal management of costs and also to alert waiting parents and students of the real-time location of their bus. Seatbelts in school buses underwent a redesign, with lap-type seatbelts phased out in favor of 3-point seatbelts . According to

7452-657: The end of 1989, Carpenter would file for bankruptcy, emerging from it in 1990. In 1991, Crown Coach would close its doors forever; Gillig produced its last school bus in 1993. Following several ownership changes, Wayne Corporation was liquidated in 1992; successor Wayne Wheeled Vehicles was closed in 1995. In 2001, Carpenter closed its doors. During the 1990s, as body manufacturers secured their future, family-owned businesses were replaced by subsidiaries as manufacturers underwent mergers, joint ventures, and acquisitions with major chassis suppliers. In 1991, Navistar began its acquisition of AmTran (fully acquiring it in 1995), phasing out

7560-581: The entry door. In 2005, IC introduced a redesigned CE-series to fit the International 3300 chassis; to improve visibility, the windshield was redesigned (eliminating the center post). Between 2004 and 2008, Advanced Energy, an NC based non-profit created by the NC Utilities Commission begun an effort to move to plug-in hybrid school buses . A business and technical feasibility proved the benefits, and in 2006, 20 districts awarded

7668-479: The exhaust brake rating boosted from 150 hp (112 kW; 152 PS) to 222 hp (166 kW; 225 PS). For 2019 this engine has been updated to produce 400 hp and 1000 ft-lb torque. It is also used in the Blue Bird Vision , Thomas Saf-T-Liner C2 , and IC CE school buses and BMC Procity city buses There are many changes over the previous 5.9 L ISB for the Dodge truck,

7776-593: The first Canadian-brand full-size buses sold in the United States). During the 2010s, Collins retired the Mid Bus and Corbeil brands (in 2013 and 2016, respectively). During the 2000s, school bus safety adopted a number of evolutionary advances. To further improve visibility for other drivers, manufacturers began to replace incandescent lights with LEDs for running lights, turn signals, brake lights, and warning lamps. School bus crossing arms , first introduced in

7884-511: The first decade of the 20th century, several developments would affect the design of the school bus and student transport. As vehicles evolved from horse-drawn to "horseless" propulsion on a wider basis, the wagon bodies of kid hacks and school cars were adapted to truck frames. While transitioning into purpose-built designs, a number of features from wagons were retained, including wood construction, perimeter bench seating, and rear entry doors. Weather protection remained minimal; some designs adopted

7992-558: The first diesel-engined school bus was introduced, with the first tandem-axle school bus in 1955 (a Crown Supercoach, expanding seating to 91 passengers). To improve accessibility , at the end of the 1950s, manufacturers developed a curbside wheelchair lift option to transport wheelchair-using passengers. In modified form, the design remains in use today. During the 1950s and 1960s, manufacturers also began to develop designs for small school buses, optimized for urban routes with crowded, narrow streets along with rural routes too isolated for

8100-453: The first federal regulations governing school buses went into effect, as FMVSS 217 was required for school buses; the regulation governed specifications of rear emergency exit doors/windows. Following the focus on school bus structural integrity, NHTSA introduced the four Federal Motor Vehicle Safety Standards for School Buses, applied on April 1, 1977, bringing significant change to the design, engineering, and construction of school buses and

8208-466: The first low-floor school bus (of any configuration). Following the 2001 closure of Carpenter, the manufacturing segment has seen a much lower degree of contraction (with the exception of the 2005 failure of startup manufacturer Liberty Bus ). Following the bankruptcy of Corbeil, the company was acquired at the end of 2007 by Collins, reorganizing it as a subsidiary (alongside Mid Bus) and shifting production to its Kansas facilities. The same year, U.S. Bus

8316-471: The frame, but all current four-cylinder BMW motorcycles have transverse engines . The modern Triumph company has offered inline-four-powered motorcycles, though they were discontinued in favour of triples . The 2009 Yamaha R1 has an inline-four engine that does not fire at even intervals of 180°. Instead, it uses a crossplane crankshaft that prevents the pistons from simultaneously reaching top dead centre. This results in better secondary balance , which

8424-408: The front curbside, becoming a door operated by the driver (to ease loading passengers and improve forward visibility). The rear entry door of the kid hacks were re-purposed (as an emergency exit). Following the introduction of the steel-paneled 1927 Luce bus, school bus manufacturing began to transition towards all-steel construction. In 1930, both Superior and Wayne introduced all-steel school buses;

8532-501: The improved high output 600 version was on the Ward's 10 Best Engines list for 2004. One unusual feature of the ISB is that it is a multi-valve pushrod engine design, with four valves per cylinder (popularly referred to as the "24-Valve" Cummins). The engine displaces 5.9 L; 359.0 cu in (5,883 cc), with a 102 mm × 120 mm (4.02 in × 4.72 in) cylinder bore and piston stroke. A turbocharger

8640-567: The large 2,495 cc FPF that won the Formula One championship in Cooper 's chassis in 1959 and 1960. In Formula One, the 1980s were dominated by the 1,500 cc turbocharged cars. The BMW M12/13 engine was notable for the era for its high boost pressures and performance. The cast iron block was based on a standard road car block and powered the F1 cars of Brabham, Arrows and Benetton and won

8748-403: The late 1990s, came into wider use. Electronics took on a new role in school bus operation. To increase child safety and security, alarm systems have been developed to prevent children from being left on unattended school buses overnight. To track drivers who illegally pass school buses loading and unloading students, in the 2010s, some school buses began to adopt exterior cameras synchronized with

8856-411: The latter introduced safety glass windows for its bus body. As school bus design paralleled the design of light to medium-duty commercial trucks of the time, the advent of forward-control trucks would have their own influence on school bus design. In an effort to gain extra seating capacity and visibility, Crown Coach built its own cabover school bus design from the ground up. Introduced in 1932,

8964-518: The loss of the trucks exhaust brake. The 5.9 L QSB (Quantum System B) is an off-road, heavy duty version of the ISB. Typically used in marine, agricultural, and construction applications, these engines share many of the same parts as the ISB and utilize the same Bosch fuel system. In the earlier models of the Cummins B-Series Engine, it was almost entirely mechanical including its fuel system. The fuel pump used in these engines

9072-525: The most obvious being the larger displacement. The 6.7 ISB had an increase of cylinder bore and piston stroke to 107 mm × 124 mm (4.21 in × 4.88 in), respectively, thereby giving a displacement of 6.7 L; 408.2 cu in (6,690 cc). With the 6.7 L ISB came the introduction of the Variable Geometry Turbocharger (VGT). The VG Turbocharger was introduced to reduce turbo lag by adjusting

9180-567: The most widely produced full-size school bus, interest in forward visibility, higher seating capacity, and shorter turning radius led to a major expansion of market share of the transit-style configuration, coinciding with several design introductions in the late 1980s. Following the 1986 introduction of the Wayne Lifestar , the AmTran Genesis, Blue Bird TC/2000 , and Thomas Saf-T-Liner MVP would prove far more successful. During

9288-413: The older P7100 injection pump. The compression ratio in these engines was 17.2:1. The 1998–2000 ISB was rated at 215 hp (160 kW; 218 PS) and 420 lb⋅ft (569 N⋅m) when equipped with the 47RE automatic transmission . The 1998–2000 ISB was rated at 235 hp (175 kW; 238 PS) and 460 lb⋅ft (624 N⋅m) when equipped with a manual transmission. For the 2001–2002 years,

9396-420: The other direction, which leads to a secondary dynamic imbalance that causes an up-and-down vibration at twice crankshaft speed. This imbalance is common among all piston engines, but the effect is particularly strong on four-stroke inline-four because of the two pistons always moving together. The strength of this imbalance is determined by the reciprocating mass, the ratio of connecting rod length to stroke, and

9504-432: The outside of the vehicle which can endanger passengers disembarking a bus or pedestrians standing or walking nearby. To address this safety challenge, a key point of school bus design is focused on exterior visibility, improving the design of bus windows, mirrors, and the windshield to optimize visibility for the driver. In the case of a collision, the body structure of a school bus is designed with an integral roll cage ; as

9612-405: The peak piston velocity. Therefore, small displacement engines with light pistons show little effect, and racing engines use long connecting rods. However, the effect grows quadratically with engine speed (rpm). Four-stroke engines with five or more cylinders are able to have at least one cylinder performing its power stroke at any given point in time. However, four-cylinder engines have gaps in

9720-399: The power delivery, since each cylinder completes its power stroke before the next piston starts a new power stroke. This pulsating delivery of power results in more vibrations than engines with more than four cylinders. A balance shaft system is sometimes used to reduce the vibrations created by a straight-four engine, most often in engines with larger displacements. The balance shaft system

9828-432: The reinforced passenger compartment of a full-size school bus. During the 1960s, as with standard passenger cars, concerns began to arise for passenger protection in catastrophic traffic collisions. At the time, the weak point of the body structure was the body joints; where panels and pieces were riveted together, joints could break apart in major accidents, with the bus body causing harm to passengers. After subjecting

9936-590: The risk of stalling (in hazardous places such as intersections or railroad crossings). Initially introduced during the late 1960s, crossview mirrors came into universal use, improving the view of the blind spots in front of the bus while loading or unloading. To supplement the rear emergency door in an evacuation, manufacturers introduced additional emergency exits during the 1980s, including roof-mounted escape hatches and outward-opening exit windows. Side-mounted exit doors (originally introduced on rear-engine buses), became offered on front-engine and conventional-body buses as

10044-504: The school car was constructed with perimeter-mounted wooden bench seats and a roof (the sides remained open). As a horse-drawn wagon, the school car was fitted with a rear entrance door (intended to avoid startling the horses while loading or unloading passengers); over a century later, the design remains in use (as an emergency exit). In 1869, Massachusetts became the first state to add transportation to public education; by 1900, 16 other states would transport students to school. Following

10152-568: The second (and final) closure of Superior in 1986, New Bus Company acquired the rights to its body design, producing buses from 1988 to 1989. In 1991, TAM-USA was a joint venture to produce the TAM 252 A 121. Assembled in Slovenia with final assembly in California, the TAM vehicle was to be the first American-market school bus imported from Europe. In comparison to body manufacturers, chassis suppliers saw

10260-416: The segment after 2003. Both Ford and GM continue production today, concentrating on cutaway-van chassis. The beginning of the 21st century would introduce extensive changes to the production of school buses. Though vehicle assembly saw few direct changes, manufacturer consolidation and industry contraction effectively ended the practice of customers selecting body and chassis manufacturers independently. While

10368-576: The shade most commonly associated with school buses both in North America and abroad. During WWII school bus manufacturers converted to military production, manufacturing buses and license-built trucks for the military. Following the war, school bus operation would see a number of changes, following developments within education systems. Following WWII and the rise of suburban growth in North America , demand for school busing increased outside of rural areas; in suburbs and larger urban areas, community design often made walking to school impractical beyond

10476-495: The system to allow for larger injection events. In the later models of B-Series Engine, the fuel system was switched from mechanical injection and timing to mechanical injection with electronic timing. This was all thanks to Bosch's new VP44 radial distributor injection pump. The VP44 injection pump is driven at half the camshaft speed and produces an injection pressure of up to 140 MPa (20,300 lbf/in). The most recent method of fuel injection used in Cummins B Series engines

10584-923: The use of the Dodge Ram Van chassis was phased out. By 2005 the United States government banned the use of 15-passenger vans for student transport, leading to the introduction of Multi-Function School Activity Buses (MFSAB). To better protect passengers, MFSABs share the body structure and compartmentalized seating layout of school buses. Not intended (nor allowed) for uses requiring traffic priority, they are not fitted with school bus warning lights or stop arms (nor are they painted school bus yellow). In 1980, school buses were manufactured by six body manufacturers (Blue Bird, Carpenter, Superior, Thomas, Ward, Wayne) and three chassis manufacturers (Ford, General Motors, and International Harvester); in California, two manufacturers (Crown and Gillig) manufactured transit-style school buses using proprietary chassis (sold primarily across

10692-411: The vanes by sliding a steel ring in the exhaust housing dependent on engine RPM creating more or less pressure inside the exhaust housing and controlling the speed of the turbocharger. It also works as an integrated exhaust brake system and is all controlled by an electronic actuator on the turbocharger. This VGT system has been an extremely common issue with the 6.7 L ISB and is typically diagnosed by

10800-484: The world championship in 1983. The 1986 version of the engine was said to produce about 1,300 hp (969 kW) in qualifying trim. Belgian arms manufacturer FN Herstal , which had been making motorcycles since 1901, began producing the first motorcycles with inline-fours in 1905. The FN Four had its engine mounted upright with the crankshaft longitudinal . Other manufacturers that used this layout included Pierce , Henderson , Ace , Cleveland , and Indian in

10908-410: The world. In North America, school buses are purpose-built vehicles distinguished from other types of buses by design characteristics mandated by federal and state/provincial regulations. In addition to their distinct paint color ( National School Bus Glossy Yellow ), school buses are fitted with exterior warning lights (to give them traffic priority) and multiple safety devices. In the second half of

11016-424: Was different in a few ways from the standard output engine; it had higher compression (17.3:1), powdered metal valve seat inserts, a larger flywheel , the Bosch fuel system was reworked to allow higher fuel flows, and fuel-injection timing was altered. For the 2003 model year, the Cummins was introduced with Bosch high pressure common rail fuel injection, again increasing power output. On automatic equipped vehicles,

11124-437: Was invented in 1911 and consists of two shafts carrying identical eccentric weights that rotate in opposite directions at twice the crankshaft's speed. This system was patented by Mitsubishi Motors in the 1970s and has since been used under licence by several other companies. Not all large displacement straight-four engines have used balance shafts, however. Examples of relatively large engines without balance shafts include

11232-489: Was noticeably quieter than the previous engines. The 6.7 L ISB is the latest version of the B Series. It is currently the largest straight-six engine produced for a light duty truck or school bus . It produces 350 hp (261 kW; 355 PS) and 650 lb⋅ft (881 N⋅m) in the 2007.5 and newer Dodge 2500/3500 pickup trucks with the Chrysler-built six-speed 68RFE automatic transmission built at

11340-570: Was originally designed as a 2 L Formula 2 engine for the Ferrari 500, but evolved to 2.5 L to compete in Formula One in the Ferrari 625. For sports car racing, capacity was increased up to 3.4 L for the Ferrari 860 Monza. The Coventry Climax straight-four engine was also a very successful racing engine, which began life as a 1.5 litre Formula 2 engine. Enlarged to 2.0 litres for Formula One in 1958, it evolved into

11448-478: Was reorganized as Trans Tech . In 2008, Starcraft Bus entered the segment, producing school buses on cutaway chassis (a 2011 prototype using a Hino chassis was never produced). In 2009, Blue Bird and Girardin entered into a joint venture, named Micro Bird; Girardin develops and produces the Blue Bird small-bus product line in Canada. The 2011 founding of Lion Bus marked the return of bus production to Canada (with

11556-553: Was the Bosch P7100 injection pump, this pump is driven off the camshaft gear and drives its own internal camshaft to inject fuel to the individual injectors. This pump itself was one of the most popular options for fueling for the B-Series Engines because of this simplistic design and how reliable it was. The P7100 injection pump also allows for large amounts of fuel to be delivered into the system with simple tweaking to

11664-460: Was used to panel and frame the bus body; wood was relegated to a secondary material. While fitted with a roof, the primary weather protection of the Luce bus design included roll-up canvas side curtains. During the 1930s, school buses saw advances in their design and production that remain in use to this day. To better adapt automotive chassis design, school bus entry doors were moved from the rear to

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