Misplaced Pages

#175824

81-400: Repco is an Australian automotive engineering / retailer company. Its name is an abbreviation of Replacement Parts Company and was for many years known for reconditioning engines and for specialised manufacturing, for which it gained a high reputation. It is now best known as a retailer of spare parts and motor accessories . The company gained fame for developing the engines that powered

162-456: A DOHC configuration gradually increased after World War II, beginning with sports cars. Iconic DOHC engines of this period include the 1948–1959 Lagonda straight-six engine , the 1949–1992 Jaguar XK straight-six engine and the 1954–1994 Alfa Romeo Twin Cam inline-four engine. The 1966-2000 Fiat Twin Cam inline-four engine was one of the first DOHC engines to use a toothed timing belt instead of

243-464: A DOHC engine was built in 1910. Use of DOHC engines slowly increased from the 1940s, leading to many automobiles by the early 2000s using DOHC engines. In an OHC engine, the camshaft is located at the top of the engine, above the combustion chamber . This contrasts the earlier overhead valve engine (OHV) and flathead engine configurations, where the camshaft is located down in the engine block . The valves in both OHC and OHV engines are located above

324-618: A Repco designed block. Brabham scored two poles early in the year, but then the new Ford Cosworth DFV V8 appeared in the Lotus 49 , setting a new pace with its 410 hp (310 kW) at 9,000 rpm, with Jim Clark and Graham Hill taking all poles in the rest of the season. As the Lotus was still fragile, the Brabham drivers scored two wins each. Brabham used new parts on his cars, which was not always helpful, so Denis Hulme collected more results and

405-460: A bore and stroke of 3.50 × 2.375" (88.9 × 60.3 mm). Initially it gave about 285 bhp (213 kW; 289 PS). A test-bed figure of 315 bhp (235 kW; 319 PS) at 7,800 rpm with 230 lb⋅ft (310 N⋅m) torque at 6,500 rpm was obtained. In race trim, about 299 bhp (223 kW; 303 PS) was available. In 1967, the bore and stroke remained unaltered. In that year, 330 bhp (246 kW; 335 PS) bhp at 8,500 rpm

486-477: A car can generate without losing grip, recorded lap-times, cornering speed, brake fade, etc. Performance can also reflect the amount of control in inclement weather (snow, ice, rain). Shift quality : Shift quality is the driver's perception of the vehicle to an automatic transmission shift event. This is influenced by the powertrain ( Internal combustion engine , transmission ), and the vehicle (driveline, suspension , engine and powertrain mounts, etc.) Shift feel

567-608: A fully enclosed-drivetrain), the American Liberty L-12 V12 engine, which closely followed the later Mercedes D.IIIa design's partly-exposed SOHC valvetrain design; and the Max Friz -designed; German BMW IIIa straight-six engine. The DOHC Napier Lion W12 engine was built in Great Britain beginning in 1918. Most of these engines used a shaft to transfer drive from the crankshaft up to the camshaft at

648-518: A head-warping problem on high-compression versions. This meant that Buick heads would fit on Oldsmobile blocks, but not vice versa. Changing the compression ratio on an Oldsmobile 215 required changing the heads, but on a Buick 215, only the pistons, which was less expensive and simpler. General Motors later use of parts diagrams drawn for Oldsmobile in Buick parts catalogue showing a six-stud cylinder block sowed further confusion. Later Rover versions of

729-449: A large cylinder head to accommodate the camshaft or an extra set of valves to increase the volumetric efficiency , so that with the same displacement as an OHV engine, the OHC engine will end up being the physically larger of the two mostly due to the enlarged cylinder head. The other main advantage of OHC engines is that there is greater flexibility to optimise the size, location and shape of

810-407: A total of two camshafts (one for each cylinder bank). Most SOHC engines have two valves per cylinder, one intake valve and one exhaust valve. Motion of the camshaft is usually transferred to the valves either directly (using a tappet) or indirectly via a rocker arm . A dual overhead cam , double overhead cam , or twin-cam engine has two camshafts over each bank of the cylinder head, one for

891-414: A vehicle for its useful life. Tests include mileage accumulation, severe driving conditions, and corrosive salt baths. Drivability : Drivability is the vehicle's response to general driving conditions. Cold starts and stalls, RPM dips, idle response, launch hesitations and stumbles, and performance levels all contribute to the overall drivability of any given vehicle. Cost : The cost of a vehicle program

SECTION 10

#1732781074176

972-515: A vehicle. While sound can be interpreted as a rattle, squeal, or hot, a tactile response can be seat vibration or a buzz in the steering wheel . This feedback is generated by components either rubbing, vibrating, or rotating. NVH response can be classified in various ways: powertrain NVH, road noise, wind noise, component noise, and squeak and rattle. Note, there are both good and bad NVH qualities. The NVH engineer works to either eliminate bad NVH or change

1053-473: Is a branch study of engineering which teaches manufacturing, designing, mechanical mechanisms as well as operations of automobiles. It is an introduction to vehicle engineering which deals with motorcycles, cars, buses, trucks, etc. It includes branch study of mechanical, electronic, software and safety elements. Some of the engineering attributes and disciplines that are of importance to the automotive engineer include: Safety engineering : Safety engineering

1134-403: Is a measurable and testable value of a vehicle's ability to perform in various conditions. Performance can be considered in a wide variety of tasks, but it generally considers how quickly a car can accelerate (e.g. standing start 1/4 mile elapsed time, 0–60 mph, etc.), its top speed, how short and quickly a car can come to a complete stop from a set speed (e.g. 70-0 mph), how much g-force

1215-535: Is also responsible for organizing automobile level testing, validation, and certification. Components and systems are designed and tested individually by the Product Engineer. The final evaluation is to be conducted at the automobile level to evaluate system to system interactions. As an example, the audio system (radio) needs to be evaluated at the automobile level. Interaction with other electronic components can cause interference . Heat dissipation of

1296-527: Is an important factor within the production process, as high quality is needed to meet customer requirements and to avoid expensive recall campaigns . The complexity of components involved in the production process requires a combination of different tools and techniques for quality control. Therefore, the International Automotive Task Force (IATF), a group of the world's leading manufacturers and trade organizations, developed

1377-467: Is both a tactile (felt) and audible (heard) response of the vehicle. Shift quality is experienced as various events: transmission shifts are felt as an upshift at acceleration (1–2), or a downshift maneuver in passing (4–2). Shift engagements of the vehicle are also evaluated, as in Park to Reverse, etc. Durability / corrosion engineering : Durability and corrosion engineering is the evaluation testing of

1458-425: Is located in the cylinder head above the combustion chamber . This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion chamber in the engine block . Single overhead camshaft (SOHC) engines have one camshaft per bank of cylinders . Dual overhead camshaft (DOHC, also known as "twin-cam" ) engines have two camshafts per bank. The first production car to use

1539-431: Is looking for a smaller displacement engine (ex: 1.4 L vs. 5.4 L). The engine size however, is not the only contributing factor to fuel economy and automobile performance. Different values come into play. Other attributes that involve trade-offs include: automobile weight, aerodynamic drag , transmission gearing , emission control devices, handling/roadholding , ride quality , and tires . The development engineer

1620-531: Is possible. The first known automotive application of timing belts to drive overhead camshafts was the 1953 Devin-Panhard racing specials built for the SCCA H-modified racing series in the United States. These engines were based on Panhard OHV flat-twin engines, which were converted to SOHC engines using components from Norton motorcycle engines. The first production car to use a timing belt

1701-457: Is that the system used to drive the camshaft (usually a timing chain in modern engines) is more complex in an OHC engine, such as the 4-chain valvetrain of the Audi 3.2 or the 2 meter chain on Ford cammers. Another disadvantage of OHC engines is that during engine repairs where the removal of the cylinder head is required, the camshaft engine timing needs to be reset. In addition, an OHC engine has

SECTION 20

#1732781074176

1782-551: Is the assessment of various crash scenarios and their impact on the vehicle occupants. These are tested against very stringent governmental regulations. Some of these requirements include: seat belt and air bag functionality testing, front and side-impact testing, and tests of rollover resistance. Assessments are done with various methods and tools, including computer crash simulation (typically finite element analysis ), crash-test dummy , and partial system sled and full vehicle crashes. Fuel economy/emissions : Fuel economy

1863-430: Is the measured fuel efficiency of the vehicle in miles per gallon or kilometers per liter. Emissions -testing covers the measurement of vehicle emissions, including hydrocarbons, nitrogen oxides ( NO x ), carbon monoxide (CO), carbon dioxide (CO 2 ), and evaporative emissions. NVH engineering ( noise, vibration, and harshness ) : NVH involves customer feedback (both tactile [felt] and audible [heard]) concerning

1944-482: Is to adopt the V-Model approach to systems development, as has been widely used in the automotive industry for twenty years or more. In this V-approach, system-level requirements are propagated down the V via subsystems to component design, and the system performance is validated at increasing integration levels. Engineering of mechatronic systems requires the application of two interconnected "V-cycles": one focusing on

2025-407: Is typically split into the effect on the variable cost of the vehicle, and the up-front tooling and fixed costs associated with developing the vehicle. There are also costs associated with warranty reductions and marketing. Program timing : To some extent programs are timed with respect to the market, and also to the production-schedules of assembly plants. Any new part in the design must support

2106-560: The 5.0 L Chevrolet V8. Due to the success of the Repco-Holden V8, Holden enlisted Repco to carry out the development work (on the dynamometer only, according to Holden Dealer Team boss Harry Firth ) on Holden's 308 engine for its Torana SL/R 5000 that was released in 1974. Firth believed that developing the engine on the dyno and not on the race track saw continual problems for the engine such as oil surge—especially in touring car racing. He also claimed to have already cured

2187-576: The Brabham Formula One cars in which Jack Brabham and Denny Hulme won the 1966 and 1967 World Championship of Drivers titles. Brabham-Repco was awarded the International Cup for F1 Manufacturers in the same two years. Repco currently runs a series of stores across Australia and New Zealand specialising in the sale of parts and aftermarket accessories. Repco was founded by Geoff Russell in 1922 and first traded under

2268-551: The Duesenberg Model J , which was powered by a DOHC straight-eight engine. The 1931–1935 Stutz DV32 was another early American luxury car to use a DOHC engine. Also in the United States, the DOHC Offenhauser racing engine was introduced in 1933. This inline-four engine dominated North American open-wheel racing from 1934 until the 1970s. Other early SOHC automotive engines were the 1920–1923 Wolseley Ten ,

2349-508: The Formula One category would be doubled to three litres to start from the 1966 season . Despite calls for a "return to power" having been made, few teams were prepared as the main engine supplier in the UK, Coventry Climax , decided to get out of race engine building. Jack Brabham used his friendship with engineer Phil Irving at Repco. He proposed they design and build a 3 L version of

2430-525: The SOHC design on Oldsmobile Jetfire 215 ci block with six cylinder-head studs per cylinder. Combined with a short stroke flat-plane crankshaft, Repco designed cylinder heads, camshafts and two-stage chain/gear cam drive, a 2.5 L engine was built in 1965 with its cylinder head cast by Commonwealth Aircraft . In 1963 the international motor racing body, the FIA , announced that the maximum engine capacity for

2511-537: The South African Grand Prix in the late 1960s, as well as in the national F1 series there. Repco had been involved in Australian motor racing many years prior to the association with Brabham. Most famous had been development of the engine of the series of Maybach Specials in the 1950s to various wins including the 1954 New Zealand Grand Prix . The Brabham-Repco project was initially aimed at

Repco - Misplaced Pages Continue

2592-803: The Tasman Series , the Australian Drivers' Championship , the Australian Sports Car Championship and the Australian Sports Sedan Championship . By 1976, power for the 5.0 L Repco-Holden V8 was rated at approximately 500 bhp (373 kW; 507 PS). This compared to approximately 520 bhp (388 kW; 527 PS) for the other main engine in the Australian Formula 5000 and Sports Sedans categories,

2673-714: The Tasman Series , where Coventry-Climax 's obsolete FPF four-cylinder engine was dominant in the mid-1960s. The 2.5-litre version of the Repco V8 was never very successful in this series, initially producing no more power than the FPF. It did, however, record one Tasman Series round win with Jack Brabham driving his Repco powered Brabham BT23A to victory in the 1967 South Pacific Trophy at the Longford Circuit in Tasmania . Brabham-Repco's were also prepared and entered in

2754-595: The efficiency of the automotive plant and to implement lean manufacturing techniques such as Six Sigma and Kaizen . Other automotive engineers include those listed below: Studies indicate that a substantial part of the modern vehicle's value comes from intelligent systems, and that these represent most of the current automotive innovation. To facilitate this, the modern automotive engineering process has to handle an increased use of mechatronics . Configuration and performance optimization, system integration, control, component, subsystem and system-level validation of

2835-624: The "bad NVH" to good (i.e., exhaust tones). Vehicle electronics : Automotive electronics is an increasingly important aspect of automotive engineering. Modern vehicles employ dozens of electronic systems. These systems are responsible for operational controls such as the throttle, brake and steering controls; as well as many comfort-and-convenience systems such as the HVAC , infotainment , and lighting systems. It would not be possible for automobiles to meet modern safety and fuel-economy requirements without electronic controls. Performance : Performance

2916-537: The 1903 Marr Auto Car SOHC engine built in the United States. The first DOHC engine was a Peugeot inline-four racing engine which powered the car that won the 1912 French Grand Prix . Another Peugeot with a DOHC engine won the 1913 French Grand Prix , followed by the Mercedes-Benz 18/100 GP with an SOHC engine winning the 1914 French Grand Prix . The Isotta Fraschini Tipo KM — built in Italy from 1910–1914—

2997-427: The 1925-1948 Velocette K series , the 1931-1957 Norton International and the 1947-1962 Norton Manx . In more recent times, the 1950-1974 Ducati Single , 1973-1980 Ducati L-twin engine , 1999-2007 Kawasaki W650 and 2011-2016 Kawasaki W800 motorcycle engines have used bevel shafts. The Crosley four cylinder was the last automotive engine to use the shaft tower design to drive the camshaft, from 1946 to 1952;

3078-417: The 1928-1931 MG 18/80 , the 1926–1935 Singer Junior and the 1928–1929 Alfa Romeo 6C Sport . Early overhead camshaft motorcycles included the 1925–1949 Velocette K Series and the 1927–1939 Norton CS1 . The 1946–1948 Crosley CC Four was arguably the first American mass-produced car to use an SOHC engine. This small mass-production engine powered the winner of the 1950 12 Hours of Sebring . Use of

3159-461: The 1968 and 1969 Indianapolis 500 . In 1969, Peter Revson finished fifth in such a car. He also won a USAC race in the same year. Further versions of the V8 engine were produced, including a 4.3-litre variant for sports car racing and a turbo-charged version intended for United States Automobile Club races. Neither version met with any international success, the turbo in particular being labelled 'Puff

3240-474: The 2.5 L engine by using a longer stroke flat-plane crankshaft. The Repco board agreed to his proposal in light of the expected rival 2.75 L Coventry Climax FPF DOHC engine being of four-cylinder configuration deemed to be near-obsolete, and the plan to build the Cosworth DFV (revealed at the end of 1965 by Ford , its sponsor) was not known yet. A small team at Repco under Phil Irving developed

3321-525: The F1 engine, fitted with two valves per cylinder SOHC heads from the 2.5L version. The first advantage of this Repco 620 V8 was its compact size and lightness, which allowed it to be bolted into an existing 1.5-litre Formula One chassis. With no more than 310 bhp (231 kW), the Repco was by far the least powerful of the new 3-litre engines, but unlike the others it was frugal, light and compact. Also unlike

Repco - Misplaced Pages Continue

3402-940: The Tragic Wagon' by its development team due to its lack of horsepower (compared with " Puff, the Magic Dragon "). The sports car engine (increased in size to 5.0 litres) was, however, dominant domestically, powering cars to several wins in the Australian Sports Car Championship and its predecessor the Australian Tourist Trophy , most notably powering the Matich sports cars built and raced by Frank Matich , and Elfin Sports Cars built and raced by Garrie Cooper . When Jack Brabham began building racing cars in England he named his cars Repco Brabhams,

3483-399: The aluminum block and subsequent Buick iron small blocks went to a 4-bolt-per-cylinder pattern. In 1966, the Repco engine was good enough to score three poles for Jack Brabham. In his one-off BT19 , it helped him get four consecutive wins and both titles in the nine-race-long season, a unique accomplishment for a driver and constructor. This was his third title. The 2,995.58 cc V8 Repco had

3564-460: The automobile attributes at a certain acceptable level. An example of this is the trade-off between engine performance and fuel economy . While some customers are looking for maximum power from their engine , the automobile is still required to deliver an acceptable level of fuel economy. From the engine's perspective, these are opposing requirements. Engine performance is looking for maximum displacement (bigger, more power), while fuel economy

3645-475: The automotive world is crucial to make certain whichever design is developed in the Research and Development Stage of automotive design . Once the design is established, the manufacturing engineers take over. They design the machinery and tooling necessary to build the automotive components or vehicle and establish the methods of how to mass-produce the product. It is the manufacturing engineers job to increase

3726-503: The block and head castings of the Holden 308 V8 engine as its basis, but it featured many modifications including Lucas fuel injection, dual-coil Bosch ignition and more than 150 special components designed by Repco. The engine first tasted success in the 1970 Australian Grand Prix that was won by Frank Matich driving a Repco-Holden powered McLaren M10B . The engine was then used extensively in racing vehicles including cars competing in

3807-519: The block, and were known as "tower shafts". An early American overhead camshaft production engine was the SOHC straight-eight engine used in the 1921–1926 Duesenberg Model A luxury car. In 1926, the Sunbeam 3 litre Super Sports became the first production car to use a DOHC engine. In the United States, Duesenberg added DOHC engines (alongside their existing SOHC engines) with the 1928 release of

3888-415: The camshaft. Timing belts are inexpensive, produce minimal noise and have no need for lubrication. A disadvantage of timing belts is the need for regular replacement of the belt; recommended belt life typically varies between approximately 50,000–100,000 km (31,000–62,000 mi). If the timing belt is not replaced in time and fails and the engine is an interference engine , major engine damage

3969-470: The combustion chamber; however an OHV engine requires pushrods and rocker arms to transfer the motion from the camshaft up to the valves, whereas an OHC engine has the valves directly actuated by the camshaft. Compared with OHV engines with the same number of valves, there are fewer reciprocating components and less valvetrain inertia in an OHC engine. This reduced inertia in OHC engines results in less valve float at higher engine speeds (RPM). A downside

4050-477: The complete automobile. As an example, the brake system's main function is to provide braking functionality to the automobile. Along with this, it must also provide an acceptable level of: pedal feel (spongy, stiff), brake system "noise" (squeal, shudder, etc.), and interaction with the ABS (anti-lock braking system) Another aspect of the development engineer's job is a trade-off process required to deliver all of

4131-466: The crankshaft and the camshaft is commonly used in diesel overhead camshaft engines used in heavy trucks. Gear trains are not commonly used in engines for light trucks or automobiles. Several OHC engines up until the 1950s used a shaft with bevel gears to drive the camshaft. Examples include the 1908–1911 Maudslay 25/30 , the Bentley 3 Litre , the 1917-? Liberty L-12 , the 1929-1932 MG Midget ,

SECTION 50

#1732781074176

4212-457: The development and manufacturing schedule of the model. Assembly feasibility : It is easy to design a module that is hard to assemble, either resulting in damaged units or poor tolerances. The skilled product-development engineer works with the assembly/manufacturing engineers so that the resulting design is easy and cheap to make and assemble, as well as delivering appropriate functionality and appearance. Quality management : Quality control

4293-432: The intake and exhaust ports, since there are no pushrods that need to be avoided. This improves the gas flow through the engine, increasing power output and fuel efficiency . The oldest configuration of overhead camshaft engine is the single overhead camshaft (SOHC) design. A SOHC engine has one camshaft per bank of cylinders, therefore a straight engine has a total of one camshaft and a V engine or flat engine has

4374-715: The intake valves and another for the exhaust valves. Therefore there are two camshafts for a straight engine and a total of four camshafts for a V engine or a flat engine. A V engine or flat engine requires four camshafts to function as a DOHC engine, since having two camshafts in total would result in only a single camshaft per cylinder bank for these engine layouts. Some V engines with four camshafts have been marketed as "quad-cam" engines, however technically "quad-cam" would require four camshafts per cylinder bank (i.e. eight camshafts in total), therefore these engines are merely dual overhead camshaft engines. Many DOHC engines have four valves per cylinder. The camshaft usually operates

4455-422: The intelligent systems must become an intrinsic part of the standard vehicle engineering process, just as this is the case for the structural, vibro-acoustic and kinematic design. This requires a vehicle development process that is typically highly simulation-driven. One way to effectively deal with the inherent multi-physics and the control systems development that is involved when including intelligent systems,

4536-410: The multi-physics system engineering (like the mechanical and electrical components of an electrically powered steering system, including sensors and actuators); and the other focuses on the controls engineering, the control logic, the software and realization of the control hardware and embedded software. SOHC An overhead camshaft ( OHC ) engine is a piston engine in which the camshaft

4617-730: The name Automotive Grinding Company, from premises in Collingwood, Victoria . Repco was listed on the Australian Securities Exchange (ASX) in 1937. It was acquired by Pacific Dunlop in 1988 and delisted . In September 2001 Repco was purchased by a private equity consortium, before again becoming a listed company, this time as a dual listed company on the ASX and New Zealand Exchange . Following acquisition of all shares by CCMP Capital in December 2006, Repco

4698-605: The oil problems while developing the still-born Torana GTR XU-1 V8 in 1972 and that Holden ignored his warnings about the Repco engine. The list of Repco-Holden's Formula 5000 engine race, championship and series wins includes: Australian Grand Prix Australian Drivers' Championship New Zealand Grand Prix Australian Sports Car Championship Australian Sports Sedan Championship Australian Tourist Trophy Toby Lee Series ( key ) (results in bold indicate pole position) (results in italics indicate fastest lap) Automotive engineering Automobile engineering

4779-423: The others, it was reliable and due to low weight and power, the strain on chassis, suspension, brakes and tyres was low. This engine being based on British/American Rover V8 / Buick 215 block is a common misconception. The Oldsmobile version of this engine, although sharing the same basic architecture, had cylinder heads and angled valve covers designed by Oldsmobile engineers to look like a traditional Olds V8 and

4860-421: The project. For 1969, the works Brabham team and most of the private Brabham entries also used the ubiquitous Cosworth powerplant. A pair of older Brabham-Repcos were entered in the season opening 1969 South African Grand Prix by local drivers Sam Tingle and Peter de Klerk , but no points were scored on the engine marque's last appearance in the world championship. Also, LDS fitted with Repcos were used in

4941-414: The quality discipline functional safety according to ISO/IEC 17025 is applied. Since the 1950s, the comprehensive business approach total quality management (TQM) has operated to continuously improve the production process of automotive products and components. Some of the companies who have implemented TQM include Ford Motor Company , Motorola and Toyota Motor Company . A development engineer has

SECTION 60

#1732781074176

5022-601: The responsibility for coordinating delivery of the engineering attributes of a complete automobile ( bus , car , truck , van, SUV, motorcycle etc.) as dictated by the automobile manufacturer , governmental regulations , and the customer who buys the product. Much like the Systems engineer , the development engineer is concerned with the interactions of all systems in the complete automobile. While there are multiple components and systems in an automobile that have to function as designed, they must also work in harmony with

5103-493: The result of a sponsorship deal between Brabham and Repco. This name was applied regardless of the engine used, and the arrangement existed through to the end of the 1960s. The agreement saw Repco's international marketing of its automotive parts and service equipment supported by Brabham's racing achievements. Repco also developed and built the Repco-Holden Formula 5000 engine for Formula 5000 racing. Repco used

5184-454: The rights to the Crosley engine format were bought by a few different companies, including General Tire in 1952, followed by Fageol in 1955, Crofton in 1959, Homelite in 1961, and Fisher Pierce in 1966, after Crosley closed the automotive factory doors, and they continued to produce the same engine for several more years. A camshaft drive using three sets of cranks and rods in parallel

5265-404: The safe and effective production of the vehicle. This group of engineers consist of process engineers , logistic coordinators , tooling engineers , robotics engineers, and assembly planners. In the automotive industry manufacturers are playing a larger role in the development stages of automotive components to ensure that the products are easy to manufacture. Design for manufacturability in

5346-470: The standard ISO/TS 16949 . This standard defines the design, development, production, and (when relevant) installation and service requirements. Furthermore, it combines the principles of ISO 9001 with aspects of various regional and national automotive standards such as AVSQ (Italy), EAQF (France), VDA6 (Germany) and QS-9000 (USA). In order to further minimize risks related to product failures and liability claims for automotive electric and electronic systems,

5427-675: The starting point for both Mercedes' and Rolls-Royce's aircraft engines. Mercedes created a series of six-cylinder engines which culminated in the Mercedes D.III . Rolls-Royce reversed-engineered the Mercedes cylinder head design based on a racing car left in England at the beginning of the war, leading to the Rolls-Royce Eagle V12 engine. Other SOHC designs included the Spanish Hispano-Suiza 8 V8 engine (with

5508-410: The system and ergonomic placement of the controls need to be evaluated. Sound quality in all seating positions needs to be provided at acceptable levels. Manufacturing engineers are responsible for ensuring proper production of the automotive components or complete vehicles. While the development engineers are responsible for the function of the vehicle, manufacturing engineers are responsible for

5589-447: The timing between each camshaft and the crankshaft. This affords better fuel economy by allowing a broader torque curve. Although each major manufacturer has their own trade name for their specific system of variable cam phasing systems, overall they are all classified as variable valve timing . The rotation of a camshaft is driven by a crankshaft . Many 21st century engines use a toothed timing belt made from rubber and kevlar to drive

5670-649: The title sponsor of the D1NZ National Drifting Championship, a sanctioned championship under Motorsport New Zealand, the official FIA appointed governing body of motor-racing in New Zealand. In 1964 the Australian/New Zealand Tasman Series was created with a 2,500 cc capacity limit applied to engines. Jack Brabham approached Repco to develop a suitable engine, and together they decided to base

5751-467: The title, followed by Brabham himself, who again won the constructors' title. The new Ford engine, which was made available to other teams in 1968 also, convinced Brabham that more power was needed. With hindsight Brabham commented that the single cam motor's reliability may have been enough to supplant the more powerful Cosworths as late as the 1968 season. A new version of the Repco V8, with gear-driven double-overhead camshafts and four valves per cylinder,

5832-437: The top of the engine. Large aircraft engines— particularly air-cooled engines— experienced considerable thermal expansion, causing the height of the cylinder block to vary during operating conditions. This expansion caused difficulties for pushrod engines, so an overhead camshaft engine using a shaft drive with sliding spline was the easiest way to allow for this expansion. These bevel shafts were usually in an external tube outside

5913-414: The valves directly via a bucket tappet . A DOHC design permits a wider angle between intake and exhaust valves than in SOHC engines, which improves the air-fuel mixture's flow through the engine. A further benefit is that the spark plug can be placed at the optimum location, which in turn improves combustion efficiency . Another newer benefit of DOHC engine design is the ability to independently change/phase

5994-403: The wrong time, managed to score two poles and two podiums that year, while Brabham himself collected only two points. The Repco project had always been hindered by the lengthy lines of communication between the UK and Australia, which made correcting problems very difficult. Repco, having spent far more money than originally envisaged and having sold very few customer versions of its engine, stopped

6075-476: Was again delisted. On 1 July 2013, Repco and the entire Exego group (consisting of Ashdown-Ingram, Mcleod Accessories and Motospecs) were acquired by Genuine Parts Company . Since 2021 , the company has held the naming rights to the Bathurst 1000 and Supercars Championship . It previously sponsored Garry Rogers Motorsport and Dick Johnson Racing and the 1979 Round Australia Trial . In 2024, Repco became

6156-403: Was often quoted. A test-bed figure of 327 bhp (244 kW; 332 PS) at 8,300 rpm was recorded. For 1968, a 32-valve version with 400 bhp (298 kW; 406 PS) at 9,500 rpm was planned. Only about 380 bhp (283 kW; 385 PS) at 9,000 rpm was achieved. In 1967 the competition had made progress. Repco produced a new version of the engine, the 700 series, this time with

6237-520: Was one of the first production cars to use an SOHC engine. During World War I, both the Allied and Central Powers ; specifically those of the German Empire 's Luftstreitkräfte air forces, sought to quickly apply the overhead camshaft technology of motor racing engines to military aircraft engines. The SOHC engine from the Mercedes 18/100 GP car (which won the 1914 French Grand Prix) became

6318-487: Was produced for 1968 to maintain its competitiveness. A figure of 400 bhp (298 kW; 406 PS) at 9,500 rpm was targeted but only about 380 bhp (283 kW; 385 PS) at 9,000 rpm was achieved. The season was a disaster as it proved very unreliable due to insurmountable valve gear unreliability. There was also a 4.2-litre derivative for the Indianapolis 500 . Jochen Rindt , who had moved to Brabham at

6399-471: Was produced on a separate assembly line. Oldsmobile 's intention to produce a higher-powered, turbo-charged Jetfire version led to significant differences from the Buick 215, primarily in cylinder head design: Buick used a 5-bolt pattern around each cylinder where Oldsmobile used a 6-bolt pattern. The sixth bolt was added to the intake manifold side of the head, one extra bolt for each cylinder, meant to alleviate

6480-472: Was the 1962 Glas 1004 compact coupe. Another camshaft drive method commonly used on modern engines is a timing chain , constructed from one or two rows of metal roller chains . By the early 1960s most production automobile overhead camshaft designs used chains to drive the camshaft(s). Timing chains do not usually require replacement at regular intervals, however the disadvantage is that they are noisier than timing belts. A gear train system between

6561-474: Was used in the 1920–1923 Leyland Eight luxury car built in the United Kingdom. A similar system was used in the 1926-1930 Bentley Speed Six and the 1930-1932 Bentley 8 Litre . A two-rod system with counterweights at both ends was used by many models of the 1958-1973 NSU Prinz . Among the first overhead camshaft engines were the 1902 Maudslay SOHC engine built in the United Kingdom and

#175824