64-546: A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). It first appeared on the Yamaha FZR EXUP and was later used on many other Yamahas. Later versions from Honda went by
128-447: A flathead engine a push rod is not necessary. The overhead cam design typically allows higher engine speeds because it provides the most direct path between cam and valve. Valve clearance refers to the small gap between a valve lifter and a valve stem that ensures that the valve completely closes. On engines with mechanical valve adjustment, excessive clearance causes noise from the valve train. A too-small valve clearance can result in
192-543: A 264-cubic-centimetre (16.1 cu in) single-cylinder Otto cycle four-stroke engine mounted on rubber blocks, with two iron tread wooden wheels and a pair of spring-loaded outrigger wheels to help it remain upright. Its engine output of 0.37 kW (0.5 hp) at 600 rpm gave it a speed of about 11 km/h (6.8 mph). Daimler's 17-year-old son, Paul, rode it first on November 18, 1885, going 5–12 kilometres (3.1–7.5 mi), from Cannstatt to Untertürkheim, Germany. The seat caught fire on that excursion,
256-488: A few sources as the first gasoline internal combustion motorcycle, and in fact the first ever internal combustion vehicle , so Bernardi mounted his engine on the bicycle of his son, while Dailmer designed and built the Reitwagen chassis to fit the needs of his machine and so the first all around motorbike. The Motrice Pia is not mentioned in any mainstream sources. While there is some discussion in mainstream sources of
320-418: A float metered carburetor , used mushroom intake valves which were opened by the suction of the piston's intake stroke, and instead of an electrical ignition system , it used hot tube ignition , a platinum tube running into the combustion chamber, heated by an external open flame. It could also run on coal gas . It used twin flywheels and had an aluminum crankcase . Daimler's and Maybach's next step
384-434: A horizontal cylinder engine that ran on petroleum naptha . The Otto engines were incapable of running at speeds much higher than 150 to 200 rpm and were not designed to be throttled. Daimler's goal was to build an engine small enough that it could be used to power a wide range of transportation equipment with a minimum rotation speed of 600 rpm. This was realized with the 1883 engine. The next year Daimler and Maybach developed
448-493: A replica of the Lenoir engine in 1861, Otto became aware of the effects of compression on the fuel charge. In 1862, Otto attempted to produce an engine to improve on the poor efficiency and reliability of the Lenoir engine. He tried to create an engine that would compress the fuel mixture prior to ignition, but failed as that engine would run no more than a few minutes prior to its destruction. Many other engineers were trying to solve
512-583: A turbine system that converted waste heat into kinetic energy that it fed back into the engine's transmission. In 2005, BMW announced the development of the turbosteamer , a two-stage heat-recovery system similar to the Mack system that recovers 80% of the energy in the exhaust gas and raises the efficiency of an Otto engine by 15%. By contrast, a six-stroke engine may reduce fuel consumption by as much as 40%. Modern engines are often intentionally built to be slightly less efficient than they could otherwise be. This
576-528: A vehicle that was created along the way to Daimler's real goal, a four-wheeled car, and earning him credit as the inventor of the motorcycle " malgré lui ," in spite of himself. Daimler had founded an experimental workshop in the garden shed behind his house in Cannstatt near Stuttgart in 1882. Together with his employee Maybach they developed a compact, high-speed single-cylinder engine, patented on April 3, 1885, and called "grandfather clock engine." It had
640-592: A vertical cylinder model which is called the Grandfather Clock engine and achieved 700 rpm and soon 900 rpm was achieved. This was made possible by the Hot-Tube ignition which was developed by an Englishman named Watson. The electrical systems of that era were unreliable and too slow to allow those speeds. Having achieved the goals of producing a throttling engine with high enough RPM that was small enough to be used in transportation Daimler and Maybach built
704-413: Is a contact surface on which the cam slides to open the valve. Many engines use one or more camshafts "above" a row (or each row) of cylinders, as in the illustration, in which each cam directly actuates a valve through a flat tappet. In other engine designs the camshaft is in the crankcase , in which case each cam usually contacts a push rod , which contacts a rocker arm that opens a valve, or in case of
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#1732802133328768-480: Is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed: Four-stroke engines are the most common internal combustion engine design for motorized land transport, being used in automobiles , trucks , diesel trains , light aircraft and motorcycles . The major alternative design
832-403: Is closed, and to increase low-speed torque, large-amplitude exhaust pressure waves are artificially induced. This is done by partial closing of an internal butterfly valve within the exhaust where the primary pipes from the cylinders join. The alteration of the pressure at this point controls the behavior of reflected waves at this sudden increase in area discontinuity. Closing the valve increases
896-467: Is closer to the top. Diesel engines by their nature do not have concerns with pre-ignition. They have a concern with whether or not combustion can be started. The description of how likely Diesel fuel is to ignite is called the Cetane rating. Because Diesel fuels are of low volatility, they can be very hard to start when cold. Various techniques are used to start a cold Diesel engine, the most common being
960-424: Is designed to provide efficiency at the expense of power density , and is used in some modern hybrid electric applications. The original Atkinson-cycle piston engine allowed the intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft and was designed to avoid infringing certain patents covering Otto-cycle engines. Due to the unique crankshaft design of
1024-536: Is limited by the chemical composition of the fuel. There are several grades of fuel to accommodate differing performance levels of engines. The fuel is altered to change its self ignition temperature. There are several ways to do this. As engines are designed with higher compression ratios the result is that pre-ignition is much more likely to occur since the fuel mixture is compressed to a higher temperature prior to deliberate ignition. The higher temperature more effectively evaporates fuels such as gasoline, which increases
1088-609: Is necessary for emission controls such as exhaust gas recirculation and catalytic converters that reduce smog and other atmospheric pollutants. Reductions in efficiency may be counteracted with an engine control unit using lean burn techniques . In the United States, the Corporate Average Fuel Economy mandates that vehicles must achieve an average of 34.9 mpg ‑US (6.7 L/100 km; 41.9 mpg ‑imp ) compared to
1152-431: Is not immediately available due to the need to sharply increase engine RPM, to build up pressure and to spin up the turbo, before the turbo starts to do any useful air compression. The increased intake volume causes increased exhaust and spins the turbo faster, and so forth until steady high power operation is reached. Another difficulty is that the higher exhaust pressure causes the exhaust gas to transfer more of its heat to
1216-414: Is regarded as the first car. In 1884, Otto's company, then known as Gasmotorenfabrik Deutz (GFD), developed electric ignition and the carburetor. In 1890, Daimler and Maybach formed a company known as Daimler Motoren Gesellschaft . Today, that company is Daimler-Benz . The Atkinson-cycle engine is a type of single stroke internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle
1280-400: Is that the temperature rise of the compressed charge can cause pre-ignition. If this occurs at the wrong time and is too energetic, it can damage the engine. Different fractions of petroleum have widely varying flash points (the temperatures at which the fuel may self-ignite). This must be taken into account in engine and fuel design. The tendency for the compressed fuel mixture to ignite early
1344-581: Is the two-stroke cycle . Nikolaus August Otto was a traveling salesman for a grocery concern. In his travels, he encountered the internal combustion engine built in Paris by Belgian expatriate Jean Joseph Etienne Lenoir . In 1860, Lenoir successfully created a double-acting engine that ran on illuminating gas at 4% efficiency. The 18 litre Lenoir Engine produced only 2 horsepower. The Lenoir engine ran on illuminating gas made from coal, which had been developed in Paris by Philip Lebon . In testing
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#17328021333281408-412: Is ultimately limited by material strength and lubrication . Valves, pistons and connecting rods suffer severe acceleration forces. At high engine speed, physical breakage and piston ring flutter can occur, resulting in power loss or even engine destruction. Piston ring flutter occurs when the rings oscillate vertically within the piston grooves they reside in. Ring flutter compromises the seal between
1472-1396: The Cannstatt Fire that razed the Daimler-Motoren-Gesellschaft Seelberg-Cannstatt plant in 1903, but several replicas exist in collections at the Mercedes-Benz Museum in Stuttgart, the Deutsches Museum in Munich, the Honda Collection Hall at the Twin Ring Motegi facility in Japan, the AMA Motorcycle Hall of Fame in Ohio, the Deeley Motorcycle Exhibition in Vancouver, Canada, and in Melbourne , Australia. The Deutsches Museum lent their replica to
1536-687: The Guggenheim Las Vegas The Art of the Motorcycle exhibition in 2001. The replicas vary as to which version they follow. The one at the AMA Hall of Fame is larger than the original and uses the complex belt tensioner and steering linkage seen in the 1884 plans, while the Deutsches Museum's replica has the simple handlebar, as well as the ring gear on the rear wheel. KTM have borrowed the replica Reitwagen from
1600-487: The Miller cycle . Together, this redesign could significantly reduce fuel consumption and NO x emissions. [REDACTED] [REDACTED] [REDACTED] Starting position, intake stroke, and compression stroke. [REDACTED] [REDACTED] [REDACTED] Ignition of fuel, power stroke, and exhaust stroke. Daimler Reitwagen The Daimler Reitwagen ("riding car") or Einspur ("single track")
1664-590: The fuel economy improvements the Atkinson cycle can provide. The diesel engine is a technical refinement of the 1876 Otto-cycle engine. Where Otto had realized in 1861 that the efficiency of the engine could be increased by first compressing the fuel mixture prior to its ignition, Rudolf Diesel wanted to develop a more efficient type of engine that could run on much heavier fuel. The Lenoir , Otto Atmospheric, and Otto Compression engines (both 1861 and 1876) were designed to run on Illuminating Gas (coal gas) . With
1728-535: The 1884 engine into a two-wheeled test frame which was patented as the "Petroleum Reitwagen" (Petroleum Riding Car). This test machine demonstrated the feasibility of a liquid petroleum engine which used a compressed fuel charge to power an automobile. Daimler is often referred to as the Father of the Automobile. "The first motorcycle looks like an instrument of torture", wrote Melissa Holbrook Pierson , describing
1792-433: The Atkinson, its expansion ratio can differ from its compression ratio and, with a power stroke longer than its compression stroke, the engine can achieve greater thermal efficiency than a traditional piston engine. While Atkinson's original design is no more than a historical curiosity, many modern engines use unconventional valve timing to produce the effect of a shorter compression stroke/longer power stroke, thus realizing
1856-525: The actual four-stroke and two-stroke cycles is not a simple task. However, the analysis can be simplified significantly if air standard assumptions are utilized. The resulting cycle, which closely resembles the actual operating conditions, is the Otto cycle. During normal operation of the engine, as the air/fuel mixture is being compressed, an electric spark is created to ignite the mixture. At low rpm this occurs close to TDC (Top Dead Centre). As engine rpm rises,
1920-426: The air has been compressed twice and then gains more potential volume in the combustion but it is only expanded in one stage. A turbocharger is a supercharger that is driven by the engine's exhaust gases, by means of a turbine . A turbocharger is incorporated into the exhaust system of a vehicle to make use of the expelled exhaust. It consists of a two piece, high-speed turbine assembly with one side that compresses
1984-452: The bore diameter is larger than its stroke length is an oversquare engine, conversely, an engine with a bore diameter that is smaller than its stroke length is an undersquare engine. The valves are typically operated by a camshaft rotating at half the speed of the crankshaft . It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke. A tappet between valve and cam
Four-stroke power valve system - Misplaced Pages Continue
2048-436: The current standard of 25 mpg ‑US (9.4 L/100 km; 30.0 mpg ‑imp ). As automakers look to meet these standards by 2016, new ways of engineering the traditional internal combustion engine (ICE) have to be considered. Some potential solutions to increase fuel efficiency to meet new mandates include firing after the piston is farthest from the crankshaft, known as top dead centre , and applying
2112-411: The director of N.A. Otto & Cie the world's largest engine manufacturer. Otto's company had created the first successful gaseous fuel engine in 1864 and in 1876 finally succeeded in creating a compressed charge gaseous petroleum engine due to the direction of Daimler and his plant engineer Wilhelm Maybach. Because of this success Otto's company name was changed to Gasmotoren Fabrik Deutz (Now Deutz AG)
2176-417: The drive belt, applying power to the wheel, when turned the other way. Roper's velocipede of the late 1860s used a similar two way twistgrip handlebar control. The plans also called for steering linkage shafts that made two right angle bends connected with gears, but the actual working model used a simple handlebar without the twist grip or gear linkage. The design was patented on August 29, 1885. It had
2240-474: The efficiency of the compression engine. Higher compression ratios also mean that the distance that the piston can push to produce power is greater (which is called the expansion ratio ). The octane rating of a given fuel is a measure of the fuel's resistance to self-ignition. A fuel with a higher numerical octane rating allows for a higher compression ratio, which extracts more energy from the fuel and more effectively converts that energy into useful work while at
2304-502: The energy generated by combustion is converted into useful rotational energy at the output shaft of the engine, while the remainder being lost due to waste heat, friction and engine accessories. There are a number of ways to recover some of the energy lost to waste heat. The use of a turbocharger in diesel engines is very effective by boosting incoming air pressure and in effect, provides the same increase in performance as having more displacement. The Mack Truck company, decades ago, developed
2368-414: The engine's hot tube ignition being located directly underneath. Over the winter of 1885–1886 the belt drive was upgraded to a two-stage, two-speed transmission with a belt primary drive and the final drive using a ring gear on the back wheel. By 1886 the Reitwagen had served its purpose and was abandoned in favor of further development on four wheeled vehicles. The original Reitwagen was destroyed in
2432-412: The engine's performance and/or fuel efficiency could be improved by improving the overall efficiency of the cycle. It has been found that even if 6% of the entirely wasted heat is recovered it can increase the engine efficiency greatly. Many methods have been devised in order to extract waste heat out of an engine exhaust and use it further to extract some useful work, decreasing the exhaust pollutants at
2496-560: The engines burst, nearly killing Diesel. He persisted, and finally created a successful engine in 1893. The high-compression engine, which ignites its fuel by the heat of compression, is now called the diesel engine, whether a four-stroke or two-stroke design. The four-stroke diesel engine has been used in the majority of heavy-duty applications for many decades. It uses a heavy fuel containing more energy and requiring less refinement to produce. The most efficient Otto-cycle engines run near 30% thermal efficiency. The thermodynamic analysis of
2560-454: The first gasoline internal combustion motorcycle, and the forerunner of all vehicles, land, sea and air, that use its overwhelmingly popular engine type. The Reitwagen ' s status as the first motorcycle rests on whether the definition of motorcycle includes having an internal combustion engine. The Oxford English Dictionary uses this criterion. Even by that definition, the use of four wheels instead of two raises doubts. If
2624-420: The first high-speed Otto engine in 1883. In 1885, they produced the first automobile to be equipped with an Otto engine. The Daimler Reitwagen used a hot-tube ignition system and the fuel known as Ligroin to become the world's first vehicle powered by an internal combustion engine. It used a four-stroke engine based on Otto's design. The following year, Karl Benz produced a four-stroke engined automobile that
Four-stroke power valve system - Misplaced Pages Continue
2688-434: The intake air, and the other side that is powered by the exhaust gas outflow. When idling, and at low-to-moderate speeds, the turbine produces little power from the small exhaust volume, the turbocharger has little effect and the engine operates nearly in a naturally aspirated manner. When much more power output is required, the engine speed and throttle opening are increased until the exhaust gases are sufficient to 'spool up'
2752-549: The local pressure, inducing the formation of larger-amplitude negative reflected expansion waves. A servo motor controlled by the ECU opens and shuts the valve. The valve goes from being almost fully closed at idle speed, through to fully open at higher engine speeds. This ensures low to mid-range performance, more linear power output and reduced exhaust noise levels while the valve is in its reduced opening position. Four-stroke engine A four-stroke (also four-cycle ) engine
2816-424: The mechanical parts of the engine. The rod-to-stroke ratio is the ratio of the length of the connecting rod to the length of the piston stroke. A longer rod reduces sidewise pressure of the piston on the cylinder wall and the stress forces, increasing engine life. It also increases the cost and engine height and weight. A "square engine" is an engine with a bore diameter equal to its stroke length. An engine where
2880-521: The merits of Michaux-Perreaux steam velocipede or Roper steam velocipede versus the Reitwagen , there is no debate that considers the merits of the Motrice Pia . Gottlieb Daimler visited Paris in 1861 and spent time observing the first internal combustion engine developed by Etienne Lenoir . This experience would be helpful later when he joined Nikolaus August Otto's company N.A. Otto & Cie (Otto and Company). In 1872 Gottlieb Daimler had become
2944-588: The names Honda Titanium Exhaust Valve (HTEV) and Honda Variable Intake/Exhaust (H-VIX), appearing on the CBR600RR and Honda CBR929RR . Suzuki 's version is called Suzuki Exhaust Tuning (SET). The system is also used on the Triumph Daytona 675 triple . At low engine speeds, the wave pressure within the pipe network is low. A full oscillation of the Helmholtz resonance occurs before the exhaust valve
3008-417: The next year when the plant was moved. Otto had no interest in making engines small enough to be used in transportation. After some dispute over the direction design of the engines should take Daimler left Deutz and took Maybach with him. Together they moved to the town Cannstatt where they began work on a "high speed explosion engine." This goal was achieved in 1883 with the development of their first engine,
3072-467: The outriggers are accepted as auxiliary stabilizers, they point to a deeper issue in bicycle and motorcycle dynamics , in that Daimler's testbed needed the training wheels because it did not employ the then well-understood principles of rake and trail . For this and other reasons motoring author David Burgess-Wise called the Daimler-Maybach "a crude makeshift", saying that "as a bicycle, it
3136-415: The piston speed for industrial engines to about 10 m/s. The output power of an engine is dependent on the ability of intake (air–fuel mixture) and exhaust matter to move quickly through valve ports, typically located in the cylinder head . To increase an engine's output power, irregularities in the intake and exhaust paths, such as casting flaws, can be removed, and, with the aid of an air flow bench ,
3200-421: The power output limits of an internal combustion engine relative to its displacement. Most commonly, the supercharger is always running, but there have been designs that allow it to be cut out or run at varying speeds (relative to engine speed). Mechanically driven supercharging has the disadvantage that some of the output power is used to drive the supercharger, while power is wasted in the high pressure exhaust, as
3264-472: The problem, with no success. In 1864, Otto and Eugen Langen founded the first internal combustion engine production company, NA Otto and Cie (NA Otto and Company). Otto and Cie succeeded in creating a successful atmospheric engine that same year. The factory ran out of space and was moved to the town of Deutz , Germany in 1869, where the company was renamed to Deutz Gasmotorenfabrik AG (The Deutz Gas Engine Manufacturing Company). In 1872, Gottlieb Daimler
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#17328021333283328-497: The radii of valve port turns and valve seat configuration can be modified to reduce resistance. This process is called porting , and it can be done by hand or with a CNC machine. An internal combustion engine is on average capable of converting only 40-45% of supplied energy into mechanical work. A large part of the waste energy is in the form of heat that is released to the environment through coolant, fins etc. If somehow waste heat could be captured and turned to mechanical energy,
3392-399: The ring and the cylinder wall, which causes a loss of cylinder pressure and power. If an engine spins too quickly, valve springs cannot act quickly enough to close the valves. This is commonly referred to as ' valve float ', and it can result in piston to valve contact, severely damaging the engine. At high speeds the lubrication of piston cylinder wall interface tends to break down. This limits
3456-502: The same motivation as Otto, Diesel wanted to create an engine that would give small industrial companies their own power source to enable them to compete against larger companies, and like Otto, to get away from the requirement to be tied to a municipal fuel supply. Like Otto, it took more than a decade to produce the high-compression engine that could self-ignite fuel sprayed into the cylinder. Diesel used an air spray combined with fuel in his first engine. During initial development, one of
3520-406: The same time preventing engine damage from pre-ignition. High Octane fuel is also more expensive. Many modern four-stroke engines employ gasoline direct injection or GDI. In a gasoline direct-injected engine, the injector nozzle protrudes into the combustion chamber. The direct fuel injector injects gasoline under a very high pressure into the cylinder during the compression stroke, when the piston
3584-498: The same time. Use of the Rankine Cycle , turbocharging and thermoelectric generation can be very useful as a waste heat recovery system. One way to increase engine power is to force more air into the cylinder so that more power can be produced from each power stroke. This can be done using some type of air compression device known as a supercharger , which can be powered by the engine crankshaft. Supercharging increases
3648-452: The speed of the flame front does not change so the spark point is advanced earlier in the cycle to allow a greater proportion of the cycle for the charge to combust before the power stroke commences. This advantage is reflected in the various Otto engine designs; the atmospheric (non-compression) engine operates at 12% efficiency whereas the compressed-charge engine has an operating efficiency around 30%. A problem with compressed charge engines
3712-407: The turbocharger's turbine to start compressing much more air than normal into the intake manifold. Thus, additional power (and speed) is expelled through the function of this turbine. Turbocharging allows for more efficient engine operation because it is driven by exhaust pressure that would otherwise be (mostly) wasted, but there is a design limitation known as turbo lag . The increased engine power
3776-423: The use of a glow plug . The maximum amount of power generated by an engine is determined by the maximum amount of air ingested. The amount of power generated by a piston engine is related to its size (cylinder volume), whether it is a two-stroke engine or four-stroke design, volumetric efficiency , losses, air-to-fuel ratio, the calorific value of the fuel, oxygen content of the air and speed ( RPM ). The speed
3840-438: The valves not closing properly. This results in a loss of performance and possibly overheating of exhaust valves. Typically, the clearance must be readjusted each 20,000 miles (32,000 km) with a feeler gauge. Most modern production engines use hydraulic lifters to automatically compensate for valve train component wear. Dirty engine oil may cause lifter failure. Otto engines are about 30% efficient; in other words, 30% of
3904-521: Was 20 years out of date." Cycle World 's Technical Editor Kevin Cameron , however, maintains that steam power was a dead end and the Reitwagen was the first motorcycle because it hit upon the successful engine type, saying, "History follows things that succeed, not things that fail." Enrico Bernardi 's 1882 one-cylinder gasoline-engined tricycle , the Motrice Pia , is considered by
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#17328021333283968-476: Was a motor vehicle made by Gottlieb Daimler and Wilhelm Maybach in 1885. It is widely recognized as the first motorcycle . Daimler is often called "the father of the motorcycle" for this invention. Even when the steam powered two-wheelers that preceded the Reitwagen , the Michaux-Perreaux and Roper of 1867–1869, and the 1884 Copeland , are considered motorcycles, it remains nonetheless
4032-406: Was technical director and Wilhelm Maybach was the head of engine design. Daimler was a gunsmith who had worked on the Lenoir engine. By 1876, Otto and Langen succeeded in creating the first internal combustion engine that compressed the fuel mixture prior to combustion for far higher efficiency than any engine created to this time. Daimler and Maybach left their employ at Otto and Cie and developed
4096-413: Was to install the engine in a test bed to prove the viability of their engine in a vehicle. Their goal was to learn what the engine could do, and not to create a motorcycle; it was just that the engine prototype was not yet powerful enough for a full size carriage. The original design of 1884 used a belt drive , and twist grip on the handlebars which applied the brake when turned one way and tensioned
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