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This document summarizes and compares two-stroke and four-stroke engines. It explains that two-stroke engines complete the combustion cycle in one crankshaft revolution while four-stroke engines take four strokes. Two-stroke engines are lighter and cheaper to make but are less efficient and more polluting. Four-stroke engines are heavier but run more efficiently and produce less pollution.
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Rotary Engines
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This document compares piston engines and rotary engines. It discusses their design differences, performance, fuel consumption, and emissions. While rotary engines can provide good performance in compact designs, they typically consume more fuel than piston engines due to their combustion chamber shape and lower compression ratio. Rotary engines also emit more carbon monoxide and unburnt hydrocarbons, making them difficult to regulate under emission standards. Therefore, the document concludes that rotary engines are best suited for applications requiring high performance or a lightweight design, but are less optimal for fuel efficiency or meeting emission regulations compared to piston engines.Wankel engine
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The Wankel engine uses an eccentric rotary design instead of pistons, where the four-stroke cycle occurs inside an oval housing and triangle-shaped rotor. It functions as a variable-volume progressing-cavity system with three cavities repeating the cycle. Wankel engines are lighter, simpler, and have fewer moving parts than equivalent piston engines. They provide high reliability, smooth power delivery, and a high power-to-weight ratio, but consume more fuel and produce more unburnt hydrocarbons than four-stroke engines. Wankel engines are used in cars, motorcycles, and aircraft for their light weight, small size, and durability in all weather. Mazda has designed some of the best WankelWankel engine
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The document summarizes the Wankel rotary engine. It describes the main parts of the engine including the rotor, housing, eccentric shaft, and apex seal. It explains the four-stroke working principle of intake, compression, power, and exhaust. The Wankel engine offers benefits like simplicity and high power but has disadvantages such as oil leakage and high fuel consumption. Applications include use in automotive racing, motorcycles, and aircraft.Wankel engine
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The document discusses the Wankel rotary engine, including:
- Its invention in 1954 by German engineer Felix Wankel and use in cars like the Mazda RX-8.
- How it works using a spinning rotor and three chambers instead of pistons, making it lighter and smoother.
- The challenges in designing it, such as getting measurements correct, preventing interference, and assembling the complex parts.1 wankel engine assaignment
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The document summarizes the Wankel rotary combustion engine. It describes the engine's design which uses an eccentric rotary motion rather than reciprocating pistons. This allows for advantages like simplicity, compactness, and high power-to-weight ratio. The engine uses three rotor tips moving inside an oval housing to produce three power pulses per revolution. It operates on a four-stroke cycle like a piston engine. The Wankel engine has fewer moving parts than piston engines and no valves, allowing it to run more smoothly with less vibration at high RPMs. It can achieve high performance at high speeds due to lower friction and longer intake/exhaust strokes without valves restricting airflow.Wankel
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The Wankel engine is a type of internal combustion engine that uses a rotary design instead of pistons. It was developed in 1951 by Felix Wankel and uses a four-stroke combustion cycle. The key components are a triangular rotor that rotates inside an oval-shaped housing, with the rotor acting like a piston in a traditional engine. The rotor spins on an eccentric output shaft, turning three times for every one revolution to power the vehicle. Benefits include simplicity, high power-to-weight ratio, and smooth operation, though fuel efficiency is reduced compared to piston engines. It has seen limited automotive use primarily in Mazda vehicles.Wankle rotary engine by mrityunjaya chauhan
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The document discusses the Wankel rotary engine, including its history, advantages, disadvantages, and applications. It was designed by Felix Wankel in the 1920s and primarily manufactured by Mazda. Key advantages include high power-to-weight ratio, small size, and ability to reach high RPMs with little vibration. Main disadvantages are lower fuel efficiency than piston engines and difficult emissions control. Applications include automobiles, motorcycles, aircraft, range extenders, and personal watercraft.Wankel engine
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Two-stroke engines are used in devices such as weed trimmers, snowmobiles, and chainsaws, operating with fewer parts and firing once per revolution for higher power output than four-stroke engines. Their operation involves drawing in a fuel mixture, compressing it, igniting it, and expelling exhaust without traditional valves, which makes them lighter and easier to work on but results in less durability and higher pollution levels. However, they require a mix of oil with gasoline, affecting fuel efficiency and increasing operational costs.Rotary Engines
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The document summarizes the key aspects of a Wankel rotary engine. It describes how a rotary engine works differently than a piston engine by having each step of the combustion process occur in a dedicated section of the oval-shaped housing as the rotor continuously rotates. It also notes that rotary engines have fewer moving parts, provide smoother power delivery, and have parts that move more slowly compared to piston engines. However, rotary engines can be more difficult to design to meet emissions regulations and typically have lower thermodynamic efficiency.Rotary wankel engine
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This lab report discusses the rotary Wankel engine. It provides details on the objective to study the rotary Wankel engine. It describes the basic working principle of the rotary Wankel engine, including its four strokes of intake, compression, ignition, and exhaust that occur around an oval shape rather than a piston. It discusses the design parameters, types, parts, cycle, and concludes that the rotary Wankel engine is better than an Otto engine and is widely used in automobiles.2stroke
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The document describes the four stages of the combustion cycle in a four-stroke engine: intake, compression, power, and exhaust. During intake, the piston moves downward and draws in the fuel-air mixture. In compression, the piston rises and compresses the mixture. At top of compression, the spark plug ignites the fuel. During power, the burning fuel expands and drives the piston downward. In exhaust, the exhaust valve opens and the spent gases are driven out.Quasi Turbine Engine
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The Quasiturbine engine was developed as an improvement on the standard Wankel or rotary engine. Unlike piston or standard rotary engines, the Quasiturbine's four-element rotor and carriages allow it to withstand the high pressures needed for photo-detonation combustion. This makes the Quasiturbine more efficient than piston or standard rotary engines. The Quasiturbine engine arranges the four strokes of combustion sequentially around an oval housing without needing a crankshaft. This produces power with each revolution rather than every other revolution as in piston engines. While still in development, the Quasiturbine engine aims to be simpler and more efficient than conventional engines.Difference between 4-stroke Petrol Engine and 4-stroke Diesel Engine
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The document discusses the quasi turbine engine, a pistonless rotary engine. It has a deformable rotor made of blades hinged at the vertices that is enclosed in an oval housing. The rotor undergoes compression and expansion similar to the Wankel engine. There are two types - one without a carriage where the rotor seals directly to the housing, and one with a carriage that has ports for spark plugs, intake, and exhaust. The quasi turbine operates on the same four stroke cycle as an internal combustion engine but does not require pistons or a crankshaft. It provides advantages like simplicity, reduced vibration, higher torque at lower RPMs, and increased fuel efficiency. However, it is still in development and not yetEngines
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This document discusses the Duke engine, which is a type of reciprocating engine with pistons arranged around an output shaft parallel to the shaft. The key advantage is the compact, cylindrical design with cylinders arranged parallel to the crank shaft. The main elements are the barrel, which refers to the cylindrical shape, and the swash plate, which translates rotating shaft motion to reciprocating piston motion. Testing has shown the Duke engine can be up to 19% lighter and 36% smaller than conventional engines while maintaining comparable performance. It can run on various fuels and has applications in vehicles, marine uses, and power generation due to its advantages of high efficiency, low vibration, and compact size.Quasi turbine engine
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This document discusses the Duke engine, which is a type of reciprocating engine with pistons arranged around an output shaft parallel to the shaft. The key advantage is the compact, cylindrical design with cylinders arranged parallel to the crank shaft. The main elements are the barrel, which refers to the cylindrical shape, and the swash plate, which translates rotating shaft motion to reciprocating piston motion. Testing has shown the Duke engine can be up to 19% lighter and 36% smaller than conventional engines while maintaining comparable performance. It can run on various fuels and has applications in vehicles, marine uses, and power generation due to its advantages of high efficiency, low vibration, and compact size.Quasi turbine engine
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The document describes the Quasi Turbine engine, a proposed pistonless rotary engine. It has a rhomboidal rotor with hinged sides that allow for increased compression and expansion ratios compared to the Wankel engine. The Quasi Turbine has fewer parts than pistons engines, is more efficient, produces high torque at low RPM, and has potential applications in aviation, power tools, vehicles and pumps due to its compact size, lack of vibration, and mechanical simplicity. The engine works through intake, compression, combustion and exhaust cycles without the use of pistons or crankshafts.Engine Presentation
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The document summarizes a quasi turbine engine, which is a rotary engine invented in 1996 that has a 4-sided articulated rotor. It produces strong torque at low RPM without vibrations. The objectives are to combine the compressor and turbine into one unit for low noise and perfect balance. There are two models - one without carriages that has an oval housing and one with carriages that uses wheels and traction slots. It has advantages over traditional engines like fewer moving parts, less pollution, and better torque continuity. Potential applications include aviation, racing cars, and hydrogen engines.Viewers also liked (13)
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- 1. MAKTAB KEJURUTERAAN JEFRI BOLKIAH
- 4. What is two-stroke engine? ?internal combustion engine that completes the process cycle in one revolution of the crankshaft. What is four-stroke engine? ?known as four-cycle ?Internal combustion engine in which the piston completes four separate strokes cycle
- 6. Spark Combustion plug chamber Piston Exhaust Reed outlet valve Fuel Crankcase intake Fuel
- 9. Spark Intake plug valve Exhaust Intake valve port Cooling Exhaust fins port Piston Connecting rod Crankcase Crankshaft
- 11. ?Do not have valves, simplifying their construction. ?Fire once every revolution. ?Lighter, and cost less to manufacture. ?Potential for about twice the power in the same size
- 12. ?Don't live as long ?Oil can be expensive. ?Produce more pollution. ?Do not use fuel efficiently, yielding fewer miles per gallon.
Editor's Notes
- #5: Internal combustion engine in which the?piston?completes four separate strokes cycle which include:-Intake CompressionPower exhaust
- #8: "Stroke" refers to the movement of the piston in the engine.2 Stroke means one stroke in each direction.??A 2 stoke engine will have a compression stroke followed by an explosion of the compressed fuel.
- #11: One compression stroke and one exhaust stoke.Distributor that supplies a spark to the cylinder only when its piston is near TDC on the fuel compression stroke.TDC (Top dead center)
- #12: Two-stroke engines fire once every revolution.?(four-stroke engines fire once every other revolution).Potential for about twice the power in the same size because there are twice as many power strokes per revolution.