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Automotive Trends in Asia
Published in Leslie R. Rudnick, Synthetics, Mineral Oils, and Bio-Based Lubricants, 2020
In October 2011, Mazda decided to stop production of rotary engines. Pressures to cut back on oil consumption appear to have played a part in the demise of Mazda’s rotary engine. The Mazda rotary is also known as the Wankel engine after its German inventor, Felix Wankel. Mazda persevered with the engine, even though no other major vehicle manufacturer used it. The company’s sporty RX-7 always attracted a fair degree of respect among motoring enthusiasts, even if they needed to carry around extra engine oil.
Internal Combustion Engines
Published in Mehrdad Ehsani, Yimin Gao, Ali Emadi, and Fuel Cell Vehicles, 2017
Mehrdad Ehsani, Yimin Gao, Ali Emadi
The advantages of the Wankel engine are as follows: Because the engine delivers one power stroke for each full crankshaft rotation, the Wankel uses its displacement volume twice as often as the SI engine does. One immediate advantage is that for equivalent power output, a Wankel engine is only about half the size and weight of a conventional engine.
Shaft Engines
Published in Ahmed F. El-Sayed, Aircraft Propulsion and Gas Turbine Engines, 2017
The Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into a rotating motion, instead of using reciprocating pistons. Its four-stroke cycle (shown in Figure 6.3) takes place in a space between the inside of an oval-like epitrochoid-shaped housing and a rotor that is similar in shape to a Reuleaux triangle but having somewhat flatter sides. The very compact Wankel engine delivers smooth power at high rpm. It also has high horsepower per displacement compared with other internal combustion engines. The lubrication system is similar to that of the two-stroke engine and thus it does not need a separate system, unlike the four-stroke engine.
Effects of ethanol, methyl tert-butyl ether and gasoline-hydrogen blend on performance parameters and HC emission at Wankel engine
Published in Biofuels, 2020
Wankel engines have been under development for more than 50 years. The Wankel engine is an internal combustion engine that has an eccentric rotating design and converts the pressure after combustion to a rotary motion with a Reuleaux triangle-style piston [1]. The power transmission is carried out directly by the shaft connected to the piston. Therefore, it has a less complicated working system than other engines. The structure of the engine consists of a rotor (Reuleaux triangle-style piston) and a camshaft rotating off the center in an oval engine body. The rotor is connected to the engine main shaft with an internal and an external gear [1–3]. The Wankel engine operates according to the four-time-cycle principle. Intake, compression, expansion and exhaust times occur around the rotor. In other words, all engine times occur in the Wankel engine at the same time [4–8]. A net amount of work occurs in each full cycle of the rotor. Due to this feature, the Wankel engine is different from a four-stroke piston engine.