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Rear-engine design

From Wikipedia, the free encyclopedia
The most famous and influential rear-engine car: Volkswagen Beetle, over 21 million built in about half a century, a movie star as Herbie, and ancestor of the Porsche 911
Floor pan of a Volkswagen Beetle, pedals in the front, engine in the rear
Porsche 911, here as turbocharged race car with big wing over the air-cooled flat-6 rear engine, won World Championship races and Le Mans against dedicated mid-engine prototypes

In automobile design, a rear-engine design layout places the combustion engine in the rear of the vehicle, behind the rear axle. In its most successful application, in the Volkswagen Beetle and the Porsche 911, the rear engine was combined with air-cooling for light weight, and a flat engine "Boxer" layout to reduce length and lower the center of gravity both of the engine and of the car.

Rear-engine position / Rear-wheel drive

Rear-engined vehicles almost always have a rear-wheel drive car layout, but some are four wheel drive. This layout has the following features:

  • Packaging: since there is no need for a transmission tunnel, the floor can be flat.[1]
  • Rear traction: having the engine located over the driven wheels increases downward pressure, which is helpful for grip on loose surfaces, although can be prone to oversteer.[2]
  • Simplicity of manufacture: the engine is near the driven wheels, and the transmission can be merged with the differential to save space.

This layout was once popular in small, inexpensive cars and light commercial vehicles. Today most car makers have abandoned the layout although it does continue in some expensive cars,[3] like the Porsche 911. It is also used in some racing car applications,[4] low-floor buses, coach buses, Class A motorhomes, front-discharge cement mixers, some Type-D school buses, and microcars such as the Smart Fortwo. Some electric cars feature both rear and front motors, to drive all four wheels.[5]

Notable rear-engined cars

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This Porsche 953 had AWD and won Paris-Dakar
Smart Fortwo's three-cylinder engine sits behind the rear axle.

See also

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References

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  1. ↑ "1965 Chevrolet Corvair". Archived from the original on 7 August 2020. Retrieved 16 March 2019.
  2. ↑ "What Is Rear Engine Layout And Know How Is It Beneficial?". Retrieved 16 March 2019.
  3. ↑ Threewitt, Cherise. "10 Affordable Rear Engine Cars". Retrieved 16 March 2019.
  4. ↑ Wong, J. Y. (2008). Theory of Ground Vehicles. Hoboken NJ: Wiley. p. 560. ISBN 0-471-35461-9.
  5. ↑ Adams, Eric. "The Secrets of Electric Cars and Their Motors: It's Not All About the Battery, Folks". Retrieved 16 March 2019.
  6. ↑ Golseth, Andrew. "Why Is The Chevrolet Corvair Such An Overlooked Classic?". Retrieved 16 March 2019.