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Front-engine, rear-wheel-drive layout

From Wikipedia, the free encyclopedia

FR layout
FR layout

In automotive design, an FR, or front-engine, rear-wheel-drive layout is one where the engine is located at the front of the vehicle and driven wheels are located at the rear. This was the traditional automobile layout for most of the 20th century.[1] Modern designs commonly use the front-engine, front-wheel-drive layout (FF). Today mostly BMW and Mercedes-Benz uses that layout.

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Transcription

Contents

Front mid-engine, rear-wheel-drive layout

FMR layout, the engine is located behind the front axle.
FMR layout, the engine is located behind the front axle.

In automotive design, a front mid-engine, rear-wheel-drive layout (FMR) is one that places the engine in the front, with the rear wheels of vehicle being driven. In contrast to the front-engine, rear-wheel-drive layout (FR), the engine is pushed back far enough that its center of mass is to the rear of the front axle. This aids in weight distribution and reduces the moment of inertia, improving the vehicle's handling. The mechanical layout of an FMR is substantially the same as an FR car. Some models of the same vehicle can be classified as either FR or FMR depending on the length of the installed engine (e.g. 4-cylinder vs. 6-cylinder) and its centre of mass in relation to the front axle.

Characteristics

  • FMR cars are often characterized by a long hood and front wheels that are pushed forward to the corners of the vehicle, close to the front bumper. Grand tourers often have FMR layouts, as a rear engine would not leave much space for the rear seats.
  • FMR should also not be confused with a "front midships" location of the engine, referring to the engine being located fully behind the front axle centerline, in which case a car meeting the above FMR center of mass definition could be classified as a FR layout instead. The V35 Nissan Skyline / Infiniti G35 / Nissan 350Z are FM cars.
  • FMR layout came standard in most pre–World War II, front-engine / rear-wheel-drive cars.

Gallery

References

  1. ^ "Development of a New Hybrid Transmission for RWD Car". www.sae.org. Retrieved 2008-01-11.
This page was last edited on 10 September 2019, at 18:19
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