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For liquid-cooled vehicles, however, this layout presents a disadvantage, since it requires either increased coolant piping from a front-mounted radiator (meaning more weight and complexity), or relocating the radiator(s) to the sides or rear, and adding air ducting to compensate for the lower airflow at the rear of the car.
The configuration of a car body is typically determined by the layout of the engine, passenger and luggage compartments, which can be shared or separately articulated. A key design feature is the car's roof-supporting pillars, designated from front to rear of the car as A-pillar, B-pillar, C-pillar and D-pillar.
Early cars using the FWD layout include the 1925 Alvis, 1929 Cord L-29, 1931 DKW F1, the 1948 Citroën 2CV, 1949 Saab 92, the 1957 Trabant P50, and the 1959 Mini.In the 1980s, the traction and packaging advantages of this layout caused many compact and mid-sized vehicle makers to adopt it in the US.
The mechanical layout and packaging of an RMR car are substantially different from that of a front-engine or rear-engine car. When the engine is in front of the driver, but fully behind the front axle line, the layout is sometimes called a front mid-engine, rear-wheel-drive, or FMR layout instead of the less-specific term front-engine; and can ...
R4 layout, the engine is located behind the rear axle. In automotive design, an R4, or rear-engine, four-wheel-drive layout places the engine at the rear of the vehicle, and drives all four roadwheels. This layout is typically chosen to improve the traction or the handling of existing vehicle designs using the rear-engine, rear-wheel-drive ...
F4 layout. In automotive design, an F4, or front-engine, four-wheel drive (4WD) layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This layout is typically chosen for better control on many surfaces, and is an important part of rally racing, as well as off-road driving. In terms of racing ...
RMR layout; the engine is located in front of the rear axle. Rear Mid-engine transversely-mounted / Rear-wheel drive. In automotive design, an RMR, or rear mid-engine, rear-wheel-drive layout is one in which the rear wheels are driven by an engine placed with its center of gravity in front of the rear axle, and thus right behind the passenger compartment.
The earliest example of the form appeared in 1932, with the design and construction of the prototype Maroon Car by chief designer Harleigh Holmes at Coleman Motors, an established builder of Front- and All-Wheel-Drive vehicles based in Littleton, Colorado. [1] The car had front-wheel drive and was powered by a rear-mounted V-8 engine.