In Automobile design, an MR or Mid-engine, Rear wheel drive layout drives the rear wheels with an engine placed just in front of them, behind the passenger compartment. In contrast to the rear-engined RR layout the center of gravity of the engine is in front of the rear axle. This layout is typically chosen for its near-ideal weight distribution. The mid-engined layout does, however, use up a lot of space, making it impractical for any but two-seater sports cars.
In contrast to the rear-engined RR layout, the center of mass of the engine is in front of the rear axle.
This layout is typically chosen for its low polar inertia and relatively favorable weight distribution (the heaviest component is near the center of the car, making the main component of its moment of inertia relatively low).
In modern racing cars, MR is the usual configuration and is usually synonymous with "rear engine".
A mid-mounted engine describes the placement of an automobileengine between the centerline of the rear and front axles.
This configuration is known as a mid-engine, rear-drive An engine placed in front of the driver's compartment but fully behind the front axle line also meets the definition of a mid-engine.
Mid-engine designs are usually used in sports or racing cars, as the engine placement provides a low polar moment of inertia by keeping most of the mass close to the center of the vehicle.
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