by 
The Curious Bag
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Vehicles of all types have motor mounts (engine mounts), whose main purpose is to keep the engine off the ground. Modern motor mounts also perform a number of other functions.
History
Flexible motor mounts as we know them today were originally used on the first military bombers in 1911, as it was found that un-dampened vibrations of their massive engines would shake the airframe to pieces.
Purpose
The primary purpose of an engine mount is to keep the engine from falling out of the vehicle or moving around under torque. Motor mounts also serve as dampers to prevent engine vibrations from working their way to the chassis.
Rubber Mounts
Most cars use mounts of hard rubber and metal. When compressed by the weight of the engine, rubber mounts can form strong structural components and still manage to dampen vibration.
Fluid Mounts
A fluid-filled motor mount uses an outside shell of flexible rubber to hold a small pocket of glycol-based gel to reduce vibration transmission.
Solid Mounts
Solid metal and polyurethane mounts are used in performance applications. These types can help to speed down-shifting, and to decrease wheel-hop in front-wheel-drive cars.
Source:
MachV.com: Polyurethane Mounts
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