A Boss 302 engine with the optional factory shaker scoop.

A shaker scoop (sometimes, inaccurately, called a shaker hood scoop or a shaker hood) is an automobile term for an air intake for combustion air that is mounted directly on top of the engine's air cleaner and protrudes through a hole in the hood. A bonnet/hood scoop is an air vent on the bonnet of an Automobile that either allows a flow of air to directly enter the engine compartment or appears to do The internal combustion engine is an engine in which the Combustion of Fuel and an Oxidizer (typically air occurs in a confined space called a An air filter is a device which removes solid Particulates such as Dust, Pollen, Mold, and bacteria from Air. The hood (North America or bonnet (Commonwealth is the Hinged cover over the Engine of Motor vehicles that allows access Since it is fastened directly to the engine, it moves with the engine's movement and vibration on its mountings, thus the 'shaker' name.

Some official Chrysler literature referred to this popular hood style as the "Incredible Quivering Exposed Cold Air Grabber"^[1]. This lengthy title has since been shortened by enthusiasts and collectors to the less tongue-twisting "shaker hood".

Like all such scoops, its purpose is to increase performance at high speed by a 'ram air' effect, delivering high pressure air to the engine. Unfortunately engines draw air in hundreds of cubic feet per minute so scoops are not practical to raise intake pressures significantly. Other benefits of a shaker hood include, elevation to prevent water from being drawn on flooded terrain, a cooler source of air, and a more direct path to the engines throttle plate. Because of the high volume of air that engines draw, rain, even a downpour, cannot cause significant damage/wear to the engine.

Such scoops were fitted to a variety of cars, including:

• Dodge Challenger
• Ford Mustang
• Plymouth Barracuda
• Pontiac GTO
• Pontiac Firebird Trans Am
• Ford Falcon XY GT Phase III

References