The hood (North America) or bonnet (Commonwealth) is the hinged cover over the engine of motor vehicles that allows access to the engine compartment for maintenance and repair. A hinge is a type of bearing that connects two solid objects typically allowing only a limited angle of Rotation between them A lid is part of a container, and serves as the cover or seal, usually one that completely closes the object An engine is a mechanical device that produces some form of output from a given input A motor Vehicle is a Machine which incorporates a motor (sometimes known as an Engine) and which is used for Transportation An auto mechanic (or car mechanic in British English and motor mechanic in Australian English) is a Mechanic who specializes in In British terminology, hood refers to a fabric cover over the passenger compartment of the car (known as the 'top' in the US).
On passenger cars, a hood may be held down by a concealed latch. On race cars or cars with aftermarket hoods (that do not use the factory latch system) the hood may be held down by hood pins. A hood may sometimes contain a hood ornament, hood scoop, power bulge, and/or wiper jets. A hood/bonnet ornament or car mascot is a specially crafted model of something which symbolizes a car company like a badge located on the front center portion of the 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 A power bulge is a raised part (a bulge of the hood of a car The reason for a power bulge is to fit for instance a large engine or air filters that otherwise would not A windscreen wiper ( windshield wiper in North America) is a device used to wipe Rain and dirt from a Windscreen. Hoods are typically made out of steel, but aluminium is rapidly gaining popularity with auto companies. Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0 WikipediaNaming Aftermarket manufacturers may construct hoods out of fiberglass, carbon fiber, or dry carbon. Fiberglass (also called fibreglass and glass fibre see Spelling differences) is material made from extremely fine Fibers of Glass.
In Japan and Europe, regulations have come into effect in recent years that place a limit on the severity of pedestrian head injury when struck by a motor vehicle. For a topic outline on this subject see List of basic Japan topics. This is leading to more advanced hood designs, as evidenced by multicone hood inner panel designs as found on the Mazda RX-8 and other vehicles. The Mazda RX-8 is a Sports car manufactured by Mazda Motor Corporation. Other changes are being made to use the bonnet / hood as an active structure and push its surface several cm away from the hard motor components during a pedestrian crash. This may be achieved by mechanical (spring force) or pyrotechnic devices. The term "pyrotechnics" can also be used for Fireworks events
A recent trend in street racing has been to raise the rear end of the hood to promote cooling, although this, in theory, does little, except at dead stop, since the area of the hood directly in front of the windshield and the lowest portions of the windshield are almost always positive pressure zones (air actually flows into the engine bay, not out of it, increasing engine bay pressure).
See also
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