Cars - http://maxpages.com/carsinhistory/D

Dump truck: A straight truck with a body designed to be tilted to unload, usually through a gate in the rear.

DuPont: The 1925-1948 models are classic cars.

Duration: The length of time that an action is allowed to operate. See valve duration.

Durometer: A device to indicate the hardness of rubber.

Dust cap: 1. A metal or plastic covering that fits into a hub shell to keep contaminants out of hub bearings. 2. A metal or plastic end cover for a spindle in a pedal or a cotterless crankset.

Dust cover: A soft, flexible valve cap to protect the valve assembly from dust while in shipment and storage. It is not capable of sealing the air pressure and should not be used in service.

Dust shield: Sheet metal disc or plate placed on the brake assembly to keep debris from brake assembly.

Duty drawback: import duties or taxes repaid by a government in whole or in part, when the imported goods are re-exported or used in the manufacture of exported goods.

Duty paid value: in respect to imported goods, is the aggregate value for duty on imported goods.

Duty waiver: forgiveness, in whole or in part, of import duties when certain conditions are met.

Dwell: The number of degrees the breaker cam rotates from the time the breaker points close until they open again. Also called the "dwell angle" or "dwell period."

Dwell angle: See dwell.

Dwell meter: An instrument which determines the number of degrees the breaker cam rotates while the breaker points are closed. Changing the point gap affects the dwell angle. When the breaker points are correctly gapped, the distributor can give the proper amount and duration of spark to the spark plugs.

Dwell period: See dwell.
Dykes ring: A compression piston ring which is L-shaped when viewed from the end. When installed in the piston, the horizontal part fits more deeply in the piston groove while the vertical side rubs against the cylinder wall. This style of ring gives good sealing and prevents piston-ring flutter during acceleration and deceleration of the piston.

Dynamic balance: When the center line of the weight mass of a revolving object is in the same plane as the center line of the object, that object would be in dynamic balance. For example, the weight mass of the tire must be in the same plane as the center line of the wheel. Static balance is made off the vehicle and determined with the tire stationary. Dynamic balance is made with the tire in rotation.

Dynamo: Another word for generator. Also see alternator.

Dynamometer: An electric or hydraulic machine used to measure the actual engine horsepower output and torque. An engine dynamometer measures horsepower at the crankshaft and a chassis dynamometer measures horsepower output at the wheels.

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Page Updated Sun May 20, 2001 8:08pm EDT