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Dual-Point System

1. An ignition system with two sets of points in the distributor. 2. A system that controls spark timing by electro-mechanical selection of separate advance and retard points.

Dualie

See dually.

Duallie

A Dodge pick-up truck with dual wheels; popular reference for any dual-wheel vehicle.

Dually

A pickup truck configuration that has two wheels and tires on each side in the rear, for extra hauling and towing capacity.

Duals

A term generally referring to two exhaust systems; two of anything, wheels, for example.

Dubble Start Override

Prevents the starter motor from being energized if the engine is already running.

Ducktail

An upswept rear end, often with a spoiler.

Duct

A tube or passage used to provide a means to transfer air or liquid from one point or place to another.

Duct Tape

A heavy duty, fiber-backed tape used for emergency repairs to body parts, in all forms of racing.

Ductility

The property of a material that permits it to be worked by drawing or stretching without rupture.

Duesie

1. Anything truly fine or outstanding. 2. Short for Duesenberg, touted by many to be the finest race car ever built. Also, doozie.

Dummy

A mannequin, such as used in crash tests.

Dummy Load

An electrical test procedure to simulate actual operating conditions.

Dummy Shaft

A shaft used as an aid in the assembly or disassembly of a parts group.

Dump

1. To lower the front end. 2. To defeat a competitor in a drag race. 3. To damage or destroy a component, such as a transmission.

Dump Station

A facility where RVs and others clean their holding tanks.

Dump Tubes

Straight through exhaust headers.

Dumped And Tubbed

A vehicle that has been lowered in the front and fitted with oversize wheel wells.

Dune Buggy

A small, light-weight, off-road vehicle with little or no body work.

Duo-servo

A drum brake design with increased stopping power due to the servo or self-energizing effect of the brake.