- Q -

Quarter Race Cam

A camshaft that has been regrown to provide better than standard performance.

Quarter-speed Cam

A camshaft that rotates once for each four revolutions of the crankshaft.

Quarts-iodine

A lamp containing gaseous iodine (I).

Quartz

A mineral found in nature as a hexagonal cross section. It is pointed at one end and has a fractured base where it broke from the rock formation in which it grew.

Quartz Crystal

A thin slab cut from quartz ground to the proper thickness so it will vibrate at a desired frequency when supplied with energy.

Quartz-halogen

A type of high output lamp containing a gaseous halogen; used for headlights, driving lights, or fog lights.

Quattro

A full-time, four-wheel drive system by Audi.

Quench

To suddenly cool a heated metal or alloy by dousing it with water or oil.

Quench Area

Any internal portion of a combustion chamber which causes combustion to cease because of the temperature drop in the air/fuel charge where it meets this area.

Quick Change

Any system or sub system that is designed for ease and speed for changing or replacing.

Quick Charger

A battery charger that is designed to charge or boost a battery in a short time.

Quick Coupler

A coupler that allows hoses to be quickly connected and/or disconnected. Most shop air hoses, for example, are equipped with quick couplers.

Quick Release Valve

A device used to exhaust air as close as possible to the service chambers or spring brakes.

Quick Take-up Master Cylinder

A dual master cylinder that supplies a large volume of fluid to the front disc brakes on initial brake application, which takes up the clearance of low-drag calipers.

Quick Take-up Valve

The part of the quick take-up master cylinder that controls fluid flow between the reservoir and the primary low pressure chamber.