Glossary “direct ignition system” Definition:
Ignition system where impulses are sent directly to the spark plugs by a modulator.

Glossary “direct injection” Definition:
Type of fuel-injection system that injects fuel directly into the cylinders.

Glossary “direct clutch solenoid” Definition:
Solenoid that directs fluid flow to engage the direct clutch in an A/T..

Glossary “direct current (DC)” Definition:
Current flow in one direction only such as the current produced by a battery.

Glossary “direct drive” Definition:
A transmission mode in which the driveshaft and engine crankshaft are at the same speed.

Glossary “Direct Fuel Cell” Definition:
A type of fuel cell in which a hydrocarbon fuel is fed directly to the fuel cell stack without requring an external “reformer” to generate hydrogen.

Glossary “direct acting shock absorber” Definition:
A double-action design controlling up and down suspension travel; it is mounted directly between the frame of the vehicle and the control arm or axle.

Glossary “direct acting thermostatic air cleaner” Definition:
Component of the heated air-intake systems that uses a thermostatic bulb connected to a rod to operate a flapper valve in the air-cleaner snorkel.

Glossary “direct battery power” Definition:
Power available to a circuit in the automobile directly from the battery, without an intermediate switch.

Glossary “direct bonded bearing” Definition:
A bearing that is formed by pouring molten babbitt directly into the bearing housing and machining the cooled metal to the desired diameter.