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Combustion Knock

A term often used for knock.

Combustion Pressure

The pressure in the cylinder from expanding gases immediately after the air/fuel mixture is ignited, which is about four times greater than compression pressure.

Combustion Process

During each combustion cycle, the spark plug ignites the air and fuel mixture in a process that is known as internal combustion.

Combustion Recess

An indented area on the rotor face where part of the burning of the air/fuel mixture occurs.

Comfort

A pleasing and enjoyable feeling due to the removal of excessive heat, moisture, dust, and pollen from the air.

Comfortron

A trade name for an early automatic-temperature-control system.

Common Point

A connection point, such as for several conductors or levers.

Communication

The transmission of information from one point, person or piece of equipment to another

Communications Protocol

The set of rules defining how information will be transferred . All communications between computers or other electronic devices require that the devices agree on the format of the data. The set of rules defining a format is called a protocol.

Commutating Pole

An electromagnetic bar inserted between the pole pieces of a generator to offset the cross magnetization of the armature currents.

Commutator

The name for the copper segment of the starter or generator that transfers electrical energy to the armature or rotor windings.

Compact High-pressure Tire

A term often used for compact spare.

Compact Spare

A weight- and space-saver tire, especially designed for temporary use.

Compact Spare Tire

A spare tire and wheel that is much smaller than the other tires on the vehicle, and is designed for short-distance driving at relatively low speeds.

Compact Tire

A term used for compact spare tire.

Companion Cylinders

Two cylinders in an engine that are at TDC at the same time.

Comparator

[1] An instrument for comparing specific critical measurements to a fixed standard [2] A circuit for comparing two input signals which may be ether analog or digital signals but the output will always be digital

Compensating Coil

A coil that serves to compensate for the mechanical friction in the moving coil of an electrical meter or gauge.

Compensating Port

A device used to maintain the proper level of brake fluid in the brake lines.

Complete Circuit

An uninterrupted electrical circuit or fluid circuit in which electrical current may travel to and from the battery, or fluid or vapor may circulate continuously through the system.