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

Exhaust valve: The valve through which the burned fuel charge passes on its way from the cylinder to the exhaust manifold. It is driven by the camshaft. When comparing an exhaust valve with an intake valve in the same engine, the part of the exhaust valve that seats into the head (i.e., not the stem) will have a smaller diameter than the intake valve.

Expander: A ring placed under a piston ring to increase ring pressure on the cylinder walls. For instance an oil control ring may have an expander ring to assist the oil-control ring to scrape oil off the cylinder wall and provide further sealing. See piston ring expander.

Expansion: An increase in size, for example: when a metal rod is heated, it increases in length and perhaps also in diameter. Expansion is the opposite of contraction. Also see piston expansion.

Expansion plug: See core plugs.

Expansion tank: When the engine is heated, the coolant expands to fill any available space (usually in the radiator). Before the introduction of coolant expansion tanks, the excess coolant was forced out of a vent tube and on the ground. The expansion tank collects the coolant so that when the engine cools off, the resultant vacuum sucks the coolant from the tank back into the radiator.

Expansion valve: A part of an air-conditioning system, located between the condenser and the evaporator, that regulates the flow of liquid refrigerant to the vaporator. If cooling needs are low, the valve is almost closed; as additional cooling is required, the valve opens wider so that more liquid refrigerant flows to the evaporator.

Explosion: A rapid disintegration of an object. See clutch explosion.

Ext: Abbreviation for "exterior."

Extension spring: A closed-coiled helical spring that offers resistance to a pulling force.

External combustion engine: An engine that burns its fuel outside the engine. A steam engine is an external combustion engine.

Extractor: A device for removing some object. See screw extractor.

Extreme-pressure lubricant: (EP lubricant) A lubricant designed and compounded to withstand very heavy loads imposed on gear teeth.

Extruder: A machine that shapes a rubber compound into a usable form. Uncured rubber is heated to soften and forced through dies having the desired shape and dimensions.

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