DRIBBLEInsufficiently atomized fuel issuing from
the nozzle at or immediately following the end of
DRIVABILITY The general operation of a vehicle,
usually rated from good to poor; based on
characteristics of concern to the average driver,
such as smoothness of idle, even acceleration,
ease of starting, quick warm-up, and not
modification added to or designed into a motor
vehicle for the purpose of reducing air-polluting
ENERGYThe ability or capacity to do work.
ENGINEA machine that converts heat energy into
ETHYLENE GLYCOLA solution added to
antifreeze to help prevent freezing.
EVAPORATIVE CONTROL SYSTEMA system
that prevents the escape of fuel vapors from the fuel
tank or air cleaner while the engine is off. The
vapors are stored in a charcoal canister or in the
engine crankcase until the engine is started.
EXHAUST EMISSIONSPollutants emitted into the
atmosphere through any opening downstream of
the exhaust ports of an engine.
EXHAUST-GAS ANALYZERA device for sensing
the amounts of air pollutants in the exhaust gas of a
EXHAUST-GAS RECIRCULATION (EGR)
SYSTEMAn NOx control system that recycles a
small part of the inert exhaust gas back through the
intake manifold to lower the combustion
EXHAUST MANIFOLDThe part of the engine that
provides a series of passages through which burned
gases from the engine cylinders may flow to the
EXHAUST PIPEThe pipe connecting the exhaust
manifold to the next component in the exhaust
EXHAUST STROKEWhen the exhaust gases from
the cylinder are removed via the exhaust valves.
EXHAUST SYSTEMThe system that collects the
exhaust gases and discharges them into the air.
Consists of the exhaust manifold, exhaust pipe,
muffler, tail pipe, and catalytic converter (if
EXHAUST VALVEThe valve that opens to allow
the burned gases to escape from the cylinder during
the exhaust stroke.
EXPANSION TANKA tank connected by a hose to
the filler neck of an automobile radiator; the tank
provides room for heated coolant to expand and to
give off any air that may be trapped in the coolant.
F-HEADA type of engine with the valves arranged to
form an F; one valve is in the head, the other in the
FANThe bladed device in back of the radiator that
rotates to draw cooling air through the radiator or
around the engine cylinders.
FAN BELTA belt (or belts), driven by the crankshaft,
whose primary purpose is to drive the engine fan
and water pump.
FIRING ORDERThe order in which the engine
cylinders deliver their power strokes.
FLOAT BOWLIn the carburetor, the reservoir from
which gasoline feeds into the passing air.
FLOAT LEVELThe float position at which the
needle valve closes the fuel inlet to the carburetor to
prevent further delivery of fuel.
FORCEThe action of one body on another tending to
change the state of motion of the body acted upon.
Force is usually expressed in pounds.
FOUR-STROKE CYCLE ENGINEAn engine that
requires four piston strokes (intake, compression,
power, exhaust) to make a complete cycle of events
in the engine cylinder.
FRICTIONThe resistance to motion between two
bodies in contact with each other.
FRICTION BEARINGA bearing having no
moving parts. The shaft that rotates simply rubs
against or rides on a thin film of oil between the
bearing and shaft.
FUELThe substance that is burned to produce heat
and create motion of the piston on the power stroke
of the engine.