4 Terms
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Automobile
Of or relating to any vehicle, usually designed to carry passengers, that operates on ordinary roads and typically has four wheels and a gasoline or diesel internal-combustion engine.
Industry: Automotive
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Automobile
Pent-roof
Automotive; Automobile
A combustion chamber whose upper surface resembles a shallow peaked roof. Usually used with four valves per cylinder.
Pitch
Automotive; Automobile
The rotation of a car about a horizontal axis, which causes its nose or tail to bob up and down. Dive and squat are pitching motions.
Planetary gears
Automotive; Automobile
A gearset in which all of the gears are in one plane, grouped around each other like the planets around the sun. The central gear is called the "sun gear." In mesh with it is a circular grouping of ...
Plenum chamber
Automotive; Automobile
A chamber, located between the throttle body and the runners of an intake manifold, used to distribute the intake charge evenly and to enhance engine breathing.
Polar moment of inertia
Automotive; Automobile
The resistance of an object to rotational acceleration. When the mass of an object is distributed far from its axis of rotation, the object is said to have a high polar moment of inertia. When the ...
Port fuel injection
Automotive; Automobile
A type of fuel injection with at least one injector mounted in the intake port(s) of each cylinder. Usually the injector is mounted on the air intake manifold close to the port. Port fuel injection ...
Pound-feet
Automotive; Automobile
The unit of measurement for torque. One pound-foot is equal to the twisting force produced when a one-pound force is applied to the end of a one-foot-long lever.
