THREE-VALVE ENGINE: Describes an internal combustion engine comprising modules of two intake valves and one exhaust valve per cylinder. A four-cylinder three-valve engine is thus known as a "12-valve engine."

TIMING: Describes one of the essential features in an internal combustion engine that ensures that both valves are closed when the piston is in the compression stroke. If one or more valves remain open, the valve timing will be affected, and the engine will be considerably less efficient.

TRANSVERSE ENGINE: Describes a type of internal combustion engine, often found on cars with front-wheel drive, that is mounted laterally between the drive wheels.

TUNE: Describes the procedure of adjusting an internal combustion engine's controls, particularly its carburettor and timing, so that the engine will achieve maximum performance.

TWELVE-VALVE ENGINE: Describes a three-cylinder engine fitted with four valves per cylinder or a six-cylinder engine with two valves per cylinder or even a four-cylinder engine with three valves per cylinder.

TWIN CAM ENGINE: Describes an internal combustion engine fitted with twin overhead camshafts, mechanically coupled and balanced.

TWIN SWIRL COMBUSTION CHAMBER: Describes a type of four-stroke internal combustion engine, where the intake valves are arranged to ensure that the gas flow ends in two separate swirls, enhancing combustion levels of the fuel/air mixture within the cylinder.

UNDER SQUARE ENGINE: Describes a type of engine where the bore diameter is smaller than the stroke's length.

VEE ENGINE: Describes a type of internal combustion engine fitted with two banks of cylinders, each set at an angle to the other to form a "V" shape.

V-EIGHT(V-8) ENGINE: Describes a type of internal combustion engine fitted with eight cylinders set in two rows of four cylinders with a common crankshaft, shaped in the letter V.

V-FOUR ENGINE(V-4): Describes a type of internal combustion engine fitted with four cylinders set in two rows of two cylinders with a common crankshaft and shaped in the letter V,

V-SIX ENGINE (V-6): Describes a type of internal combustion engine fitted with six cylinders in two rows of three cylinders with a common crankshaft and shaped in the letter V

V-SIXTEEN ENGINE (V-16): Describes a type of internal combustion engine fitted with sixteen cylinders in two rows of eight cylinders with a common crankshaft and shaped in the letter V.

V-TEN ENGINE (V-10): in two rows of five cylinders with a common crankshaft and shaped in the letter V,

V-TWELVE ENGINE (V-12): Describes a type of internal combustion engine fitted with twelve cylinders in two rows of six cylinders with a common crankshaft and shaped in the letter V.

V-TWIN: Describes a twin-cylinder engine layout in which the cylinders form a "V".

V-TYPE COMPRESSOR: Describes a type of compressor where its pistons are arranged in a V-shaped configuration.

V-TYPE ENGINE: Describes a type of engine where the cylinders are placed in two rows set at an angle to each other with the crankshaft running through the point of the V. both banks of cylinders turn the single crankshaft.

WANKEL ENGINE: Describes a revolutionary design of rotary internal combustion engine invented by Felix Wankel that consists of an equilateral triangular member with curved sides orbiting about an eccentric on a shaft inside a stationary housing. The Wankel's advantages include compact size, lightweight and smooth operation because there are no reciprocating parts.

WEDGE: Describes a type of internal combustion engine using a wedge-shaped combustion chamber flatter on one end than the other.

W-ENGINE: Describes a rare interpretation of internal combustion engine design, similar to the V-engine, but fitted with two-cylinder rows instead of three,making for a shorter crankshaft and a noticeably short block. This compact construction allows a 12-cylinder W-engine to be transversely fitted in a mid-engine sports car.

X-TYPE ENGINE: Describes a type of internal combustion engine where the cylinders are set in four rows set at an angle from each other with a single crankshaft that runs through the intersection of the X and is turned by all banks of cylinders.

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