SCAVENGE PUMP
A pump used to return draining oil from a turbocharger to the crankcase of the engine.
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SCREW COMPRESSOR
A supercharger that uses large intertwining screws instead of rotors to draw in and compress air.
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SHORT SHIFTING
Shifting gears early in order to control wheel stands or wheel spin.
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SLIDE CARBURETOR
A carburetor that uses a flat or round slide for throttle control. A non-CV type carburetor.
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SLIDING VANE COMPRESSOR
A supercharger that has one offset rotor that contains blades (vanes) that trap and compress air.
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SPEED-DENSITY EFI
An electronic fuel injection system that is preprogrammed to a set of rpm, load and throttle angle (N-Alpha) values which totally control fuel delivery.
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SPOOL-UP TIME
Also called turbo lag time. The time it takes a turbocharger to get up to speed.
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STAGNATION ZONE
The location on a moving vehicle where maximum pressure is obtained for a ram air system. Usually dead center of a motorcycle's fairing.
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STOICHLOMETRY
The determination of proper proportions of components for chemical reactions, as in the ideal air/fuel ratio for combustion.
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SUPERCHARGER
A mechanically driven air pump.
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