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Sonic Testing
A procedure for testing the integrity of engine blocks, using sound waves.
SOP
1. An acronym for standard operating procedure. 2. An acronym for seat of the pants.
SOP Rally
A competitive event in which instruments cannot be used by the contestant to check time or distance.
Sorbed
A desiccant.
Sorted Out
Corrected, such as a problem that has been corrected.
Soup
1. A special racing-fuel mixture. 2. To increase the output of an engine.
Source
The device, circuit or system which supplies electrical energy to another device, circuit or system.
Source Voltage
Voltage measured at the source with the circuit in operation.
South Pole
The pole or end at which magnetic lines of force enter a magnet.
Southern California Timing Association (SCTA)
A sanctioning body concerned with the annual Bonneville speed trials.
Space Frame
A light-weight race car frame constructed of small-diameter metal tubing that is welded together in such a manner as to provide high rigidity.
Space-saver Spare Tire
1. A deflated, compact spare tire that must be inflated to 35 psi (241 kPa) with a vehicle-battery powered air compressor or a can of compressed air. 2. An inflated spare tire which is smaller and narrower than those on the vehicle that is to be used in an emergency only.
Space-saver Tire
A term used for space-saver spare tire.
Spacer
A device, such as a shim or washer, that is used to increase the space between to mating surfaces for parts.
Spacer Entry EGR System
An EGR system where exhaust gases are routed directly from the exhaust manifold through a stainless steel tube to the carburetor base.
Span
The width of an air foil.
Spanner
The British term for wrench.
Spare
1. Not in regular use or immediately needed. 2. Extra or reserve. 3. A term used for spare tire.
Spare Tire
A full-sized replacement tire or a compact space-saver tire, generally for emergency service, but available for use when needed.
Spark Advance
The moving ahead of the ignition spark in relation to the piston position.