Glossary “speed density” Definition:
A method of calculating airflow by sensing engine load and intake manfold pressure and other engine sensors.
s
specific gravity
Glossary “specific gravity” Definition:
Ratio of the weight of a given volume of a liquid divided by the weight of an equal volume of pure or distilled water. Water having a specific gravity of 1.00.
specific heat
Glossary “specific heat” Definition:
Quantity of heat required to change one pound of a substance by 1¡ãF.
specifications
Glossary “specifications” Definition:
Technical data, numbers, clearances, and measurements used to diagnose and adjust automobile components supplied by the manufacturer.
specialty shop
Glossary “specialty shop” Definition:
Term that may be used for specialty service shop.
specialty tire
Glossary “specialty tire” Definition:
Any of several types of tires such as, all-season tire, puncture-sealing tire, snow-and-mud tire, or studded tire.
spec
Glossary “spec” Definition:
Acronym form of Special.
specialty coatings
Glossary “specialty coatings” Definition:
A special class of coating that serve special needs on a vehicle. Such as, chip resistant coatings, flexible plastic coatings, low-gloss finishes, etc.
specialty repair shop
Glossary “specialty repair shop” Definition:
Term used for specialty service shop.
specialty service shop
Glossary “specialty service shop” Definition:
Repair shop that specialized in certain vehicle components, such as engine rebuilding, brake repair, radiator repair, and so on. Also known a specialty shop.
spatter paint
Glossary “spatter paint” Definition:
The technique of applying two separate colors of paint simultaneously to provide a speckled finish.
spd
Glossary “spd” Definition:
Speed
SPDT
Glossary “SPDT” Definition:
Single Pole Double Throw
Specialty Equipment Market Association (SEMA)
Glossary “Specialty Equipment Market Association (SEMA)” Definition:
A trade association for the automotive aftermarket industry.
spatter
Glossary “spatter” Definition:
The metal particles expelled during fusion welding that do not form a part of the weld.
SPARKADV
Glossary “SPARKADV” Definition:
Actual Spark Advance
spark retard
Glossary “spark retard” Definition:
Causing less spark advance to be added, resulting in a spark which is introduced later on the compression stroke
spark test
Glossary “spark test” Definition:
A quick check of the ignition system made by carefully placing a metal end of one of the spark plug wires close to the engine while cranking the engine to see if there is a spark gap and to determine its intensity.
spark plug resistor type
Glossary “spark plug resistor type” Definition:
A spark plug having an electrode resistance of 5,000 to 10,000 ohms to increase electrode life and suppress radio interference.
spark plug well
Glossary “spark plug well” Definition:
Recess in a cylinder head for a spark plug.