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Sprung Weight

The mass of the vehicle that is supported by the springs, including the body, engine and transmission.

SPS

1. An abbreviation for Speed Sensitive Power Steering or Speed Pro Steering (Chrysler) (2) An abbreviation for Service Programming System (used by GM ).

SPST

Single pole single throw.

Spun Bearing

Any bearing on the crankshaft that has seized on the journal and turned in the housing bore.

Spur Gear

A transmission or differential gear having teeth cut straight across its face, parallel to the rotational axis.

SPX

[1] A tool and equipment manufacturer.

Spyder

1. A light, two-person, horse-drawn carriage. 2. A light, two-person roadster.

Square Engine

An engine in which the bore and stroke dimensions are the same.

Square Wave

A repetitive waveform whose shape is essentially square or rectangular, usually with equal on and off times.

Square-cut Piston Seal

A fixed seal for a caliper piston that has a squar cross section.

Squarely

Poor handling.

Squash Area

A term used for quench area.

Squeak

A high-pitched noise of short duration.

Squeegee

1. A flexible rubber block used to apply glazing putty and light coats of body filler. 2. A metal-backed rubber blade having a handle used to clean windshields.

Squib

A pyrotechnic term used for a fire cracker that burns but does not explode. The squib starts the process of air bag deployment.

Squirrel

A driver that cannot handle a vehicle very well.

Squirt Hole

1. A hole in the side of a connecting rod in an OHV engine which squirts oil toward the camshaft. 2. A hole in the pin end of a connecting rod to squirt oil to the underside of a piston for cooling.

Squirt Racing

A term used for drag racing.

Squish

The action where some compressed air/fuel mixture is pushed out of a decreasing space between the piston and cylinder head of the combustion chambers in some engines.

Sr

[1] Strontium An element with the atomic number of 38 [2] An abbreviation for street roadster.