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Slip Rings

The electrical contact area for the brushes in an alternator.

Slip Stream

A partial vacuum that is created behind a vehicle traveling at a high speed.

Slip Yoke

A component having internal splines that slide on the transmission output-shaft external splines, allowing the drive line to adjust for variations in length as the rear axle assembly moves.

Slip-in

A part that fits without modification or adjustment.

Slipout

A condition that occurs with a tractor-trailer when pulling with full power or decelerating with the load; tapered or worn clutch teeth tend to "walk" as they rotate, causing the sliding gear and clutch to slip out of engagement.

Slipper Skirt

A term used for slipper skirt piston.

Slipper Skirt Piston

A piston that has a cutaway skirt so that the piston can come closer to the counterweights reducing the overall size of the engine. Also known as slipper skirt.

Slippery

A streamlined, aerodynamically efficient vehicle.

Slope

The numerical ratio or proportion of rear drum brake pressure to full system pressure that is applied through a proportioning valve.

Sloper

A fastback body type.

Slow Reverse

A simple planetary gear combination with sun gear as input, planetary carrier held, and ring gear as output.

Sludge

1. A muddy-appearing deposit formed by contamination and chemical action on liquids; can clog openings and/or passages 2. A buildup of combustion by-products that can clog oil lines and interfere with proper lubrications.

Slug

A piston.

Slugging

1. The return of liquid refrigerant or oil to the compressor. 2. The act of adding a separate piece (s) of material in a joint before or during welding that results in a welding joint not complying with design, drawing or specification requirements.

Slush Pump

An automatic transmission.

Sm

Samarium An element with the atomic number of 62.

Small Block (SB)

A V-8 engine of 400 cid (6.5 liters) or less.

Smart Card

A small electronic device about the size of a credit card that contains electronic memory.

SMEC

Single module engine controller.

Smog

Air pollution, especially the photochemical variety formed when sunlight causes a chemical reaction between NOx and HC, resulting in the formation of ozone and other compounds smog is a conjunction of smoke and fog.