DICTIONARY OF AUTOMOTIVE TERMS - "Sc"

SC:

Oil for 1964 and previous model years.

Scab corrosion:

A scab-like corrosion occurring along a scratch in a coating

Scale:

1. The accumulation of rust and minerals within the cooling system.
2. A weigh scale

Scale free system:

Eliminates deposits in condensers by picking up electrical energy from water, allowing deposits to be carried through the system and disposed.

Scale rust:

Loose, flaking rust

Scan:

A feature of modern radios which plays a few moments of each station before proceeding to the next one. Also called frequency scan button

Scan button:

A radio button which, when pressed, causes the tuner to scan the frequencies of stations with sufficient signal strength and plays that station for about 5 seconds before going to the next one. When the driver or passenger wants to listen to the currently played selection, he can press the same button (or a different one) to select that station. Also called frequency scan button

Scanimet:

A nickel-silicon-carbide coating for particularly wear-resistant cylinder walls. Compare Nicasil

Scanner:

See system scanner

Scan tool:

A device that interfaces with and communicates information on a data link

Scatter shield:

A steel or nylon guard placed around the bell or clutch housing to protect driver and spectator from flying parts in the event of part failure at high rpm. Such a shield is often placed around transmissions and differential units. See clutch explosion.

Scavenge:

A feature in a two-stroke engine to clear away, particularly to expel exhaust gas from a cylinder and to fill the cylinder with a fresh charge. These processes take place simultaneously in a two-stroke engine

Scavenger pump:

Mechanism used to remove fluid from sump or container.

Scavenging:

The removal of the exhaust gases from the cylinder by using the momentum of the exhaust gases in a long exhaust pipe or by taking advantage of the pressure waves set up in the exhaust pipe by the discharge of the gases.
Also See:
backflow scavenging
crankcase scavenging
cross scavenging
loop scavenging perfect scavenging
reverse-flow scavenging
reverse scavenging
schnürle scavenging tangential-flow scavenging
transverse flow scavenging
unidirectional flow scavenging
uniflow scavenging

Scavenging jet:

The jet of fresh charge supplied into the cylinder, the shape and direction of which determine the effectiveness of the scavenging process

Scavenging losses:

If the exhaust gases remain in the cylinder, they prevent a full charge of fresh mixture from entering; the power output is thus reduced

Scavenging passage:

The passage inside a two-stroke engine that serves to scavenge the exhaust gas from the engine; in most cases it refers to the transfer passage, as the gas column supplied across the transfer port initiates the scavenging process

Scavenging picture:

In experimental two-stroke engine development, a map of the scavenging air velocity distribution and the scavenging jet orientation inside a cylinder

Scavenging port:

See third scavenging port

Scavenging pump:

An oil pump in a dry sump system which returns oil from the crankcase to the main oil reservoir

Scavenging system:

A method used to accomplish the charge-changing process in a two-stroke engine

Scavenging valve:

In evaporative emission control systems, a valve in the purge line between the activated charcoal canister and inlet manifold which controls the purge air flow that regenerates the charcoal filter

SCC:

1. Acronym for spark control computer.
2. Acronym for safety compliance certification

Schematic:

A drawing system for portraying the components and wires in a vehicle electrical system using standardized symbols

Scheme:

See color scheme

Schneider:

See rochet-schneider

Schnürle scavenging:

See loop scavenging

Schrader valve:

1. A valve with a spring-loaded pin, in which the pin is depressed to open the valve. It is used at each automobile tire, most air conditioning systems, and on some fuel injection systems. Schrader is the original manufactureer of this type of valve.
2. A spring-loaded valve which permits air or fluid flow in one direction when a center pin is depressed and holds it back when a pressure difference exists.
3. A bicycle tire valve similar to the type found on automobile tires. Compare Presta valve.
4. A spring loaded valve, similar to a tire valve, located inside the service valve fitting to hold refrigerant in the system. Special adapters with built-in depressors must be used to attach service hoses to Schrader valves.

Scientific Research and Experimental Development Program:

(SR&ED) This program provides generous incentives for industrial research and development in Canada. The program allows individuals and companies to deduct 100 percent of qualified current SR and ED expenditures and capital SR and ED expenditures.

Scissors jack:

A device for lifting a corner of the vehicle. As it is applied, the arms are in the shape of the letter "X" or a diamond.

Scoop:

See:
airscoop
side scoop

Scooter:

1. A two-wheel motorcycle usually with a small engine and a step-through frame. Also see motor scooter.
2. A small three or four wheeled vehicle designed for a handicapped person and is usually powered by two 12-volt batteries (producing 24 volts).

Scope:

A colloquial term for oscilloscope

Score:

1. A scratch or groove on a finished surface. It is usually caused by dirt or some other object which mars the finish. Cylinder walls, for instance, can be scored by broken rings or a piston pin clip which has come loose.
2. (SCORE) An acronym for " Supplier Cost Reduction Effort."

Scored:

A brake disc that is scratched, grooved, or lined with small cuts

Scoring:

1. Grooves or deep scratches on a friction surface caused by metal-to-metal contact (worn-out brake pads or shoes) or debris caught between the friction material and the friction surface.
2. Irregular grooves in the friction surfaces of brake drums or rotors caused by contamination or worn-out linings.

Scotch yoke:

Mechanism used to change reciprocating motion into rotary motion or vice-versa. Used to connect crankshaft to piston in refrigeration compressor.

SCR:

Acronym for "Silicon Controlled Rectifier."

Scrap:

Waste metal

Scrap dealer:

A person or company which collects and recycles metal, especially from unusable vehicles.

Scraper:

See:
gasket scraper
ice scraper

Scraper ring:

An oil scraper ring

Scrap metal:

Metal from unusable vehicles

Scrap pile:

Discarded tire casings having service life exhausted through wear or damage.

Scrappage:

A vehicle registered in the previous year but not re-registered in the current year.

Scrap yard:

The premises of a dealer in scrap metal

Scratch:

See sand scratch

Scratches:

See sand scratches

Scratching:

See sand scratching

Scratch swelling:

See sand scratch swelling

Screamer:

Slang for a high-performance car, possibly due to the reaction of passengers with an over-enthusiastic driver.

Screen:

To shield from electrical interference.
Also See:
filter screen
oil screen
pick-up screen
split screen

Screen bulkhead:

Light nonwatertight transverse bulkhead fitted in some Great Lakes ore carriers

Screw:

1. A spiral path along a cylinder.
2. A fastening device. A screw is like an inclined plane wrapped up. It can take a rotating force and change it into a much larger straight-line force.

Also See:
adjusting screw
aiming screw
air bleed screw
air screw
allen screw
bendix screw
bleeder screw
bleed screw
bypass air screw capstan screw
countersunk screw
cross-head screw
edison screw
fast idle screw
fillister screw
grub screw
headlight adjusting screw
horsepower screw idle air bleed screw
idle mixture adjustment screw
idle mixture screw
idle speed screw
machine screw
metallic drive screw
mixture control screw
mixture screw
phillips head screw phillips screw
piston extension screw
robertson screw
self-tapping screw
speed screw
tappet adjusting screw
thread-cutting screw
valve adjusting screw
volume control screw

Screwdriver:

A device used to remove or install screws.
Also See:
angle screwdriver
ball end hexagon screwdriver
chubby screwdriver
cross-head screwdriver
cross-point screwdriver electrical screwdriver
electric screwdriver
flat-bladed screwdriver
flat-tip screwdriver
impact screwdriver magnetic screwdriver
offset screwdriver
phillips screwdriver
pozidriv screwdriver
ratchet screwdriver screw-holding screwdriver
stubby screwdriver
torque screwdriver

Screwdriver bit:

A hex shank with a screwdriver tip at one or both ends to loosen and tighten recessed screws; designed for use with magnetic or power-driven screwdrivers

Screw extractor:

A device used to remove broken bolts, screws, etc., from holes.

Screw-holding screwdriver:

A tool used to hold screws for easy placement in extremely tight places; also appropriate for loosening and tightening

Screw pitch gauge:

A measuring tool used to identify thread sizes, featuring a selection of blades with different thread profiles to determine screw pitch

Screw pump:

1. Compressor constructed of two mated revolving screws.
2. Pump having two interlocking screws rotating in a housing.

Screw starter:

A tool used to hold screws for easy placement in extremely tight places; also appropriate for loosening and tightening

Scribe:

To cut or scratch with a pointed instrument, e.g., (in) a painted surface, for testing purposes or to mark the position of a part

Scriber:

A pointed steel hand tool for marking metal

Scrivet:

A plastic screw-rivet which secures trim

Scrubber:

See:
chain scrubber
exhaust scrubber

Scrubbing:

A heavy wear on a tire caused by sliding sideways across the road surface, as when skidding

Scrub radius:

The distance from the point where the steering axis intersects the ground to the longitudinal line that runs through the center of the tire's contact patch. Also called "steering offset." See negative offset steering.

Scuff:

See tire scuff

Scuff plate:

1. Any protective plate.
2. The finishing trim on a door sill

Scuff rib:

The raised rib on the sidewall of a tire to protect it from impact with the curb

Sculpture line:

See swage line

Scuppers:

Drains from decks to carry off accumulations of rainwater, condensation, or seawater

Scuttle:

1. A small circular or oval opening fitted in decks to provide access.
2. A British term for cowl

Scuttle panel:

A British term for cowl

Scuttle section:

A subassembly of the body shell that includes the bulkhead, scuttle, and windscreen pillars; it is preassembled in the factory and spot-welded with the other subassemblies to form the body shell

Scuttle shake:

A typical shake exhibited by open cars on rough roads due to lack of torsional stiffness

Scuttle side panel:

A vertical panel at either end of the scuttle

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