Terms

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Page created by T Dec 11th 2005:

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Term	Description
AKA	Also Known As
ATF	Automatic Transmission Fluid
Blow-By	Combustion gases that are blown past the pistons and into the sump
Brinelling	The process of pressing an indentation into a metal to display how hard it is. Named after the test's inventor.
CDI	Capacitive Discharge Ignition: An Ignition System that uses an Inverter to boost the Battery 12v to 300V and stores the Voltage in a bank of Capacitors. When triggered the Capacitor charge is dumped across the Coil Primary Winding which generates an intense Spark at the Secondary Winding as a result of the high Rise Time of the Primary Voltage. Preferred in Two Stroke environments where Plug Fouling is a major consideration. Has short Spark Duration.
CFS	Cold Feed Switch
Core Shift	A term that describes distortion that has occurred during the casting process.
Cum-Adore	Endearing expression for a post Kingswood Holden.
Detonation	The Fuel Charge burns faster than it is supposed to
Diff	Short for Differential. The Differential is a gearset located in the Rear Axle that allows each Axle to turn at the differing speeds necessary for the Car to make a turn properly. Without a Differential steering a Car would be impossible. The Car would only travel in the straight ahead position. Originally invented by the Chinese as a Compass that would point North irrespective of the direction the device was rotated to.
ECU	Electronic Control Unit
EFI	Electronic Fuel Injection
EST	Electronic Spark Timing (Only fitted to the 6 Cylinder Carburettor VK)
Flare-Up	This occurs when a high speed Kick Down to Second Gear occurs and the diff ratio is too low
FYI	For Your Information
HEI	High Enegry Ignition: A system that provides the spark duration of the old points system with the powerful spark of Capacitive Discharge Ignition.
Hy-dramatic	Endearing alternative name for GMH's first automatic gearbox, Hydramatic.
Nearside	Kerbside of the Car
NS	Near Side. The side nearest the kerb.
Offside	Driver's Side of the Car
OS	The side away from the kerb, the Driver's side.
PCV	Positive Crankcase Ventilation
Plug Fouling	The 2 Electrodes on the Spark Plug have material lying across them. The material shorts them out and prevents them from sparking properly or even sparking at all.
Points-Bounce	When the Breaker-Points used in early distributors shut at high speed they bounce causing premature and weak spark.
Pre-Ignition	The Combustion Process is initiated before the Spark Plug sparks. Can be caused by glowing particles in the Combustion Chamber and that includes deposits on the Spark Plugs. Can also be caused by Fuel with too low octane rating.
Radio Frequency Spatter	Electrical interference caused by high voltage discharge. The undesirable crackle heard in the radio.
Re-Bore	The cylinders have to be machined out to a larger size and larger pistons fitted with new piston rings.
Re-Ring	If the pistons and bores are not too worn, then only the piston rings may need replacing
TDC	Top Dead Centre - The piston is at the very top of its travel.
TGS	Top Gear Switch
TPS	Throttle Position Switch as used on EFI VK Commodores.
Tin Wear	Rocker Covers or Side Covers
Trimagic, Traumatic	Terms of Endearment
VAC	Vacuum Advance Control
WRT	With Respect To