Engine:acronym-phrases

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Here is some common abbreviations. Know some other abbreviation? Please let us know :)


summary

There are many acronyms and phrases used relative to engine control. This page is a place were many of those acronyms can be written down for reference. Please try to keep this alphabetized for easier finding as you look down the list.

Acronyms

AFR

Air Fuel Ratio

AIT

Air Intake Temperature

BTDC

Before TDC, Before Top Dead Center

CAS

Crank Angle Sensor See http://en.wikipedia.org/wiki/Crankshaft_position_sensor

CLT

Coolant Coolant Temperature

CPS

Crankshaft Position Sensor

EDIS

todo

EGO

Exhaust Gases Oxygen, lambda sensor

IFR

Injector Flow Rate

IGBT

http://en.wikipedia.org/wiki/Insulated-gate_bipolar_transistor

IPW

Injector Pulse Width

MAF

Mass Air Flow

MAP

Manifold Air Pressure

NGC

Chrysler Next Generation Controller

PIP

Profile ignition pickup See http://en.wikipedia.org/wiki/Profile_ignition_pickup

RUSEFI

Really Uber Simple EFI? Robust Ultra Simple EFI? Retarded Unproven Shitty EFI?

Please suggest your version.

Sequential

Often this means Sequential injection, which means the injectors start the fuel pulse at a specific crank angle. This can be handy for engines that inject direct into the cyl when the valve is open. If an engine can inject direct into the cyl, it will have minimal delays caused by wetting the walls. Also sequential is required for direct injection engines like common rail diesel.

SD

Speed Density this is a method of predicting how much fuel should be delivered to an engine. This is a MAP based system which uses pressure to make a prediction of how much O2 is entering the cyl.

Staged injection

The use of 2 injectors for one cyl. This commonly means at low RPM and lower loads, one injector is turned on which allows for finer control over idle fuel delivery, while at higher RPM and higher Loads both injector inject fuel which allows for larger amounts of fuel to be delivered.

TDC

Top Dead Center

TFI

Thick Film Ignition - Ford distributor

VE

Volumetric Efficiency i.e. 0.8 (for 80%)

VOL

engine volume

WOT

Wide Open Throttle

Phrases

Twirling the Iron

Wrenching on your vehicle, often used when changing a tire, but has been commonly used other times when you are doing heavy wrench work.

Green Brown Green

A rally term that that reminds you the proper way to drive. Green is trees or vegetation, which you don't want to drive in, Brown or Black is the road where you want to be, so it's preferred if brown and black are in the middle.

In like a lamb, out like a lion

Term about approaching quietly, then tearing though a closed stage like a beast. Usually credited to John Buffum. But it was probably Tom Grimshaw that actually penned the words to summarize John's philosophy.