Some of this will be general engine terms, not just abbreviations...If that sucks I or you can delete them...
4-stroke engine cycle=1 complete combustion cycle involves 4 piston strokes...1: Compression, 2: Power (expansion) 3: exhuast, 4:Intake (in that order, but not necessarily numbered that way)
Bore=Usually in mm's, some goofy dudes still use inches...Refers to the diameter of one cylinder of an engine...(not the piston, but the cylinder itself)
Stroke=The measurement of distance a piston travels in 1 movement (it can get confusing real quick, the stroke of the cylinder itself refers to the total vertical distance of a cylinder chamber...The piston stroke does not always use all the total space...In which case the total chamber length is irrelevant...The actual spec will involve the distance the piston travels within the cylinder)
Oversquare=Cylinder bore is greater than stroke
Undersquare=Cylinder bore is lower than stroke (the FS is undersquare)
Square=Cylinder bore is equal to stroke
Piston Dwell=Time in degrees of crank rotation that a piston is not moving while the crankshaft is still turning
Ignition Timing= Refers to when the plug is fired in relation to crankshaft location (location is termed in degrees of 0-360)
TDC=Top Dead Center...Refers to a piston at the top of a particular stroke (slated in degrees usually...It is not always precisely 1 degree do to the above mentioned piston dwell)
BDC=Bottom Dead Center...Refers to a piston at the bottom of particular stroke (same applies as above)
A-TDC=After Top Dead Center
B-TDC=Before Top Dead Center (both used for ignition terminology)
FMIC=Front Mount Intercooler
ECU=Electronic Control Unit
MAF sensor=Mass Air Flow sensor (3rd gen protege's have one)
MAP sensor=Manifold Absolute Pressure sensor (3rd gen protege's do not have one)
EGR=Exhuast Gas Recirculator
PCV=Positive Crankcase Ventilation
4-2-1 Header=exhuast manifold in which 4 pipes merge to 2, then merge to 1 (Some systems merge 4 pipes to 1 in one collector...i.e. 4-1 Header)
Mani=Generic for Manifold
TB=Throttle Body
VICS=Variable Intake Control System
VTCS=Variable Tumble Control System
CMP sensor=Camshaft Position sensor
CKP sensor=Crankshaft Position sensor
AFC=Air/Fuel controller (Apex'i universal system...superceeded by S-AFC-II)
FMU=Fuel Management Unit? not sure about that one...
FPR=Fuel Pressure Regulator
Oct rating=refers to Octane rating of gasoline
More ot come if you guys think this is helpful...i can better organize it or alphabetize it if needed...My above stuff is pretty mis-matched, I just need some time to straighten it out...
Just pm and I will add more...
