ABBREVIATIONS and SYMBOLS
Across flats (bolt size)...........................................AF
After Bottom Dead Center.....................................ABDC
After Top Dead Center..........................................ATDC
Alternating current................................................AC
Ampere..................................................................Amp
Ampere-hour..........................................................Amp hr
Atmospheres...........................................................Atm
Before Bottom Dead Center....................................BBDC
Before Top Dead Center.........................................BTDC
Bottom Dead Center...............................................BDC
Brake mean effective pressure................................BMEP
Brake horsepower..................................................BHP
British Standard (tread pitch).................................BS
Carbon Monoxide...................................................co
Centimeter..............................................................cm
Degree (angle or temp)...........................................Deg or "o"
Diameter.................................................................dia
Direct current.........................................................DC
Double Overhead Camshaft....................................DOHC
Ducati.....................................................................Duc
Energy Transfer......................................................ET
Fahrenheit...............................................................f
Feet.........................................................................ft
Feet per minute.......................................................ft/min
Fifth.......................................................................5th
Figure (illustration or photo)...................................Fig.
First........................................................................1st
Fourth.....................................................................4th
Gallons (US)...........................................................Gal.
High Compression...................................................HC
High Tension (plug wire).........................................HT
Internal Diameter.....................................................ID
Inches......................................................................in. or
Italy.........................................................................Ita
Low Compression....................................................LC
Maximum................................................................Max
Millimeter...............................................................mm
Miles per hour.........................................................mph
Minimum................................................................Min
Narrowcase..............................................................NC
Ohms......................................................................ohm
Outside Diameter....................................................OD
Overhead Camshaft.................................................OHC
Part Number............................................................Part #
Ratio........................................................................ :
Revolution Per Minute............................................RPM
Second....................................................................2nd
Third.......................................................................3rd
Top Dead Center.....................................................TDC
Triumph..................................................................Tri
Twin Carbs.............................................................TC
United Kingdom......................................................UK
Volts........................................................................V
Watts.......................................................................W
West Coast British Racing.......................................WCBR
Widecase..................................................................WC