What is Head-Quarters USA?
Head-Quarters began in 1969 with Doug Coffey and a vision. Since then, the demand for Doug's special blend of high performance and dependibility has been overwhelming. Head-Quarters USA was established in order to better serve the needs of retail customers in the US. Nothing else has changed...same great products by the same great company. Welcome to Head-Quarters USA.Math Formulas
THE FORMULAS ON THIS PAGE WILL HELP YOU CALCULATE SOME OF THE NECESSARY INFORMATION USED TO WORK OUT ENGINE COMBINATIONS
Calculators under construction...come back soon.COMBUSTION CHAMBER VOLUME
cylinder swept volume / (compression ratio - 1)
COMPRESSION RATIO
(cylinder volume + chamber volume) / chamber volume
TORQUE
(5250 x horsepower) / RPM
HORSEPOWER
(RPM x torque) / 5250
BHP LOSS
(elevation in ft x .03 x bhp at sea level) / RPM