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| POWER is the amount of work (ft. lbs.) that can be done per minute. POWER = WORK/TIME One HORSEPOWER is equal to 33,000 ft. lbs. of work per minute. 550 ft. lbs. of WORK per second or 1,980,000 ft. lbs. of work per hour. WORK = FORCE x DISTANCE WORK is the amount of force required to move an object a certain distance. TORQUE = Turning force ---- TORQUE is equal to the force times the crank radius measured in (lbs.- ft). TORQUE BACKUP or TORQUE RISE is the % of RPM drop before reaching PEAK TORQUE. PEAK TORQUE is the the point at which the pump reaches maximum fuel delivery. (EXAMPLE) A vehicle is rated
350 HORSEPOWER @ 2100RPM. THe vehicle is currently using all the
HORSEPOWER it can develop to pull the load at 2100RPM. The road
begins to start a slight incline. As the vehicle travels up the
incline RPM will drop, as RPM drops the TORQUE BACKUP will increase
fuel delivery and try to hold RPM. As the incline steepens the
RPM drops more until PEAK TORQUE is reached. After reaching PEAK
TORQUE, RPM will drop dramatically which normally requires a gear
change to raise the RPM back to torque range. Lugging an engine
occurs when a vehicle is constantly driven in the TORQUE RANGE
whether it is from improper shifting or overloading.
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