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| TECH CENTER - Tech Discussion - Computing HP and Torque
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TECH DISCUSSION
COMPUTING HP AND TORQUE
FORMULA FOR HPQ
| HPQ = (0.00426 X MPH)3 X WEIGHT |
HPq = Engine horsepower required to reach MPH in quarter mile
Note: Understates HP required at speeds exceeding 100 MPH.
Note: Assumes engine HP must be 2 x the HP required at drive wheels.
Example: What engine HP is required to achieve 110 MPH in a 3200 pound
vehicle in 1/4 mile?
HPq = (0.00426 x 110) x (0.00426 x 110) x (0.00426 x 110) x 3200
HPq = 329
FORMULA FOR HP AND TORQUE
| HP = TORQUE X RPM ÷ 5252 • TORQUE = HP x 5252 ÷ RPM |
Example: What torque is required to generate 329 HP at 6000 RPM?
T = 329 x 5252 ÷ 6000
T = 288 foot pounds @ 6000 RPM
Example: What torque is required for 296 HP at 4880 RPM?
T = 296 x 5252 ÷ 4880
T = 319 foot pounds @ 4880 RPM
Please Note: The above equations and rules apply only to four-cycle engines. The equations have been simplified for ease of understanding. Answers will be approximate but generally will be close enough for use as a guideline.
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