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HORSEPOWER & TORQUE #250628 Aug 15, 8:22pm Aug 15, 8:22pm
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Haulin_A_Doo OP
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HORSEPOWER & TORQUE
Horsepower is defined as 33,000 foot pounds of work per minute.

When dealing with automotive engines. You need to measure units of force from rotating objects such as crankshafts. So, you use terms which define a "twisting" force, such as foot pounds of torque. A foot pound of torque is the "twisting" force necessary to support a one pound weight on a weightless horizontal bar, one foot from the fulcrum.

Now you need to visualize that one pound weight, one foot from the fulcrum on its weightless bar. If you rotate that weight for one full revolution against one pound of resistance, you have moved it a total of 6.2832 feet (Pi X a two foot circle). You have also done 6.2832 foot pounds of work.

As stated above, 33,000 foot pounds of work per minute is equivalent to one horsepower. That was definition was formulated by a man by the name of Watt.

If you divide the 6.2832 foot pounds of work you've done per revolution of that weight into 33,000 foot pounds, you come up with one foot pound of torque at 5252 rpm's is equal to 33,000 foot pounds per minute of work. That is the equivalent of one horsepower. If you only move that weight at the rate of 2626 rpm, it's the equivalent of 1/2 horsepower (16,500 foot pounds per minute). SOOOO, the following formula applies for calculating horsepower from a torque measurement:

Horse Power = Torque X RPM / 5252

Torque is the only thing you feel in a car. Horsepower is just sort of a generic comparison. 300 foot pounds of torque will accelerate you just as hard at 2000 rpm as it would if you were making that torque at 4000 rpm in the same gear. If you put it in the formula, the horsepower would be "double" at 4000 rpm; therefore, horsepower isn't particularly meaningful from a driver's perspective. The two numbers only get closer at 5252 rpm, where horsepower and torque always come out the same.

Re: HORSEPOWER & TORQUE [Re: Haulin_A_Doo] #250629 Aug 15, 8:25pm Aug 15, 8:25pm
Joined: Jun 2004
Posts: 380
WV, USA
Shiftyz1x
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2003 Toyota Celica GT
Shiftyz1x
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WV, USA
wow never thought of that...makes sense though... thumbsup

Re: HORSEPOWER & TORQUE [Re: Shiftyz1x] #250630 Aug 15, 8:47pm Aug 15, 8:47pm
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O.C. California
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Especial187
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2000 Toyota Celica
Especial187
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O.C. California
Well then what can I do to get more low end tourqe? I have an Injen Intake and it feels like I have no torque till I get up to high third.

Re: HORSEPOWER & TORQUE [Re: Especial187] #250631 Aug 15, 8:50pm Aug 15, 8:50pm
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Haulin_A_Doo OP
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Boost thumbsup

Re: HORSEPOWER & TORQUE [Re: Haulin_A_Doo] #250632 Aug 15, 9:18pm Aug 15, 9:18pm
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2002 Super White Toyota Celica
ravertony
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a bit confusing but helpful.. wish our cars had better low end

Re: HORSEPOWER & TORQUE [Re: ravertony] #250633 Aug 15, 9:55pm Aug 15, 9:55pm
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oas
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oas
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eek thumbsup

Re: HORSEPOWER & TORQUE [Re: oas] #250634 Aug 15, 10:09pm Aug 15, 10:09pm
Joined: May 2003
Posts: 5,346
LA
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spaztikid
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1974 Toyota Celica
spaztikid
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dikitzaps
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yeah no shit

Re: HORSEPOWER & TORQUE [Re: spaztikid] #250635 Aug 15, 11:02pm Aug 15, 11:02pm
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Haulin_A_Doo OP
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Its elementary my dear Watson. laughsilly

Re: HORSEPOWER & TORQUE [Re: Haulin_A_Doo] #250636 Aug 15, 11:24pm Aug 15, 11:24pm
Joined: Oct 2003
Posts: 1,864
CA
stefanoc
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2002 Toyota Celica
stefanoc
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CA
confusing, but meaningful. you cant understand it reading it once i suppose.

Re: HORSEPOWER & TORQUE [Re: stefanoc] #250637 Sep 9, 2:57pm Sep 9, 2:57pm
Joined: Sep 2004
Posts: 353
Manchester UK
Akita
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2001 Toyota Celica GT
Akita
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2001 Toyota Celica GT

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Posts: 353
Manchester UK
so what does the "Brake" in BHP signify? spineyes

Re: HORSEPOWER & TORQUE [Re: Akita] #250638 Sep 9, 4:45pm Sep 9, 4:45pm
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Haulin_A_Doo OP
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I think it a method of measuring it. Braked horsepower? They use a braking device to resist the motor & measure it? I donno ... confused

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