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Author Topic: Torque or Power ?  (Read 3090 times)

Offline BiPoLaR

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Re: Torque or Power ?
« Reply #135 on: January 26, 2011, 04:03:06 PM »
See Rule #4
« Last Edit: January 26, 2011, 04:07:12 PM by Skuzzy »
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Offline Skuzzy

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Re: Torque or Power ?
« Reply #136 on: January 26, 2011, 04:09:03 PM »
Quote from: ink on January 26, 2011, 04:00:55 PM
I got a question, what is the formula to get HP?   I was explaining the workings of a engine to my 14year daughter, and she asked me how Horse power is made, I guess someone told her it was how many horses could pull the car lol.....I dont know the exact math, something to do with the piston size, combustion chamber......????

There is no formula, I am aware of, for calculating the horsepower an engine will produce.  I would imagine it would be possible to produce a formula which could closely approximate the amoutn of horsepower, but that would include a number of variables most people would not have direct access to.
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Offline ink

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Re: Torque or Power ?
« Reply #137 on: January 26, 2011, 04:15:08 PM »
skuzzy~ I thought it had something to do with diameter of pistons,  Volume of cumbustion chamber, and size of valves....So how the heck do they get it?     Dyno?
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Offline Captain Virgil Hilts

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Re: Torque or Power ?
« Reply #138 on: January 26, 2011, 04:21:09 PM »
I already posted the formula for horsepower.

Horsepower = torque X RPM / 5252

There are various conversions, for example "kilowatts to HP" (because early engine dynomometers were "eddy current", meaning the engine was used to generate electricity to determine how much power it produced).

One horsepower is the power to lift a specified weight (550 pounds) one foot in one minute. Or about 750 Watts.

You use an engine dynomometer of some sort to measure torque and RPM, and the formula tells you what the HP is.

These days, the most common type of dyno is the water brake dyno, however the older eddy current dynos are still used, and the current "hot ticket" is the inertia dyno, which has a flywheel that the engine accelerates.
« Last Edit: January 26, 2011, 04:23:37 PM by Captain Virgil Hilts »
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Offline CAP1

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Re: Torque or Power ?
« Reply #139 on: January 26, 2011, 04:25:05 PM »
Quote from: ink on January 26, 2011, 04:00:55 PM
I got a question, what is the formula to get HP?   I was explaining the workings of a engine to my 14year daughter, and she asked me how Horse power is made, I guess someone told her it was how many horses could pull the car lol.....I dont know the exact math, something to do with the piston size, combustion chamber......????

CHECK THIS.

http://www.web-cars.com/math/horsepower.html
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Offline ink

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Re: Torque or Power ?
« Reply #140 on: January 26, 2011, 04:32:23 PM »
cool beans thanx guys
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Offline ink

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Re: Torque or Power ?
« Reply #141 on: January 26, 2011, 04:32:57 PM »
cool beans thanx guys
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Offline whiteman

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Re: Torque or Power ?
« Reply #142 on: January 26, 2011, 04:43:05 PM »
Quote from: ink on January 26, 2011, 04:15:08 PM
skuzzy~ I thought it had something to do with diameter of pistons,  Volume of cumbustion chamber, and size of valves....So how the heck do they get it?     Dyno?

My experience the only way to know is to Dyno it. Been to plenty of Dyno days and seen bone stock LS1 engines put out different numbers or cars with identical setups put out different numbers. Mine was 13 hp and 17 lb trq higher than what GM was stating it should be for a stock LS1. On the other end of the extreme scale was a guy that was only putting 10hp less then GM listed.
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Offline whiteman

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Re: Torque or Power ?
« Reply #143 on: January 26, 2011, 04:45:51 PM »
oops
« Last Edit: January 26, 2011, 06:23:39 PM by whiteman »
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Offline whiteman

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Re: Torque or Power ?
« Reply #144 on: January 26, 2011, 04:56:24 PM »
double  oops
« Last Edit: January 26, 2011, 06:23:31 PM by whiteman »
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