angusfaldo
Original Poster
2,678 posts
159 months

Anyone know how to calculate a power figure in KW from either BHP or ft/lb torque?


bad_roo
5,168 posts
122 months


c4koh
735 posts
129 months

Kilowatts are a measure of power. Power is how fast we can do the work, i.e. I could move 10 tonnes of rock!! but it would take me a long time... ergo, I am less powerful than a truck which could move 10 tonnes in much less time. So, in short: 1 horsepower is 550lbft/sec [i.e. the power to lift 550lb by 1 foot, each second] From here: www.pumaracing.co.uk/power1.htm 1 HP = 0.7457 KW / 1KW = 1.341 BHP (or in other words a 100HP engine is producing 74.57Kw of power, or a 100KW engine is producing 134BHP).


zaktoo
1,401 posts
125 months

angusfaldo said:Anyone know how to calculate a power figure in KW from either BHP or ft/lb torque? 
bhp to kW is straightforward  multiply your bhp figure by 0.7457. Remember that PS/CV/PK as used in mainland Europe is a slightly different figure than imperial bhp. Working from lbft, you can only get a figure for that specific RPM. This is almost certainly not what you're looking for, I suspect. Ciao Zak


c4koh
735 posts
129 months

zaktoo said: Working from lbft, you can only get a figure for that specific RPM. This is almost certainly not what you're looking for, I suspect. Ciao Zak 
Indeed: the torque (lbft) rating of a car doesn't have an "easy" correlation between that and power (either horsepower or KW, which are basically different units for the same thing). Maximum torque is usually not produced at the same revpoint as maximum horsepower either.

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ledaig
1,304 posts
147 months

I tend to use convert from here as it's free and fairly comprehensive: convertor


FourWheelDrift
61,201 posts
169 months


DennisTheMenace
15,580 posts
153 months

Sooo My 3kw rapid boil 1.8 litre kettle has roughly 4bhp ! not bad for a white good


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