HI,

 

I have heard there is a difference between US and UK BHP anybody know the calculation to get relative figures?

I hear it is only the US Manual which is the full 300bhp

Originally posted by TopLess

HI,

 

I have heard there is a difference between US and UK BHP anybody know the calculation to get relative figures?

 

I think in the US they double everything and add a little more for good measure

 

Ummm does that sound like someone else 403bhp :rofl: :rofl: :rofl:

Originally posted by bagins

I think in the US they double everything and add a little more for good measure

 

Ummm does that sound like someone else 403bhp :rofl: :rofl: :rofl:

 

 

LMAO:D :D

:D I think they actually took off a bit ;)

Originally posted by pete shrimp

:D I think they actually took off a bit ;)

 

No comment :mad: :eek: :slap:

EErrr OK to clarify things a bit further!

 

 

I don't want the difference between UK and US Zed's BHP figures,

but the differance between how UK and US BHP figures are calculated and the formula to compare them?

I really dont get what you mean.

 

How can you compair 2 power? Its like compairing a pint of water with half a pint of water.

I have heard the way the yanks calculate bhp is a slightly different formula to the british one. I am trying to find out whether this is not a rumour and is correct!

 

If it is correct then what would be the formula to compare them?

A US horse has the same power as a UK horse - but not, strangely, a German one.

 

1 horsepower = 550 foot-pounds per sec. Or for youngsters, 745.699 watts.

 

1 pferdestärke = 735.49875 watts

 

Which explains why all bike manufacturers used to quote bike hp as ps. The german horse being smaller, the figure was bigger.

 

The difference Mark is talking about with US SAE is in how they measure the hp.

 

bhp - or brake horsepower - is the measure of how much power you have to use to stop an engine turning (i.e. the same as how much it is developing). Unscrupulous motor manufacturers realised that if you took all the accessories of an engine: alternator, a/c, p/s pump etc etc etc off it, you would have to use more power to stop it - hence your hp figure would be bigger.

 

The SAE specified a "real-world" way to measure the hp so it would be common across manufacturers and not be open to abuse.

 

So the yanks calculate hp the same way we do - but slightly different to the Germans / continentals.

 

More details

http://www3.sympatico.ca/al.vilcius/bikes/power.htm

http://www.corridor-o.com/html/kids/html/horses.html

http://www.musclecarclub.com/library/dictionary/engine-terms.shtml

http://en.wikipedia.org/wiki/Horsepower

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

 

Cheers - Gio

(ex physicist)

Don't the americans correct to different STP than us?

Their power figures always look inflated anyway. Also they quote hp not bhp, don't know if that's a differenct in its self though?

I think they use retired asthmatic pit ponies and we use thoroughbred stallions ! :D