Tidgy

whats the difference between the two?

i've been told the bhp is calculated in such a way that it comes out much high than uk bhp, is this true? and if so whats the conversion factor between us and uk bhp?

David Lock

Power is the same everywhere. But some comments here.

USA bhp versus UK bhp - FordMuscle.com Forums

USA Octane rating IS different though.

dl

Dracoro

Have fun: Horsepower - Wikipedia, the free encyclopedia

BHP = (Torque * Revs) / 5252

e.g
(200 * 6500) / 5252 = 247 BHP
or for a lower torque but higher revving motor
(150 * 8650) / 5252 = 247 BHP

myblackwrx

iTrader: (1)

i thought the Yanks worked out their ratings differently

we use the RON rating but i thought they used RON+MON/2 to put on their pumps.

David Lock

Yeah - I think that's the case. Perhaps they don't use the word RON as such? dl

Mother Theresa

Americans tend to use wheel horse power rather than our fudge factors to guestimate engine horse power.

p1mark

You have metric horsepower to a DIN /SAE standard - which is referred to as PS generally.

Then you have good old fashioned BHP which we all talk about which is actually 0.98632 of a PS. or 550 ft-lbf/s (foot pounds force per second)

As Normal the UK and America are in the dark ages as we should really use PS.

Then you have 2 more Horsepower figures which are not commonly used these days. An electical HP (0.98592 PS) and a water HP (0.98586 PS)

There is nothing like the difference the american guy says though in all 4 horsepower variants. I can only think he is talking about the difference beween metric and Brake horsepower but has his figures wrong.

dunx

iTrader: (3)

IMO it's just wheel horsepower VS flywheel mine made 280 whp at 4800 rpm, and this could be calculated to mean about 350 bhp at the flywheel.

Not many people put their engine on a dynamometer to get a true flywheel figure, hence the estimates from rolling roads, or a laptop on the road.

Most of them are probably just "*****-waving", mine's bigger than yours....

DunxC

Tidgy

i asked due to having a general look round, and alot of poeple (mainly on nasioc) in america were getting datf bhp figures, and i couldn't understand how, then someone mentioned its worked out differently

SqeekyMclean

Just watch this YouTube - Top Gear - Mustang GT500 Rolling Road

You know yanks are full of hype most of the time