I never really thought about the term brake horsepower before, but in case someone is wondering how they measure it.
"Brake horsepower is measured by taking a drum filled with a fluid and attaching that to an engine. The power required to turn the drum is the brake horsepower - as the drum is ‘braked’ by the fluid."
Apparently they can do it via an electronic system now.
BMW aim for 100 BHP per 1000 cc, which is pretty efficient, but the M3 can push out 320 BHP from a 3 litre engine.
All this froma conversation yesterday with someone who tried to tell me that there is a direct mapping between cc and bhp. I didn't have the facts then, but I will if it ever comes up again....god I am a sad twat!!