The Real Way of Comparing Engine Designs Hmmm, reading reading reading ... okay the magic formula. (Brake Mean Effective Pressure) BMEP = ( kW x 1200 ) / ( litres x rpm ) okay, lets play. VH45 = ( 265 x 1200 ) / ( 4.5 x 5500 ) = 12.85 bar tuned NA zed (i.e. 120-135 rwkw) VG30-NA = ( 180 x 1200 ) / ( 3.0 x 6000 ) = 12.00 bar mildly tuned TT zed (i.e. 250 rwkw) VG30-TT = ( 330 x 1200 ) / ( 3.0 x 6000 ) = 22 bar a monster zed (i.e. 400 rwkw) VG30-XTT = ( 530 x 1200 ) / ( 3.0 x 6000 ) = 35.33 bar okay lets try a F1 car, think that is about 750 hp from 2.4 liters F1 = ( 560 x 1200 ) / ( 2.4 x 18000) = 15.55 bar Well that was fun and what did it prove ... nothing
I think you're a bit confused with regards to drivtrain losses... Unless I've read you incorrectly, but looking at your Monster Z you've shown a loss of 130 kw from the motor to the wheels. I also have no idea what this 'formula' is trying to prove... We all know that in the real world, a monster TT is faster than a mildly tuned one which is faster than a stock one which is faser than a VH45 which is faster than an NA VG... Unless you're trying to prove otherwise again with another cute formula??:rofl:
Read the article first, next time Read the article first ... not trying to prove anything just found the results interesting. Nothing to do with what is faster just what is more 'efficient' use of what is at hand.
Top Fuel, 8.1ltr, 8000rpm, 6000kw. 111.11 bar. And it's still only got 1 cam, 16 pushrods and 16 valves.
BMEP is mainly useful for comparing NA engines, it tells you how well they breathe but is usually expressed as a percentage. Its also useful when using a turbo simulator, one of the inputs required is BMEP expressed as a percentage.
