****************kW x 1200
BMEP = ---------------
****************litres x rpm
So 13.5 bar for you, F1 motors have something like 14.3.... but more rpm means more power. And basically that is where you are, you will only get more power if you pump more revs into it, but revs cost a lot and make failures more common. The stroking option may mean that you only have the same maximum power but your average power should be better.
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As for the 240BHP figure, given that a lot of those engines left the UK with 220BHP when they were built, and were running control cams, ECU, bodies etc, it would be very interesting to know where the 20BHP came from!
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THAT is why is said Horses come in different sizes!
Trust me, PM lofty as I said above, he will help you and he has done this exact exercise. Since he holds more Under 2 litre track records than anyone else I know he is doing something right. Even if you end up doing the same thing at least you know you have gotten an experienced opinion from a circuit racer.