[stovie]

Thanks occasionally6 you reminded me of something important! On the air engines they had it had a really high cr, not that that maters in a air engine but if you look at it you find that the air used to the power gained is pretty high. For example you take a cr of 16-1 at a starting pressure of 15psi at BDC you'll need about 240psi at TDC, which is a mbep of 60 which is also 1/4 the air isn't it?? So if I wanted a mbep of 5 then I'd need 20 psi which then gives a BDC pressure of about 1.25psi. And if you some how had a 32-1 cr engine then for a mbep of 5 you'd need I think 40psi but for that little bit I'd have about 2/3 the torque am I right or am I getting it messed up here???