I'm trying to get a grip of 2 stroke engines, so here are some BMEP figures that I've just calculated.
According the the two stroke tuners handbook (Gordon Jennings) 115 psi
would have been a decent BMEP of the time (early 70's?).
For those of you who know nothing about BMEPs please go here : http://www.epi-eng.com/ET-BMEP.htm
I shall quote from the page about engines from F1:
How does it perform? At the end of the 2006 season, the engines were producing in the neighborhood of 840 HP at 9000 RPM (and could produce more at 10,000 RPM, but engine RPM has been restricted by means of a rule limiting the final drive ratio at each venue). 840 HP at 9000 RPM requires 490 lb-ft of torque, for a peak-power BMEP exceeding 206 PSI. Estimating that peak torque is 550 lb-ft in the neighborhood of 7800 RPM, yields a peak BMEP of nearly 232 PSI.
I've calculate the BMEPs for some RC engines:
Wow! Some of the higher spec engines are getting on for F1 standard, and even the lower spec ones are very impressive.