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Old 02-09-2008, 01:53 PM   #1
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Default Engine geeks heaven - BMEP

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:
Quote:
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.
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Old 02-09-2008, 02:44 PM   #2
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sweet graphs...

several modded motors that have been dynoed would do well on that graph

modded Picco P7R 69 oz/in
modded Picco P3 28 FTT 90 oz/in
modded Picco JLR .12 38.8 oz/in
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Old 02-09-2008, 03:21 PM   #3
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How'd you get 69 oz-in from a picco P7R?
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Old 02-09-2008, 04:20 PM   #4
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Quote:
Originally Posted by bozla View Post
How'd you get 69 oz-in from a picco P7R?
timing changes to both sleeve and crank, as well as a slight alteration of the transfer port shape.....And thats on AB Mods dyno, which tends to read a little lower then the XRC dyno
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