240 Blaster compression on pump gas?

[Sticker Otis]

Rebuilding a 240 blaster and need to know psi I can get to and be safe with pump gas. Also, what kind of psi increase can I expect when the rings seat?
Thanks
Otis

[79vwrabbit]

Static compression-measured with a gauge by kicking the engine over-I would try to stay under 185psi, but 180 would be better for good pump gas around 92 octane. Actually compression ratio is a much better measure for what kind of fuel to run since static compression is just a function of atmospheric pressure.

[NELSON]

http://webpages.charter.net/beckracing/page56.htm check this out. do you know how many ccs you head is?

[flotek]

there are 3 main factors (actually even more)when it comes to detonation ... ignition timing ,static compression , exhaust port design

[Sticker Otis]

Originally Posted by flotek

there are 3 main factors (actually even more)when it comes to detonation ... ignition timing ,static compression , exhaust port design

Geee, thanks. Yuk, yuk. Wuz just filing down the head with this big old rasp and wuz wonderin when ta stop. Now I feel enlightened to my lack of understandin when it comes to the sophisticated complications of a modern 2 stroke machine I'm humbled.