cool head domes

[bansheeboyjp5]

i just rebuilt my banshee its bored 30 over and i put a cool head on it with 20cc domes i was wondering if id be ok to run pump gas with the 20cc domes cause i had a guy tell me i couldnt

[Cali]

i just rebuilt my banshee its bored 30 over and i put a cool head on it with 20cc domes i was wondering if id be ok to run pump gas with the 20cc domes cause i had a guy tell me i couldnt

 

You should beable to run pump gas on 20 domes,but check your compression first.I just did a rebild with 40 over with cool head & 20 doms.I have 180 PSI compression.So im going to run 50/50 race fuel & pump gas.I hear anything over 160 you have to.

[dajogejr]

Compression ratio, NOT cranking compression dictate the need for octane.

 

http://www.csgnetwork.com/compcalc.html

[bansheeboyjp5]

so what does that mean? how would i check the ratio and what numbers would determine if i can run 93 pump or race fuel?

[overrevtricky]

Compression ratio, NOT cranking compression dictate the need for octane.

 

http://www.csgnetwork.com/compcalc.html

 

That link just made my day!! thank you much kind sir!

 

I'm in the same boat you are bansheeboyjp5. Put a modquad head on with 18cc domes. Compression tested at 160, so I am going with Avgas 100LL, as I can get away with it at that compression. It's a great alternative to 110 race gas.

Edited April 15, 2010 by overrevtricky