whats the highest comp i can run with mixing av and 93 50-50
 

bbc, 572, currently at 9.7-1 comp on pump gas, aluminum heads, marine application.

Looking to make more power by raising the comp , but dont want to buy race fuel. Av gas 100-low lead, is readily available and i heard it makes a really good fuel when mixed 50-50 with 93 octane. What is highest comp ratio i could run with this mix?

I would'nt go over 12 to 1.
I ran a 12.5 to one comp in my old racecar using a half and half mixture of racefuel (110 sunoco) and 93 pump gas, ran it that way for 4 years no trouble.
Goodluck, Charles

AV gas is poo!

It was created for fixed rpm at altitude. I have seen lots of motors damaged by trying to run AV fuel.

IMHO

I have seen quite the opposite.

I ran it for years in my 69 chevelle, 12.5:1 as well as know many guys that did and still do run av gas.

I would never suggest it to anyone I built motor for or race with.
I would stick to a brand name racing fuel company.

IHMO

I know several people who run av gas in high compression motors with no problems, but they use top lube with it as its kinda dry if you know what I mean. However I wouldn't recomend using it as a mixer with unleaded fuel in anything higher than 11 to 1.
Goodluck, Charles

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Down here in redneck country, we run avgas with some motors up to 12 to 1 and some street blower motors. we just throw in a can of marvel mystery oil per 20 gals of gal. No issues and cheaper than top oil lube. we also wipe/spray down the headers with marvel mystery oil with a mix of oil paint thinner 75% thinner and 25% marvel oil. The headers still look brand new after 2 full seasons on a sprinter, black and shiney, and they never rust.

Zip.