555 bbc
 

i got my 555 with 13to1 pistons ready i am running c16 at the track just wondering if i can run 93 octane with booster on the street if i back the timing off thanks

Re: 555 bbc
 

I'd say no

Re: 555 bbc
 

a 13 to 1 piston doesn't mean you have 13 to 1 compression. Do you know deck height, head gasket, bore, stroke, head cc, dome cc, and so forth. If I was gonna drive it on the street I would run Av gas with 1 ounce of marvel mystery oil per gallon.

Re: 555 bbc
 

pardon my ignorance, but what is the marvel mystery oil going to do?

Re: 555 bbc
 

i dont know i am thinking that av fuel bruns dry and the oil will gave you some lube

Re: 555 bbc
 

Its a Mystery LOL

Sorry couldnt resist...

Re: 555 bbc
 

Exactly!

Re: 555 bbc
 

Octane Booster is no good. with 13:1 back off the timming and see. it will idle and at light loads you MIGHT be OK but you're just looking for trouble. You could try water/meth injection or run good gas all the time.

Re: 555 bbc
 

No na NO NO NO

If you don't know true pressure it's a Big Gamble.

9:1 {pressure} is about it without some other factor IE: water

Re: 555 bbc
 

A buddy of mine had a 13 to 1 440 in 70 duster back in the day and he ran av gas.

Re: 555 bbc
 

Theres 91 and 100 octane avgas. Don't use the wrong one.

Re: 555 bbc
 

i just pick up some 100 octane av i back the timing seems to run good just hve to play with jetting again

Re: 555 bbc
 

Carb and size, fuel injection, computer, HEI, Aluminum heads or cast iron, etc. There are some details you left out. If you want a response based on a guess, I would say you can, but you will have to back the timing off so much it would run like crap.

Re: 555 bbc
 

do you have e85 where you live, be right at home in that motor.