12:1 compression ratio
 

just finished rebuilding the first of two 502 engines for the cafe racer. Since there are no dynos in panama and all i have to go by is the compression ratio, was wondering what kind of hp would the engine put out considering 12:1 compression? no blowers, just naturally aspired.

Need a lot more info than that; Heads, cam, carbs? also @ 12:1 can you say "The Pin Has Been pulled." That is A LOT of compression in a boat engine. You running straight race fuel?

Hope there is lots of GOOD gas in panama !!!!!!!!!!!!!

!!!!BOOM!!!!! :lolhit: I say way too high!

problems
 

big compression like that you are asking for trouble.looks like you will be burning the realll expensive stuff.i can only imange how much race gas cost in panama.

gas in panama is 91 and 95 octane at the marina.

then it doesn't matter how much it costs because you are only going to use about 3 gallons before the pistons melt.

if you are locked into 91 /95 then you better get it down to 9.5 or so or start buying pistons in bulk.

Yup................. Im at 9.8 and on the teeter of oh $hit.
-Mike

started the engine for the first time , runs nice, but on JET FUEL... guys were right. as usual. will jet fuel cut the cheese?

octane
 

i would think you would need aleast 110-115 octane to support that kind of compression,maybe more.