whats the max compresion i can go one my 347 and run on premium unleaded? any imput would be great appreciated.
Engine Compresion Ratio?
- Thread starter marks89
- Start date
twistedwankel
Member
I ran 10:1 on pump 93 octane unleaded with never an issue with a carbed very basic engine using no computer at all.
BUT your spark advance and computer controls will have alot to do with what you can do like a simple "knock sensor"? Modern computers allow up to 12:1+ with the right sensors. You building a diesel?
BUT your spark advance and computer controls will have alot to do with what you can do like a simple "knock sensor"? Modern computers allow up to 12:1+ with the right sensors. You building a diesel?
Depends on the octane. My buddy was getting away with 10.5:1 on 91-octane a while back...but he had to back the timing down quite a bit to do so.
Jace78
Member
im actually gonna have to drop compression on it. its in my race car right now am gonna change heads and cam so i can run fuel injection and nitrous. it has 7cc domes. droping compression with thicker head gasket. will be aluminium heads. want to push as much compression as possible. thanks for the imput. mark
Well that just blowsN20 loves compression.... what's the combo and specs? Thicker headgaskets can be an issue with increased quench.
D- they pulled all the e85....
i will be changing cams, ill call comp for custom grind. heads are set of ported svos and a trickflow track heat thats supposed to be ported. my 347 is a dartblock with eagle rotating assembly, i think throttle body and mafs is 75 also. 42 over injectors and 140gph fuel pump. bought street car and love it so much want to put my 347 in it and maybe sell race car or build bigger motor for race car.
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