Scampin around
Well-Known Member
would 10.5 to 1 compression be too high o super charge? Would you need to build bottom or would it be strong enough stock?
PumpDepends, what fuel???????????
Kindly eat ****. Kindly.
That's a terrible rule of thumb, and there are tons of 10:1 engines running around on 93-94 pump gas w/o any issues. There is no "rule of thumb" because the amount ofThe rule of thumb for naturally aspirated stockish cam compression I've always heard is move the decimal point to the right for the octane.
9:1=91 octane
10:1=100 octane
Heard this would allow max spark advance in most motors.
Dunno how correct, but that's what I heard.
Most blower motors run lower compression, not higher.
That's a terrible rule of thumb, and there are tons of 10:1 engines running around on 93-94 pump gas w/o any issues. There is no "rule of thumb" because the amount of
variables that affect suitability are nearly endless. From head and block materials,design,cooling system quality & effectiveness, spark plug location & cooling, quench vs.
no quench vs squish vs the terrible zone in between, piston design, intake system fuel distribution variation,....................it doesn't end there but You get the idea.
LOL! Oye!. OK, I'll take a sec. to shake those memories off,...........ahh, all better!Agreed there's room for improvement on all the fronts you mention, but I would say that rule of thumb is, as I heard it, the starting point.
That said, the Quad 4 was still in production when I heard that....
That's a terrible rule of thumb, and there are tons of 10:1 engines running around on 93-94 pump gas w/o any issues.
The rule of thumb for naturally aspirated stockish cam compression I've always heard is move the decimal point to the right for the octane.
9:1=91 octane
10:1=100 octane
Heard this would allow max spark advance in most motors.
Dunno how correct, but that's what I heard.
Most blower motors run lower compression, not higher.