Ok, heres the math; c/r= (CV+cv)/cv. Where; c/r is compression ratio,C/V is swept volume of one cylinder, and c/v is total chamber volume.
C/V=(360/eight)x2.54cubed = 737cc
c/v=0(for deck)+5cc piston+8cc gasket+63 head =76
So.....c/r = (737+76)/76 = 10.7
With those numbers your approximate compression ratio is 10.7:1.
My engine runs the same numbers and she generates 165psi, easy.
However,when I do a compression test, I dont stop at the 4th revolution.Some lazy(dry, or long not run) engines require 6 to 10 revolutions to peak. Also I block the Throttle blades full open to speed things up.After the baseline test I squirt a bit of oil in each hole and crank it over maybe 10 or 15 seconds to distribute and disperse the excess oil.(sometimes makes a mess). Then I repeat the test.I also watch the compression build after each shot.Im looking to see each cylinder building at a similar rate.
Whoa, I musta fallen asleep at the keyboard.We are on page 3 already.
I have 125000 miles on my Eddies.
