Compression gains

[banshee_R1]

My motor is completely fresh and running 135psi. What kind of increase have you seen after breakin in the motor?

[dirtydownunder]

depending on set ring gaps, but you can see from 10-20psi difference.

[banshee_R1]

.006 ring gap. I was thinkin 5 maybe 10. Better hold off on droppin my dome size

[Coupelx]

.006 ring gap. I was thinkin 5 maybe 10. Better hold off on droppin my dome size

 

dont be disappointed if it doesnt change much though. the last few engines ive done havent had a drastic change.

[Pasi S.]

I don´t know much about what you are asking, but have you measured your squish with your new topend?

I did my topend and it was 115 and 110psi before, and after a new topend it was 135 in both cyls. I was expecting something closer to 155 to 160 because my did the head milling at the same time.

The problem was a little too thick base gasket and my squish was 1.65mm!

 

-Pasi S.

[mopar1rules]

I don´t know much about what you are asking, but have you measured your squish with your new topend?

I did my topend and it was 115 and 110psi before, and after a new topend it was 135 in both cyls. I was expecting something closer to 155 to 160 because my did the head milling at the same time.

The problem was a little too thick base gasket and my squish was 1.65mm!

 

-Pasi S.

 

which base gaskets did you use?

[Pasi S.]

I don´t remember the brand, but def not a Cometic. They came with the top end-kit. the base gasket was 1mm thick.

Now I have 0.5mm Cometic steel gaskets.

 

-Pasi S.

[mopar1rules]

1mm (.040") thick sounds like moose racing base gaskets.

[lms1977]

.006 ring gap. I was thinkin 5 maybe 10. Better hold off on droppin my dome size

 

.006 seems real tight if you already ran it you should be fine I think it is suppose to be closer to .01 or .012