Quote:
Originally Posted by enkeivette
Ive been through 4 HG replacements, probably 10 intake manifold replacements, and 2 sets of piston rings. What could possibly account for a uniform loss of compression in all cylinders, that does not cause oil consumption, loss of mpg, or at least a significant loss of power, while persisting through all of those changes?
Quench alone shouldn't change a compression reading. 9:1 with a 110 should produce the same measurement no matter how that air is swirling around in there.
Guy, yes, compression test was the same before and after break in.
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Ring gap, pushrod length, rockers, lifters, basically anything valve train related could cause uniform compression issues if something was not installed right or a wrong part was used. Not uncommon for people to think they have compression loss only to find out they have way too much preload on the valve train.
I don't have any one thing I can say it would be, however I do know that 9:1 should make a minimum of 130psi with a 110 lobe center. Are you positive you calculated the compression properly? What df the heads CC out to?