Quote:
Originally Posted by 4sd911
Not hijack this tread but I may have a problem similar to this.
If we are keeping the head, the cylinder height and the case all within 0.0005", if all measurements cascade in the same direction can the torqued heads have a difference of 0.0015" and be OK?
My car after about 20,000 miles on the rebuild has started show a little oil leak at the head to cylinder. I plan on pulling the engine and removing the right bank to see whats going on.
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If you were lucky enough to hold a 1.5 thousands on an entire stack you win. Those kinds of results only exist by shear luck. Of course 1.5 thousands between stack is acceptable
You target unrealistic numbers to reduce the cascade. I think you'll find deviations in the 2-2.5 thousands acceptable. Remember, when you torque down your head studs everything changes.
A word of caution: As cool as precision feels good, you can waste a tremendous amount of time, money and serenity searching for perfection.
Just for fun a few months ago I went searching for .1 gram balance on a set of steel 911 rods. Porsche calls out 4.0 gram but our normal goal is .5 gram but I was feeling froggy.
2 or 3 hours later I tapped out.