Tue, June 7th, 2022, 08:19 PM
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F Your Yankee Blue Jeans
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Join Date: Jan 2009
Location: Somewhere in Montana
Posts: 3,063
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Quote:
Originally Posted by Power Hungry
What did you end up running for Ring End Gap? Normally on a 4.360" bore with factory pistons and rings, I'd use about .025" - 0.028" for compression rings (maybe 0.028" - 0.030" on the 2nd ring) and .018" - 0.020" for oil ring.
For aftermarket stuff I just use whatever they recommend, especially for hypereutectic pistons. The expansion rate on those are slightly different then regular aluminum slugs.
*Technically", some specs only call for 0.004" per bore inch, so in those cases a 0.017" end gap would be considered acceptable. At the end of the day, I'd rather be a tad larger gap than too small. As someone mentioned:
If the gap is too big, only you will know. If the gap is too large, EVERYONE will know!
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I'll be running .029" due to the 4.442" bore and the formula of .0065"/in. on run of the mill "rebuilder" cast pistons.
Better safe than sorry.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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