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Join Date: Oct 2004
Location: Victorville, CA
Posts: 140
Ring End Gap 2.7 Race Engine

I'm in process of building up a high compression (11:1 calculated) mechanically injected 2.7L for some club racing. Engine machine work is done and I have brand new J&E pistons (89.992mm/3.534") made for the cylinder bores (90.017mm/3.544"). Cylinder wall clearance is good @ .035mm/.001". Problem is with the new Goetze rings I got with with the rebuild kit from EBS (not their fault). When measured near the bottom of the cylinder bore (as recommended), the ring end gaps ranged as follows:
Top Ring: from .016" to .019"
Mid Ring: from .013" to .018"
Oil Ring: from .017" to .023"

So the problem is that initial ring gap for most will be larger than recommended spec but well under the wear limit. Can I set each ring (top, middle, oil) to match the largest of the group and be ok?

Thanks for your comments.

Gerry

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Gerry
930 slantnose (previous)
996 Carrera 4 (current)
1979 Trans Am (fully restored/current)
1977s track car project (current)
Old 08-04-2012, 07:10 PM
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Join Date: May 2008
Posts: 726
Not sure of the question but it seems to be typical that the ring gap is bigger than what new should be. Here are a few posts of mine on a similar issue.
Piston rings, wrist pin & rod bush

New Mahle pistons/cylinders 2.7
Old 08-05-2012, 10:13 PM
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Join Date: Oct 2004
Location: Victorville, CA
Posts: 140
Ring End Gap

Thanks for the links. This seems to be a common occurance.

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Gerry
930 slantnose (previous)
996 Carrera 4 (current)
1979 Trans Am (fully restored/current)
1977s track car project (current)
Old 08-06-2012, 10:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
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