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[Fot] more on piston scuffing...

To: rkramer3@austin.rr.com, edwardbarnard@prodigy.net
Subject: [Fot] more on piston scuffing...
From: fubog1 <fubog1@aol.com>
Date: Wed, 12 Sep 2012 13:50:05 -0400 (EDT)
Cc: fot@autox.team.net
Delivered-to: fot-archive@autox.team.net
Delivered-to: fot@autox.team.net
References: <1347459862.80483.YahooMailClassic@web181402.mail.ne1.yahoo.com> <88538F2A-6D3E-4513-A3CD-3DB95F743998@austin.rr.com>
 Just a few other things to check.
Look at the underside of the piston for color, I like to see just a little
tan, that shows that it's getting good heat in the chamber. If is dark
brown/black, it has been too hot. That can cause the piston to run too hot and
it can scuff as a result.
Also look for a pattern, if it's scored/scuffed all the way to the top of the
pistons, it could be a ring issue, check for heavy wear in the top ring groove
(usually rich running). Or heavy burnishing/scuffing at the bottom part of the
thrust faces, likely ran out of clearance.
These long-stroke engines have a pretty high piston speed so at high revs they
are right on the edge of the limits...

 Glen
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