| Piston Ring End Gap [message #224924] |
Tue, 08 October 2013 23:21  |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma:
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Senior Member |
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Hello Engine builders:
The Quick Questions are:
(Mahle Cast Rings)
A What are you experienced Builders Using for an end gap when installing your rings?? any problems in the .010 to .015 Range
B With our engines running harder and sometimes hotter, are you running larger gaps?? Most Ring Companies seem to be indicating .0145 as being minimum for a 4.156 bore such as mine. (.030 over) (4.156 X 0.0035 = 0.0145)
My engine destroyed a crank.  I have a pocket full of theories as to why the engine failed, but none could be substantiated. Unfortunately not knowing the exact cause is frustrating.
I found a core crank,and had it ground .010 under on the mains and throws. I also had the rotating assembly balanced. Luckily the cylinders were not damaged and a light hone made them good as new. (I'm happy I did not have to replace my nice forged pistons  )
Now that I finally have all the parts on hand, I can start building the engine again. Currently, I’m measuring about .012 to .014 ring end gaps. While these measurements are fine according to service manual specifications, they may be a little tight according to general knowledge.
Best Regards
John Heslinga
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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