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abit off center
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Piston ring end gap? J&E's
J&E gives a table for a guideline only, I need more than a guideline! They use Bore which is 3.858 (98mm)X.0045 which is around 19 thou, end gap, second ring is a little more and the oil ring is min of .015 What are these really to be at? 98 J&E 10.5 to 1 in new nickasil cylinders.
Thanks
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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02-15-2006, 09:58 AM
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abit off center
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Forgot to say they are Goetze rings if it matters
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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02-15-2006, 12:22 PM
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abit off center
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Just checked the stock rings (all cylinders) and they all come out right at .018 first and second which are the same ring, the oil ring is at .016
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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02-15-2006, 05:17 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Craig,
Use stock end gaps for the 3 rings. c1=0.2-0.4, c2=0.2-0.4 and oil=0.3-0.6 millimeters. |
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02-15-2006, 06:42 PM
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Registered
Join Date: May 2003
Posts: 3,346
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The problem is finding rings that get to stock tolerance. I have brand new Goetz rings and they are .022 inches. My old rings with many miles (don't know exactly) measure at .026 inches. Kind of silly to put new rings in if this is as good as I can get.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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02-15-2006, 10:55 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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The factory limits are 0.8 (0.0315"), 1.0 (0.0394") and 2.0 (0.0787") millimeters. I know you know that Andy (and Craig too I suspect), but the tolerance limit permits quite a large gap.
Last edited by MotoSook; 02-15-2006 at 11:09 PM.. |
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02-15-2006, 11:03 PM
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1969 and 1986 Porsche Targa and Coupe 1720cc and 3
