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engineguyBill wrote: 'These dimensions are assuming that you will be using good quality piston rings, Steel or Ductile Iron top ring and Grey Iron second rings. There are steel second rings available but they are not necessary due to the fact that the second ring does not directly operate in combustion heat nor direct compression pressure. The second ring's primary function is oil control.Sun Feb 17, 10:36 pm
Quick and easy answer:
Top ring ." per inch of bore diameter ." X 4.060" bore = .018" gap
2nd ring ." per inch of bore diameter ." x 4.060" bore = .022" gapQuick and easy answer:Top ring ." per inch of bore diameter ." X 4.060" bore = .018" gap2nd ring ." per inch of bore diameter ." x 4.060" bore = .022" gap
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These dimensions are assuming that you will be using good quality piston rings, Steel or Ductile Iron top ring and Grey Iron second rings. There are steel second rings available but they are not necessary due to the fact that the second ring does not directly operate in combustion heat nor direct compression pressure. The second ring's primary function is oil control.
bergs. Piston rings come as the familiar compression rings and oil control rings. The compression rings have variations and can come with different profiles depending on application.
The A10 ring grooves are imperial measurement, first and second grooves are the same, 1/16", the oil ring groove is wider. If the profile of the ring is not symmetrical, it will be marked "Top". Typically tapered profile or "ridge dodger" type where the top ring is designed to avoid the wear ridge at the top of the bore. The second ring sometimes comes with a " Napier Scraper" profile. The scraper looks like a hook in profile, and this is fitted on the underside. What's in the pack depends on the ring set you chose.
With no markings you can assume the profile is symmetrical and they can be fitted either way up. The ring should look the same from top or bottom. Measuring the ring for correct bore fitment is awkward to do, just putting it squarely in the bore and measuring the gap is a reasonable way to estimate if they will do. Oil rings are solid cast iron or spring loaded scraper rail type, again, depends on the set.
Unmarked, no box means they have to be cheap and the supplier needs to have a proven good customer service record.
Back in the day Hepolite set ref (A10 70mm bore) originally contained two identical plain compression rings. These can be fitted either way up, but being plain (in other words a symmetrical profile), are only suitable for a newly bored cylinder or a used cylinder where the wear ridge at the top has been removed....otherwise the new top ring will hit the ridge. Later sets may differ in ring profile, I don't have my catalogue to hand to check.
Hepolite (the old original AE Company) suggest a ring gap of 3 thou per inch of bore diameter. This applies to the compression rings and the cast iron oil control ring. This ring can be fitted either way up.
Swarfy
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