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Old Mar 3, 2008 | 07:44 PM
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Default Ring gap question

I'm building a forged motor and bought a set of Total Seal nitrous steel top ring rings for it. I plan on spraying around 150-300 but only plan on doing so every once in a while. It will mainly be a H/C car probably around 60% of the time. So my question is the rings are file to fit and it says for nitrous over 150 you need to gap them at .031" This seems like a pretty big gap to me. I realize that 150+ is quite a bit of nitrous and it needs looser clearances but will this hurt the compression when I'm just running H/C and not spraying? The clearance for less than 150 is .023". Which should I gap it at? I don't mind gapping it at the bigger clearance but I won't be spraying all that often.

It has clearances for the top ring, second ring and oil rings. There is also a specification for both less than and more than 150 shot. I guess what I'm asking is which I should use and will it hurt compression to run the larger gaps?

Thanks
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Old Mar 3, 2008 | 08:47 PM
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what size is your bore,genarally for a n20 engine i run .0065 per inch of bore diameter on the top and .0060 on the second
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Old Mar 3, 2008 | 09:05 PM
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Bore is 3.905" Going by your figure that would make the top ring gap .025" which makes me a lot more comfortable. The manufacturer specifies .021 for the second ring if spraying more than 150 and .018 if spraying less... which numbers should I go with?
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Old Mar 4, 2008 | 12:02 AM
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Go with the specs you were given, that sounds about right.
I had .024 top and .021 bottom for my blown application, usually the N2O is about the same. But be sure to go with what the ring manufacturer specifys.
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Old Mar 4, 2008 | 12:13 AM
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I did the upto 150 giving a .023/.018 gaps but I might do a 200 since I do have a forged bottom end
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Old Mar 4, 2008 | 03:24 PM
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I called TSP today and got it cleared up. I'm going to gap the top ring at .021 and the second ring at .023

Thanks guys
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