Nitrous ring gap?
On The Tree
Joined: Oct 2011
Posts: 179
Likes: 3
From: Eastern Kentucky
I've built several NOX engines and I've always used .024, .026, .015 and have not had any problems. These guys seem to be running a bit looser than that. Heck, I've built some small block Poker Run Marine engines and use the .030 gap. That seems way big for a NOX engine. The Poker Run boats run 5500-6000 rpm for quite a while.
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First, WTF is a "NOX" engine.
Second, it would seem you're inferring the ring gap on a NITROUS engine should be smaller than N/A?
.030 is fine for a big shot. It was right in line with my builder AND piston manufacturers recommendation.
Second, it would seem you're inferring the ring gap on a NITROUS engine should be smaller than N/A?
.030 is fine for a big shot. It was right in line with my builder AND piston manufacturers recommendation.
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On The Tree
Joined: Oct 2011
Posts: 179
Likes: 3
From: Eastern Kentucky
First, WTF is a "NOX" engine.
maybe he meant NOS?
Also, I didn't intend to talk about your builder. There are many of us out there and not all do things exactly the same way. I use a lot of Mahle and Diamond pistons and they specify .055 for Mahle and .070 (Diamond) per inch of bore for a NOS equipped engine. That works out to about .022 top ring gap (Mahle) or about .028 for the Diamond which I think is too much. I open up the Mahle and close down the Diamond. We're all different.
I typically open the second ring up a couple of thousandths more than the top ring. Any combustion pressure that gets through the top ring gap shouldn't pressurize the piston area between the top two rings. That will create a pressurized area and could lead to a flutter of the top ring and decrease it's sealing properties. My making the #2 ring gap a little bigger it allows this pressure to escape instead of build.
Sorry if I offended you or your builder. It certainly wasn't my intent. As I said, we all do things a little differently. Not right or wrong.....just different. I plateau hone every engine and don't suffer as much initial wear and probably have less initial oil contamination than people that just do quickie 220 grit hone. Again....not necessarily wrong, just different. If the rings don't wear initially then the gap should be closer to what is necessary after a bunch of miles. But that's just me.
On The Tree
Joined: Oct 2011
Posts: 179
Likes: 3
From: Eastern Kentucky
I was thinking you were using a different nomenclature for Nitrous OXcide...lol and just left it at that.
Just sitting here waiting to eat humble pie.
Thanks guys. It looks as if everyone is running totally different set ups. I should have specified for a 383. My builder has gaps in mind i just wanted to see what other 383's were running.
There are far too many variables you have not specified to give an accurate reply.
What are the pistons/rings/bore/stroke/cr/etc???
Just check with the ring and piston manufacturers of what you have and see what they say for your application.
What are the pistons/rings/bore/stroke/cr/etc???
Just check with the ring and piston manufacturers of what you have and see what they say for your application.
