.030 1st .032 2nd

 

Not trying to be an ass. But there are tons of threads on this subject. One of them had a formula for ring gap. Engine builder will also have his/her opinion.

 

Seems like I spend all my time in books and forums and the knowledge gained is truly appreciated. Speed Pro's recommendation seemed to change above "nitrous street" . Prost63vette I appreciate your time.

 

talk to total seal and they will also give you some good info.they were the 1st people to tell me ring flutter is a so rare and they will also tell you more ring gap on the 2nd ring,not the top.

 

Thanks. I had read in a few places of running more on second ring. Just didn't know if at some point you get diminished returns. Probably should have called them but I new there's a ton of real world experience on here. Thanks again.

 

If you make them both .030....... the second will be bigger under running conditions....

 

^^^^^exactly

 

Thermal expansion of top ring

 

The second ring will open up .010” at the gap after the tapered face seats in even .003” for this reason, I don’t get carried away on second ring gap.

.035” top
.025” second.

After they seat in, the top will be tighter than the second, as mentioned.

Don’t forget to open up the gap on the top oil ring rail to the same as the second ring. You need to complete that path of pressure evacuation to the oil ring groove returns.

 

So are you telling the OP to go .035 top and .025 second ?

 

Really, the simple answer is; the second ring doesn’t need to be opened up because of nitrous and a larger top ring gap. The top ring closes more from the heat and the second/top differential is still correct, second ring opening up on it's own aside from the fact.

 

I use this chart.

 

Interesting .

my new ring set has a steel top , and this time no ductile second .

Last set went in at .026 top , .028 second .

With almost 35psi of boost , I think Ill go .030 on both , if not bigger

 

Thanks for the info guys.