searched but couldnt find the correct info i am looking for.


have a motor im building for a customer.

ring gap suggests:

top ring: 0.0067
2nd ring: 0.0061

which multiplied by 3.189 =
top: .021
2nd: .019






when i gaped the rings straight out the box the top ring was already at .022.

didnt even bother gaping the 2nd ring. is this typical of arias to have their **** pre gaped straight out the box?? need to know so i can send em back or install them.



shooting for 480/500ish hp btw.

 

I setup my 84.5mm motor with a .021/.019 gap, similar power level on 93 and never had an issue.

 

but if they are already at that gap without having to file them, what would you do?

 

i would drop them and run them

 

ill probably just do that. im going to measure the 2nd ones tomorrow and if they are within spec ill run em. but im just scared something may be a problem later on.

 

I ran into this once with JE pistons and rings. I asked them about it, and they said sometimes the production runs can vary. I asked about ordering another set of rings, and he said it could be the same run with same results. If I remember correctly it was something like .024" and .022". I just made the rings match. but that was the minimum I could achieve. No problems running those gaps though.

 

2nd ring gap is supposed to be bigger than the top ring to prevent gas build up which causes ring flutter.

 

I run .022 on top and second ring with my arias pistons. No issues.

 

so what do you suggest with the information you've been presented with?

 

Sounds like your cylinder bore is too big.

Are you seeing the same across the board? IE: All cylinders the same?

 

ive been having this issue a lot over the past few years in my dealings with all motor setups. there is always a ring who's gap is too big right out of the box.

for you, there is nothing wrong with .022 on the top ring. even the rest of the rings to match the gap of that one. for the second ring go a bit bigger, maybe .024/.025. it wont smoke or blow oil with those gaps.

my 84.5mm gsr is at .023/.026 and it doesnt consume any oil even with ptw way up around .005+.

you are good if you ask me, carry on lol

 

What I would target would be
3.189 x .0060 = .019" top
3.189 x .0065 = .020" ~.021" second

All of the ring packs I've used from CP or Wiseco had the second ring gapped large out of the box. But you are saying the top ring is gapped big too. I think Tepid is right. I suspect your bore might be bigger than you think. Measure the bore and measure the unfiled second rings.

 

I've only measured 1 single ring out of the entire 8 not including oil rings or rails. Will do when I get a chance.

 

my setup, 81mm wisecos, .0019 top, .0023 bottom, a little over .004 PTW clearance. Shooting for the same power level, and possibly more.