I took my block to a shop recommended to me by a few other shops in the area. I had the guy bore and hone as well as file down the rings.

I picked up the block today, and here are the ring gaps that he wrote down:

#1
Top 014
2nd 019

#2
Top 014
2nd 016

#3
Top 014
2nd 019

#4
Top 014
2nd 018

That's exactly what he wrote-- I'm sure the measurements are in thousands of an inch, though. I believe he said the oil rings were already gapped sufficiently, and the 2nd rings had enough gap in them as well, so he didn't have to fool with them much.

These specs seems pretty tight.. but that may be a good thing.. I want this engine to not burn oil and stay running for a long time.

It's going to be a Turbo engine. Wiseco 8.8:1 Pistons, Eagle rods, ARP headstuds, etc. The turbo is a Holset HX35. Will be putting down over 300WHP daily.

What do you guys think? Is this too tight, or will it be alright?

I just want opinions from those engine builders out there who have experience in this area. Thanks!

 

It's tighter than I would run.I like to go with .006" / inch on turbo engines (.006x 3.199= .019") on the top and second ring.You at about .004"/inch which is OK for an all motor street engine.
Glenn

 

This is going to be a Turbo daily driver. Any more input?

 

Bump.

 

i'm dumb, i was thinking about something else


Modified by Davep at 10:12 PM 3/9/2006

 

This might help you rest easier

http://www.theoldone.com/artic...s.htm

 

I gave the guy the full specs sheet that came with the pistons. I believe the specs were in metric, but when I converted them, I got around .0016 for the Top ring, and .0019 for the second ring. Is .0002in going to make or break this setup? If they absolutely need to be gapped looser, I'll call the guy and tell him that the specs sheet said .0016, and .0019 respectively and he didn't go by it, when I told him to, so I want them gapped to what they are supposed to be.

Also, piston to wall clearance should be .0025 as stated in Wiseco specs (he did specifically ask if I had those specs, and I showed him).

 

I searched for you... here is wiseco's ring gap spec page http://www.wiseco.com/PDFs/Cat...s.pdf

Street Moderate Turbo top ring 0.005 gap/inch 2nd ring 0.0055 gap/inch Oil ring minimum 0.015 inch...

If you want to deviate, earl will be your definitive and final answer man...

 

I put mine at .0019 top and .0021 second ring. 81mm GSR motor shooting for ~600whp

 

Direct from earl:

"I read the entire thread and all the advice you got was good. With your horsepower goal, .014" would be ok on the upper. If you were shooting for 500, you might want to open the uppers about another .003" or so. The rest of the gaps are fine as is...so I think you are good to go."