Wiseco GFX ring gaps help
Wiseco GFX ring gaps help Finally have my new engine back from the machine shop and its time to assemble but first I need to gap the rings for boost. According to the paperwork that came with the pistons, the gap should be .006 x bore (4.03) for the top ring and .0065 x bore 4.03.
top .024
bottom .026
would this be adequate for a s480 6 liter engine? I ask because I've been reading and seeing people go .028 and .030/.032. Which way would be the correct way. My machine guy said .028 for the top ring and leave the bottom ring alone....I just want to triple check.
top .024
bottom .026
would this be adequate for a s480 6 liter engine? I ask because I've been reading and seeing people go .028 and .030/.032. Which way would be the correct way. My machine guy said .028 for the top ring and leave the bottom ring alone....I just want to triple check.
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Joined: Jan 2012
Posts: 557
Likes: 9
From: Bowling Green KY
The engine building books would agree with the 0.026/0.028 for a mild build but more like the 0.28/0.30 for a more aggressive level like 12psi or more boost. The lower ring should always be gapped larger than the top ring so pressure doesn't build between the two rings and cause flutter. That's what the books say but I know people are having success outside of these recommendations, and exact ring alloy from manufacturer varies a little which is a factor.
Thanks and that is whats getting me. I plan on pushing for 25psi max maybe and I just don't want to "under" gap my rings. Im sure someone has experience with these Wiseco GFX rings because the specs they want make me "think" they're not gapped enough.
I accidentally opened 1 of my gaps up to 0.032 top and 0.038 on 2nd ring...I was shooting for 0.028 and 0.030 respectively. I decided to order a new top and new bottom ring for that cylinder just to be safe. Would you guys ran it and said F it?
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Verdad Gallardo TECH Enthusiast
Joined: Jan 2012
Posts: 557
Likes: 9
From: Bowling Green KY
You did the right thing getting the new rings though. I'm sure stevieturbo is right, but the problem is that if your the type of guy that's debating over 0.026/0.028 vs 0.028/0.030 it would give you fits forever knowing one cylinder was 0.032/0.038. You would wake in the night 6 months from now, cursing yourself for not doing it. I know I would, knowing it is less than perfect, I'd be forever second guessing my decision to run it. Every time I seen a little extra oil in the catch can, I'd be wondering "if I'd have gaped those rings right would I have this much?". Piece of mind is worth the price of the rings to me, and I'm betting you as well.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
You'll never ever hurt an engine with ring gaps that are too large...and those are not too large.
In percentage terms as far as ring contact area goes it is almost negligible. I'll always leave my gaps a little larger that what some claim are "correct" even though there is no generic correct number.
In percentage terms as far as ring contact area goes it is almost negligible. I'll always leave my gaps a little larger that what some claim are "correct" even though there is no generic correct number.
You'll never ever hurt an engine with ring gaps that are too large...and those are not too large.
In percentage terms as far as ring contact area goes it is almost negligible. I'll always leave my gaps a little larger that what some claim are "correct" even though there is no generic correct number.
In percentage terms as far as ring contact area goes it is almost negligible. I'll always leave my gaps a little larger that what some claim are "correct" even though there is no generic correct number.
Last edited by 87caprice318; Nov 25, 2016 at 09:58 AM.
Thanks for the feedback. I think it would never have been noticeable like stevie said...but after all the time and money, for another $38 for 2 replacement rings and considering I am not in a rush to put it together, I figured why not.