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Views: 2,816  ·  Replies: 3 
> Ring gap, too much or too little?
s12drifter
  Posted: May 24 2012, 01:23 PM


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I've asked a few techs about ring gap and they couldnt give me a straight answer. I wont trust google or wiki on instructions on how to gap a ring.

you want blow by but not too much, I'm building a VG30DET capable of 700hp if i want but i could also make 250hp.

how do i know what kind of gap i need for a 500 - 700hp motor?

just as an example lets say my ring gap for my VG30DET is around 0.15mm from the factory, how much more do i need to open it up for 500 - 700hp?

This post has been edited by s12drifter on May 24 2012, 01:55 PM
Nomake Wan
Posted: May 24 2012, 04:16 PM


ShiMACHaze
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You're asking IDW? And I find it hard to believe your power claims and build claims when you're asking these sorts of questions all the time. I would think someone who knows what they're doing when building engines would already know.

Then again, looking at your track record for builds thusfar...
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Spaz
Posted: May 24 2012, 07:24 PM


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Wiseco's recommendation for a street-strip motor is .005” X bore diameter for the top ring and .0055” X bore diameter for the second ring. Oil control is minimum .015". I looked up an SRP sheet as well, their numbers are the same.

For higher boost levels I'd run an extended break-in period at those numbers, like 1500 miles or so without boost and a ton of vacuum pulls. You could run a higher gap and do a shorter break-in, or tighter and longer, but you probably won't notice a big difference in blowby or cylinder pressure once you throw a ton of boost at it anyway, they just need to be tight enough to get a decent seal to retain compression.
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Wanderer
Posted: May 25 2012, 03:35 AM


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QUOTE (Spaz @ 8 hours, 10 minutes ago)
Wiseco's recommendation for a street-strip motor is .005” X bore diameter for the top ring and .0055” X bore diameter for the second ring. Oil control is minimum .015". I looked up an SRP sheet as well, their numbers are the same.

For higher boost levels I'd run an extended break-in period at those numbers, like 1500 miles or so without boost and a ton of vacuum pulls. You could run a higher gap and do a shorter break-in, or tighter and longer, but you probably won't notice a big difference in blowby or cylinder pressure once you throw a ton of boost at it anyway, they just need to be tight enough to get a decent seal to retain compression.

N1, ^^ he's the reason people ask car questions here. tongue.gif But shouldn't this have gone in the White Ghost thread?

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