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Ring Gap #23757
04/22/06 06:28 AM
04/22/06 06:28 AM

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I am starting to put my stroker to gether and I was wondering what you guys set your ring gap at.The instructions say .0003 to .0004 for every inch of bore. What do you guys think?

Re: Ring Gap #23758
04/22/06 06:35 AM
04/22/06 06:35 AM

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I think I would need to know the piston brand, the ring/bore size, the thickness and style of the rings, the application it's for (street, street/strip, blown, race only etc.)and whether or not any power adders will be used.
for your average street combo .004 per inch is normal for the top ring and .0045 per inch for the 2nd ring.

Re: Ring Gap #23759
04/22/06 06:52 AM
04/22/06 06:52 AM
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440Jim Offline
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DRAM has it right, more info is needed.
On my current race motor with a 4.375" bore, hardblock, and other factors; I decided to put the top ring at 0.021", and the second ring at 0.024". I have used tighter in the past with less hp.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: Ring Gap #23760
04/22/06 08:11 AM
04/22/06 08:11 AM
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Quote:

I am starting to put my stroker to gether and I was wondering what you guys set your ring gap at.The instructions say .0003 to .0004 for every inch of bore. What do you guys think?



Are you sure that that shouldn't be .003-.004


Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!
Re: Ring Gap #23761
04/22/06 01:50 PM
04/22/06 01:50 PM

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OK guys I should have put more info so here goes. 496 stroker Ross Dome pistons around 12.8 to 1 comp. all carb NO SILLY GAS around 610 hp + - a few all race childs and albert rings and I think 3/16 thick. Its 30 over 440. Thanks in advance. Please be quick I need to get this done and to the track at least once and then so I can make it to the Cinn. CC event race

Re: Ring Gap [Re: MoparforLife] #23762
04/22/06 01:53 PM
04/22/06 01:53 PM

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Yes you are right its .003-.004 Im not a machinst and Im old and my finger shook to many times.

Re: Ring Gap #23763
04/22/06 02:03 PM
04/22/06 02:03 PM

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Last edited by DonHines; 04/22/06 02:05 PM.
Re: Ring Gap #23764
04/22/06 02:04 PM
04/22/06 02:04 PM
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Quote:

Yes you are right its .003-.004 Im not a machinst and Im old and my finger shook to many times.


------ Maybe you better get a young whipper snapper to put your motor together Just Kidding

Re: Ring Gap [Re: B1duster] #23765
04/22/06 02:11 PM
04/22/06 02:11 PM

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HAHA I do have one He went to school for high performce engines I am just checking to get some advice from the brains on this site suggest. There are a lot of very smart people on here and the best part the info is all FREE

Re: Ring Gap #23766
04/22/06 02:23 PM
04/22/06 02:23 PM

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use .0045 per inch on the top ring and .005 per inch on the second. that would be roughly .020 top and .022 second.

Re: Ring Gap #23767
04/22/06 02:26 PM
04/22/06 02:26 PM
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Brian Hafliger Offline
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Who's piston, and are the top rings std ring or gapless type?

Re: Ring Gap [Re: Brian Hafliger] #23768
04/22/06 02:42 PM
04/22/06 02:42 PM
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440Jim Offline
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With the Ross pistons, using 0.020" on the top ring is pretty normal for a 4.36" bore. You can use from about 0.016 to 0.024" on the second ring with no ill effects. The current performance thinking is about 0.002-0.003" more gap on the second than the top ring.

Quote:

Please be quick


I could have gave you this information a couple weeks ago, but you didn't post the question until the last minute!

Re: Ring Gap [Re: 440Jim] #23769
04/22/06 03:08 PM
04/22/06 03:08 PM
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i agree around .020 on the top and .022 on the 2nd. should about do it.

Re: Ring Gap [Re: 440Jim] #23770
04/22/06 05:40 PM
04/22/06 05:40 PM
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Brian Hafliger Offline
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I'd use .022 top and .028 second...but that's just me


Brian Hafliger
Re: Ring Gap [Re: Brian Hafliger] #23771
04/22/06 09:20 PM
04/22/06 09:20 PM
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moparmanjames Offline
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Ok, I'm confused
Why are we giving the second ring more gap than the top?
Doesnt it affect leak down rates?

Re: Ring Gap [Re: moparmanjames] #23772
04/22/06 09:28 PM
04/22/06 09:28 PM
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Brian Hafliger Offline
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Pressure gets trapped between the top and second ring and at higher rpm's this can cause the top ring to unseat if the pressure can't escape. So by running more clearance on the second ring it allows the pressure to escape.

Re: Ring Gap [Re: Brian Hafliger] #23773
04/22/06 11:54 PM
04/22/06 11:54 PM

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Ok well it seems .020 top and .022 second is the winner. But why does the manufactor say .003 and.004 per inch of bore.The guy I race with says keep them tight and you guys seem to run them a little looser ? Can some one please explane this to an old fart?

Re: Ring Gap [Re: Brian Hafliger] #23774
04/23/06 01:40 AM
04/23/06 01:40 AM
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Las Vegas NV
moparmanjames Offline
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Quote:

Pressure gets trapped between the top and second ring and at higher rpm's this can cause the top ring to unseat if the pressure can't escape. So by running more clearance on the second ring it allows the pressure to escape.




Thanks, that makes sense, so when running Total Seal gapless second rings, just use a large top ring gap?
Also, while we're discussing this phenomenon, when builders drill the top of the piston for ring seal, wouldn't that promote the same type of seating issues due to the higher pressure between the rings and a lower pressure behind the top ring during, say, the early portion of the compression stroke?

Re: Ring Gap #23775
04/23/06 01:42 AM
04/23/06 01:42 AM
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SoCal
Brian Hafliger Offline
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Quote:

Ok well it seems .020 top and .022 second is the winner. But why does the manufactor say .003 and.004 per inch of bore.The guy I race with says keep them tight and you guys seem to run them a little looser ? Can some one please explane this to an old fart?




All I can do is give advice on what works...

Brian

Re: Ring Gap [Re: Brian Hafliger] #23776
04/23/06 07:56 AM
04/23/06 07:56 AM

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Enough said. Thanks again.

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