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Re: Ring compressors that work good?
[Re: onig]
#1692998
11/04/14 05:53 PM
11/04/14 05:53 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
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OP
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Nebraska
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Because there is a support rail under the oil rings.
Mopar to the bone!!!
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Re: Ring compressors that work good?
[Re: 72Swinger]
#1692999
11/04/14 08:58 PM
11/04/14 08:58 PM
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Joined: Jul 2008
Posts: 361
Canada
onig
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enthusiast
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Canada
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OK, I see it now.
I agree that the support ring could and should have a larger OD.
69 Dart
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Re: Ring compressors that work good?
[Re: onig]
#1693000
11/04/14 09:38 PM
11/04/14 09:38 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
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Quote:
OK, I see it now.
I agree that the support ring could and should have a larger OD.
Not really. The support rail only takes up space in the groove. With the oil package oriented right and compressed, that will be fine.
The op said the rings were "shaving" alum from compressor. My guess is the scrapers are not seated in the expander properly and are jumping out and catching on the support rail as shown here. The ONLY other way shaving could happen, is if the ring is actually too wide for the ring groove. IE, the ring is a .210 wide ring and the groove is cut .170 or something similar. If the piston easily slides through the compressor, it should with the rings loaded as well.
Groove vs ring width is easily checked with calipers. I know you have another set of rings ordered, but don't just assume all is well......CHECK IT
Monte
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Re: Ring compressors that work good?
[Re: Monte_Smith]
#1693001
11/04/14 10:22 PM
11/04/14 10:22 PM
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Joined: Jul 2008
Posts: 361
Canada
onig
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Quote:
Quote:
OK, I see it now.
I agree that the support ring could and should have a larger OD.
Not really. The support rail only takes up space in the groove. With the oil package oriented right and compressed, that will be fine.
You could and are probably right in your statement.
If the support ring had a larger OD the chances of the oil rings sitting/butting on top of the support ring would be much less and allow an easier install without damage. In situations like this it would be suggested to try and push in the rings at their gaps and then compress them to install into the cylinder. That's how I am looking at this. I will be doing a Hemi in the future so this is good info.
Last edited by onig; 11/04/14 10:24 PM.
69 Dart
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Re: Ring compressors that work good?
[Re: Monte_Smith]
#1693002
11/04/14 10:23 PM
11/04/14 10:23 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
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I have a single set of the Mahles that I have already measured and compared. Ring depth was never the issue but .010 over oil expanders were since I was never aware what I was up against from the beginning. This is something that the builder needs to know IMO.
Mopar to the bone!!!
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Re: Ring compressors that work good?
[Re: 72Swinger]
#1693003
11/04/14 10:44 PM
11/04/14 10:44 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
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Quote:
I have a single set of the Mahles that I have already measured and compared. Ring depth was never the issue but .010 over oil expanders were since I was never aware what I was up against from the beginning. This is something that the builder needs to know IMO.
This just comes with experience, because as I stated earlier, to make an oil ring package "heavier" as in 15lb vs 25lb, the way you do that is compress the expander more, which puts more outward pressure on the scrapers. This obviously means the expander is "bigger" in diameter and therefore harder to compress for installation. This can be a real pain on 3mm ring packages.
Guess I am just used to the "grief" because I use heavy oil rings in all the nitrous motors I do and order sets for the lbs I want. When you lay the expander in the groove with the ends butted and it hardly protrudes from the groove, that is a fairly low tension ring. The heavier the package lbs wise, the more expander you will see "outside" the groove when you lay it in there and butt it up.
Monte
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Re: Ring compressors that work good?
[Re: Monte_Smith]
#1693004
11/04/14 11:06 PM
11/04/14 11:06 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
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I think these rings are an application where the plier style compressors would shine. Im confident the 20lb vs 24lb wont make or break this engine. I appreciate your experience Monte and your points are valid. I have NEVER heard of the need to "pre-crush" oil expanders during an engine build. But this is why I post here when I have an issue like this. I want everyone to know that this stuff is out there and share my experience.
Mopar to the bone!!!
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