Re: Rings for a slightly worn bore
[Re: dvw]
#3187516
10/29/23 11:23 PM
10/29/23 11:23 PM
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Joined: Mar 2003
Posts: 9,099 Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Would it make sense to use a power adder top ring to seal ot up? Hellfire, Mahle GNS, etc?
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Re: Rings for a slightly worn bore
[Re: greendart408]
#3187573
10/30/23 09:43 AM
10/30/23 09:43 AM
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Joined: Nov 2015
Posts: 876 Missouri
jwb123
super stock
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super stock
Joined: Nov 2015
Posts: 876
Missouri
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The main issue with a tapered bore is that the rings expand and contract as they go up and down the cylinder, take a piece of wire and bend it enough times and it breaks, the taper does not really affect sealing all that much unless super excessive. Ring breakage is what you need to worry about. And 90% of the wear will be in the top inch of the bore, so majority of the cylinder will be straight. I used to fix a lot of farmer overhauls back when I was young, where they just run a hone and installed rings, I used to pull the pistons out and just shake off the rings. I would use just a normal ductile iron moly face ring on a couple thousands taper. What I do is run a rigid hone down the bore a few strokes and all the wear spots in the cylinder will be easy to see and measure, out of round is what keeps rings from sealing, again easy to see and measure if you use a good rigid hone first. My quick and dirty rule is, if you can catch a ridge with your fingernail at the top of the bore, it needs to be bored.
Last edited by jwb123; 10/30/23 09:44 AM.
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Re: Rings for a slightly worn bore
[Re: greendart408]
#3187576
10/30/23 10:10 AM
10/30/23 10:10 AM
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Joined: Jan 2003
Posts: 10,714 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,714
North Dakota
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What’s the best rings for a performance build that has a slightly worn original bore. It’s a standard bore 340 that we torque plate honed. Has a couple thou taper. Using up parts I have accumulated. Moly top? Non moly? I’m not used to builds like this. Napier second? I’m buying new so I want the best performance. If this is an accurate statement meaning 0.002" taper, there is no concern here unless this is a full race motor. When I had no bucks I've re-rung motors with 0.014" taper. They're not 100,000 mile engines but sometimes you do what you have to do. Cab's recommendation is what I would do.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Rings for a slightly worn bore
[Re: dvw]
#3187581
10/30/23 10:23 AM
10/30/23 10:23 AM
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Joined: May 2006
Posts: 1,073 oregon
greendart408
OP
super stock
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OP
super stock
Joined: May 2006
Posts: 1,073
oregon
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If it was torque plate honed how can it still have taper? It should be round and straight. Doug About a 3/4in to 1in area at the top of the bore wasn’t touched, didn’t want to hone it out since the piston to wall is beyond big. Used a dingle ball to touch it and then the torque plate hone after.
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Re: Rings for a slightly worn bore
[Re: 6PakBee]
#3187582
10/30/23 10:26 AM
10/30/23 10:26 AM
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Joined: Jan 2012
Posts: 2,645 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,645
Stuttgart, Arkansas
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I think any ring you put in there will be fine. No need to overthink this. No need to spend a lot of money.
2011 Drag Pak Challenger
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