Re: holy smokes.. destroyed top rings
[Re: MoparforLife]
#655224
03/29/10 08:43 PM
03/29/10 08:43 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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I'd think the pistons are probably junk in the ring lands... Did you measure the clearance between the ring and land? Also, lok at the main caps on the mating surface. Look for signs of movement from detonation.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: holy smokes.. destroyed top rings
[Re: 1fastrunner]
#655233
03/30/10 03:05 PM
03/30/10 03:05 PM
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Joined: Oct 2005
Posts: 708
Mechanic Falls, Maine
4BBodies
mopar addict
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mopar addict
Joined: Oct 2005
Posts: 708
Mechanic Falls, Maine
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I'm sorry for your destruction, but I have to ask everyone a general question........even if there was a ridge, isn't that at the upper most travel of a piston? As in, even if the rings hit the bottom of it, aren't they already at the top of the stroke? Unless the stroke or pistons are changed, I can't see how the rings can go higher than the ridge and cause that must damage. I have done several engines, and taken the ridge down as far as the reamer would allow, and then honed. The one I took apart so far, after a few thousand miles, was fine..........the rings were just wearing in a new spot below the old one. I know the right way is to bore it, and I have done that as well........but sometimes it isn't necessary/feasable.........even my rebuild books mention getting it to where it is smooth. Just wondering where you guys get this stuff.......... I hope you can fix yours!
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Re: holy smokes.. destroyed top rings
[Re: RapidRobert]
#655235
03/30/10 04:01 PM
03/30/10 04:01 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Quote:
even if there was a ridge, isn't that at the upper most travel of a piston?
On day 1 yes but the outer top corner of the ring starts to wear in a bevel as does the mirror image ridge being created then a new square ring hits the imperceptable bevel in the wall half and at piston speeds this contact is what breaks the rings
  New fresh edge on rings hitting the ridge at speedeven an amount that the human eye would not really register will create quite an impact and will/can break the rings and lands.
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Re: holy smokes.. destroyed top rings
[Re: MoparforLife]
#655236
03/30/10 05:28 PM
03/30/10 05:28 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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You say the ridge was removed but a flexi hone won't do it. I think you need to have the block honed at a shop that will measure the bores and get them properly done. I think that's you're problem. The new rings will feel something much more than you fingernail will, and a mild rounded lump that used to be a mild ridge will catch the rings, twist them in the ring land, and break them. In addition to destroying the ring land surface. Rings seal in two areas. The bores, and the ring lands.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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all but one came out in many pieces, i'm talking like 10 small chunks and then 2 large semi circles. just the top rings everything else looked normal. these were the stock std. pistons with std. stock rings with a hone job. all the ring gaps were good or on the big side so they weren't tight. the last couple that i pulled i tried to see where they were most broken and they seemed to be at the ends of the pins, don't know if that means anything or not. this motor pushed my 3800lb bee to 
