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Chrome moly rings |
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48GASMAN 
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Joined: Jul/08/2007 Location: United States Status: Offline Points: 83 |
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 Topic: Chrome moly ringsPosted: Aug/16/2013 at 8:39pm |
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Hello, picked up a 390, person said rings never seated, any thoughts, hone marks look good in cylinder walls, change rings or ?? Thanks
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amx39068
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Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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Posted: Aug/16/2013 at 11:30pm |
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Go drive it like you stole it. It takes a good 2500 miles to seat moly rings
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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purple72Gremlin
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Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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Posted: Aug/16/2013 at 11:38pm |
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crosshatch may be part of the problem. as above, drive it hard. that will get them to seat if the cylinder walls are ok.
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6PakBee
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Posted: Aug/17/2013 at 7:57am |
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How many miles does the motor have on it and what kind of rings are in it? It's been my experience that chrome rings can be a bugger to break in but chrome-moly rings should seat in relatively quickly. Definitely under 100 miles if everything is right. Why did the former owner think the rings had not seated?
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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48GASMAN
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Posted: Aug/17/2013 at 8:11am |
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I was told the engine smokes and compression might be low, I just purchased this complete package, engine is 390 12.5 to 1 comp. big cam,
supposed high horse but you know about that and no dyno sheet, car went 9.6 in quarter mile? |
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6PakBee
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Posted: Aug/17/2013 at 8:24am |
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Boy, that's not much to go on. You apparently have the heads pulled, what did the top of the pistons and the combustion chambers look like? That should give you a clue about oil consumption.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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purple72Gremlin
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Posted: Aug/17/2013 at 8:56am |
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amx39068
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Posted: Aug/17/2013 at 10:13am |
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If it a 12.5 compression that ran 9.6 in the quarter then was it a race only engine? If so, 1/4 mile at a time does not add up very quick. The engine I am redoing bearings on had less than 1500 miles and there was only a smidgen of the surface on the moly rings that showed typical break in smoothness so they were a long way from fully broken in at 1500 miles although they seemed to be seated well.
From what you are describing it sounds like the engine was put together with a "loose fit" build for racing which a lot of old school guys used to do and which caused the engines to burn a little oil. Did you check the valve seals and guides to ensure the oil consumption is not coming from the top?
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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48GASMAN
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Posted: Aug/17/2013 at 1:33pm |
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I am just getting it off the trailer, I have pulled the heads but the pan was pulled, I have some work to do before I believe the 9.6. I did not hear it run but talked to a machine shop that listened to the motor and witnessed the smoke, that's all I got to go on for now, all this is coming from the seller and the machine shop he uses the motor was put together down in Ocala fla. Looks like a tear down will be the best bet and see exactly where the motor is at, Will keep you updated as I pull it down.
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6PakBee
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Posted: Aug/17/2013 at 3:15pm |
Good plan.  |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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48GASMAN wrote: