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Old 08-10-2005, 03:42 PM
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rings won't seat

I rebuilt my chevy sb, honed and crosshatched cylinders, I have approx 350 miles on it now and it is still smoking, first 170 miles 2 qts oil at 350 miles one qt oil. at brake in I was very careful with it. I was having trouble with my oil sending unit so I took it easy. should have broke it in hard, but didn't.
now with 350 miles on it how can I get the rings to seat. is there anyone out there old enough to remember bon amy?? thanks

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Old 08-10-2005, 03:54 PM
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Vonamy, the old Ajax / Comet trick. Yeah hold the throttle open to about 2200 rpm and put 2 table spoons of Adjax in the carb or in the throttle body. Drive the car for a few miles and change the oil.

Chris
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Old 08-10-2005, 04:47 PM
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what kind of rings did you use?
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Old 08-10-2005, 04:57 PM
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Couple of things to try..

Doc here,

First think back REAL hard...are you sure you didn't miss offsetting the rings on a piston 90 degrees...easy enough to do when your tired and get around 5 or 6 holes..(Did I get that one or not?)

Next Since the consumption seems to be going down ... try taking it on the freeway and hammer it HARD for a short period 10, 15 miles..(assuming everything else is OK in the engine...) Then Drive the Vehicle after that, as much as 500 miles...65...55...45..35..45..55..65..or quite some distance..see if they won't seat. DO NOT drive at just one speed during attempted break in, Always vary the speed..and torque.

If not, you can try the "Old Bon Anmi" trick..worked on a few 283's and 327's in my day (back when we was poor kids....) but don't forget oil and filter flush after .. It's murder on new rotating masses..

Did you do a proper Cam break in? 2000 RPM for 5 minutes? rings should have seated then..

Let us know..

Doc
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Old 08-10-2005, 04:58 PM
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who did the machine work and what kind of oil did u use? More than likely the cross-hatch pattern wasn't right.

K
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Old 08-10-2005, 05:03 PM
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If you used chrome rings, they are hard to seat anyway. Drive it some more and do as Docvette says. Then if that does not work go the Bon Ami route.
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Old 08-10-2005, 05:09 PM
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New pistons or used? Rebored or used bore? If a used bore did how much out of round and taper? Hone with a hone or glaze breaker?
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Old 08-10-2005, 05:13 PM
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bon ama, never heard that before, tell me more, you calif guys were all ways ahead of us east coast

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Old 08-10-2005, 05:18 PM
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Bon Ami is a scouring powder like Ajax or Comet. It is an abrasive. Therefore it will scuff and help seat rings
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Old 08-10-2005, 05:20 PM
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well i take that back,deep south set me straigh
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Old 08-10-2005, 06:13 PM
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any chance you're actually sucking the oil in the pcv valve? Crappy baffles in aftermarket valve covers have driven many a builder nuts trying to figure out where all the oil is going.
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Old 08-10-2005, 06:28 PM
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doc

hey doc, i thaught you were suppose to offset the rings a little more than 90*. I thaught it was somwhere around 120*

i might be wrong it's not the first time and won't be the last

J

p.s. the roadmaster runs great, starts every time now
thanx
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Old 08-10-2005, 06:50 PM
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Rings stay in that offset position for a couple of minutes. Only way to keep them from moving around is to pin them like 2 cycle engines do.
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Old 08-11-2005, 06:12 AM
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Is it smoking out both banks all the time or just one side or is it just under a load, or at startup, or after letting off the gas? Could you have just one bad cylinder with a improperly installed oil ring package. Break in, synthetic oil or conventional?
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Old 08-11-2005, 08:55 AM
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What about a bad guide? cylinder gouged? valve stem seal leaking?


You need to do a leakdown/compression test.
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