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Rod Bushing service for 390...asap

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amc67rogue View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Topic: Rod Bushing service for 390...asap
    Posted: Feb/06/2013 at 9:27pm
IIRC the factory 67-69 Z28s did not have bushings with the full floating pins, they had a copper plated bore .
Keith Coggins 67Rogue X code
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Post Options Post Options   Thanks (0) Thanks(0)   Quote whizkidder Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 9:10pm
Originally posted by tsanchez tsanchez wrote:

Detonation


Hmmm... Hadn't thought about that, but certainly possible. The pattern caused by the pins deflecting, or squishing the bottom half of the small end hole?

Edited by whizkidder - Feb/06/2013 at 9:11pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tsanchez Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 9:05pm
Detonation
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Post Options Post Options   Thanks (0) Thanks(0)   Quote whizkidder Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 6:33pm
Been following this thread with interest. Recently pressed some pins out of stock rods after ~25,000 miles.

There is a definite wear pattern on the bottom part of the pins at the edges of the rod contact - where the small ends of the rod were clearly stretching at TDC on the exhaust stroke. The top 1/2 - 2/3 of the pin did not show as much (or any, in some cases):

Interested in thoughts/comments.



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst390 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 6:20pm
Terry Richards never ran bushings in his low 10 sec AMX for years and never had a problem..it's whatever your comfortable with...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 74Bubblefender Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 9:48am

Horse a piece for sure. Lets say you dont run a oil hole and you get gauling and sieze the pin in the rod. Then your retention rings would hold anyways. But far before this happened the oil slots for the pin in the piston would allow the pin to turn in the piston like they do with a pressed rod anyways. Do some timeline work and either way it works out. Personally I wouldnt run a floating rod without a bushing for the simple fact that it may not work out or you may never reuse that rod again. If it did and sometimes it does work out then it is again...a horse a piece.   If you end up with any gauling you could stress that area and cause a crack in the rod. Its a risk. Again this is IMHO.



Edited by 74Bubblefender - Feb/06/2013 at 9:49am
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Marano Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 9:35am
Originally posted by tsanchez tsanchez wrote:

Except diffs lol


Nicely done!

If I remember correctly that sliding and the resulting efficiency loss was what Ford was after when they developed the non hypoid spiral bevel 8 inch axle.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Traveller Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 9:21am
Originally posted by Peter Marano Peter Marano wrote:

 "  You can run very hard surface finished steels against other steels, which is why transmisions work"

Please excuse this small point of correction.


The contact on a gear tooth face should be rolling not sliding.


Actually, it's both.   There are both rolling and sliding forces on gears in a transmission. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote tsanchez Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 9:00am
Except diffs lol
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Marano Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2013 at 8:49am
 "  You can run very hard surface finished steels against other steels, which is why transmisions work"

Please excuse this small point of correction.


The contact on a gear tooth face should be rolling not sliding.
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