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05-16-2008, 04:41 AM   #40 (permalink)
Mikes66
 
Join Date: May 2006
Location: Salem, Mass
Posts: 1,627
Re: Lost a Motor last night.

Quote:
Originally Posted by mavman View Post
Did anyone not notice in the one picture that the number two piston was turned in the bore?

Telltale sign of bottom end failure--rod or crank.

.

We all must be BLIND...!!! Good catch.... I think we were all looking at the exhaust valve impacts and not looking at the piston orientation.

But, what happned first the valve hitting the piston causing the rod / crank to break, or the other way around?

Hard to tell in the photo if there are any valve impacts on Piston number one. It is too dark, but it looks clean. If there is....then:

If the crank was broken first, then the vavle impacts would only be after the crank break, and not on both sides of it... Is this correct? The front part of the crank that is not broke should still be in tune with the timing of the valves.... and not show any valve impacts....right? Unless the chain broke because of the crank break....

Maybe the OP can clear this up for us... Did the OP notice the twisted piston?
______________________________________
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What is life worth, if everything comes easy...?
66 Stang 385+ HP 306 .494 /.520 225 durr @.05, 200cc Windsor Sr's, Edle RPM, C4, 3.00 posi, 575 Annular Mighty Demon, 22 MPG,

Last edited by Mikes66 : 05-16-2008 at 04:45 AM.
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