What causes this?
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What causes this?

  1. #1
    Senior Member Flyin-Bryan's Avatar
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    Default What causes this?

    Last edited by Flyin-Bryan; 06-10-2012 at 04:25 AM.

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  3. #2
    gn7
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    Quote Originally Posted by Flyin-Bryan View Post
    To give You some insight this was an offshore marine engine with wet exhaust,I know the guy ran it low on oil and caused lower end failure,and upon removing the heads it appears his exhaust manifolds were bad causing water to enter the combustion chamber,I just tore it down and was happy with my purchase as the bore is .030 over SRP forged pistons and the Gm crank is std/std,balanced assembly but just saw this and was hoping it has been seen before,the divot is about 2" from the bottom,thanks.
    Long time period with water in the cylinder and the piston at or very near BTC. More than likely water trap in the ring pack, not on top the piston. I would imagine the rings in that particular piston are trashed more so than the others.



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    Last edited by gn7; 06-09-2012 at 12:43 PM.

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    Last edited by Flyin-Bryan; 06-10-2012 at 04:25 AM.

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    gn7
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    Quote Originally Posted by Flyin-Bryan View Post
    Funny thing is the piston and rings look great,the divot has smooth edges,it is not sharp,it appears to have happened over time
    Rings passing over it a few thousand times will sometimes tend to "smooth" things out. Rust does usually eat metal away like a mill and leave nice well defined edges.
    If you like, I could tell you its from iron eating termites.



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    Last edited by gn7; 06-09-2012 at 01:07 PM.

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    Last edited by Flyin-Bryan; 06-10-2012 at 04:26 AM.

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    Lol
    Quote Originally Posted by schick View Post
    Hold it firmly on the ground, a few pelvic thrusts should do the trick. If not repeat till satisfied!

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    gn7
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    Quote Originally Posted by Flyin-Bryan View Post
    3. If you can't reply in a non-condescending or respectful way, don't post
    If you have a better reason its there, why did you bother asking anybody elses opinion. You evidently have a much better cause.



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    Last edited by Flyin-Bryan; 06-10-2012 at 04:27 AM.

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    Quote Originally Posted by Flyin-Bryan View Post
    3. If you can't reply in
    a non-condescending or respectful way, don't post
    take it to the bike racks...at recess
    If you love someone set them free, If they come back with the cops...RUN!!!

  12. #10
    gn7
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    Quote Originally Posted by Flyin-Bryan View Post
    2. If you intend to argue, don't post
    Lets use your head here for a second mouth.
    You post up this:
    Quote Originally Posted by Flyin-Bryan View Post
    To give You some insight this was an offshore marine engine with wet exhaust,I know the guy ran it low on oil and caused lower end failure,and upon removing the heads it appears his exhaust manifolds were bad causing water to enter the combustion chamber


    I told what I thought caused that and you didn't buy it.

    If you don't like the answer I gave you, I fine with that. Not exactly sure why you think that the exhaust manifolds are BAD, or why you think that water in the combustion chambers is different than water in the cylinders, why you believe water in the combustion chamber would stay there and not go to the bottom of the cylinder and set there. But then, you are the expert. I am still dumb founded why you felt you needed any body elses opinion.
    You have the motor right in front of you. Whats your expert opinion of what happened. You ruled out water, even with the above quote, so I imagine you have a theory. Right?



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    Last edited by gn7; 06-09-2012 at 02:27 PM.

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    Senior Member Flyin-Bryan's Avatar
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    Last edited by Flyin-Bryan; 06-10-2012 at 04:28 AM.

  14. #12
    gn7
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    Quote Originally Posted by Flyin-Bryan View Post
    7. If you are posting to discredit another, make disparaging remarks or one liners, or comments with negative overtone etc., don't post.

    8. If you are bringing "bad attitude" to the thread, don't post.
    Piece of advice. If you don't like or agree with my opinion I gave you, but it where you nor anybody but your very closest friends can read it.



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    Last edited by gn7; 06-09-2012 at 02:40 PM.

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    Senior Member 2002CP19's Avatar
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    What happens when he gets to 10?!
    Quote Originally Posted by schick View Post
    Hold it firmly on the ground, a few pelvic thrusts should do the trick. If not repeat till satisfied!

  16. #14
    Senior Member Flat BROKE 612's Avatar
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    Apparently OP has no.sense of sarcasm and silky soft lady like skin... man up, people were joking till the rule book was shoved in their faces....
    If you love someone set them free, If they come back with the cops...RUN!!!

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