Pics of pistons

[Bruce]

But, but, but, you answered a guestion to Tom,   that might be grounds for
being b*tched at.
Gives a new meaning to reversion, and what happens at overlap, ehh..
Bruce



From: "Programmer" <nwester at eidnet.org>
Subject: Re: Pics of pistons
> From the second pic, it just looks to me like aluminum from the ring land
> that's
> marked that piston--not detonation marks...it'll bounce around and can
mark
> up
> every piston in a single plane intake.
> Lyndon

> From: A70Duster at aol.com
> Subject: Pics of pistons
> > << 10/4 to Greg. Go to http://www.mtco.com/~twsharpe/images/Piston2.jpg
>>
> > Question to Tom.
> > Judging by the pin location in the oil rings, I assume that you have a
SBC
> > piston with a 6" rod.  I also assume with a custom setup like that, you
> > gapped the rings.
> > What compression was the engine and how was the engine used (daily
driver,
> > drag strip)??
> > First, what did you gap the rings at?  From the damage, it looks like
the
> top ring gap was too tight, the extra heat expanded/butted the top ring
> together
> > and the weakest part of the piston broke off (valve relief to top ring
> lan) when the top ring was "seizing" in the bore.
> > If that is the case, then blaming a hypereutectic for breaking like it
did
> is  like blaming a hand tighten rod bolt that failed.
> > Looking at pic  http://www.mtco.com/~twsharpe/images/Piston1.jpg
> > it is more obvious that there are "detonation" imprints on the piston.
> Again  assume a SBC, there is damage in the quench area.  Did you notice
> (audible)  detonation/pre ignition?
> > Did you have open chamber heads?  And did you know what the quench
height
> was?
> > Sorry for the 20 questions.  I'd would rather learn from people's past
> > experience.
> > Mike


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