Pics of pistons

[Tom Sharpe]

yes, that too

Programmer wrote:

> >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
> ----- Original Message -----
> From: <A70Duster at aol.com>
> To: <diy_efi at diy-efi.org>
> Sent: October 14, 2001 8:54 AM
> 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.
> >
> > Thanks,
> >
> > Mike
> >
> >
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