> If the top rings were broken in three our of four pistons, I'd suspect it had
> something to do with the ridges that build up over time at the top of the
> cylinder walls.
(SD): There is almost no evidence of any ring ridge
>
>
> Perhaps new piston rings or assemblies were installed in the past without
> reboring the engine. Honing alone won't totally remove the ridges.
(SD): To my knowledge, the engine has never been apart. Are there any identifing
marks to stock pistons? The connecting rods are each punched with a dimple, ( 1
-
4 on bottom)
>
>
> Or perhaps the engine was regularly run and broken in at lower rpms, then
> over-revved on the freeway or at an autocross.
(SD): I think it was always drive pretty gently. Only 1000 miles put on it in
the
last 10 years.
>
>
> How long had the engine sat without firing? Any sign of rust?
(SD): No signs of rust. I crank it over monthly (but do not start it) during the
winter months. I doubt the PO did...
>
>
> Any sign of pre-detonation damage to any of the pistons?
(SD): Nope...
>
>
> Dick Sanders
> Seatte
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