RE: forged rod on that piston?

John Goodyear (jjg@optsys.com)
Mon, 23 Nov 1998 14:26:45 -0500

Francois,

>Ok, I have a replacement piston. Looking at it, it seems like
>it is a very nicely constructed piston, but what do I know.
>The connecting rod looks like it's forged. How can I tell?

?

>I'm not sure what I'd gain with forged pistons unless I change
>the crankshaft and put a Danielson head, no? I'm sure the
>head will bust before the piston.

I am not sure, I copied a message to the list once, regarding a 400hp
Conquest that cooked it's engine 3 times without ever hurting it's stock
head. I don't know the details of the failures, Maybe they were just from a
bad engine builder. Why a new crankshaft? I thought we confirmed that it
was forged?
Head bust before the piston? Doesn't your car have a good head with a
toasted piston?

>I think the ideal would
>be to build in parallel another engine, over a year or two, do it
>right, and I'll have more experience with the turbo by then, and
>swap them etc...

Yes I agree but, I also believe if you are rebuilding the engine you REBUILD
the engine. I.E. Once you are internal, you build it so it will handle
everything you can conceivably think of doing to it in the future.

>What I think I will do is remove all the pistons, not just the one
>that is damaged, inspect them with a micrometer, compare to
>specs, put new rings, put everything back. I'll change all seals
>and gaskets in the process, and might as well put new headbolts.
>Like I said the head has been replaced once already, maybe more
>than that in term of retorque, so there is probaly fatigue on these
>bolts.

That's better, Maybe not the extreme I was suggesting, but much better than
slapping in a piston. At least you will be able to thoroughly inspect
everything and the engine will be fresher when your done.

Ciao,
JJG