I have first hand experience with "expansion factors". A factory built '96
Chevy
SS Camaro uses a cast iron block and cast/high silicon content aluminum
pistons. These two have vary different thermal expansion rates. That's why
this
car clatters so much till warm. (It's kind of embarrassing on cold days.)
Basically
the pistons have to expand to the size of the bore before they stop making
noise. I too would consider this to be a "loose" engine but it doesn't smoke
.
I would agree that any engine which is so loose as to smoke is way too
loose.
Lonnie
----- Original Message -----
From: <ADvent@thuntek.net>
To: G. Simmons <gls@4link.net>
Cc: Grant Galbraith <trks@javanet.com>; oletrucks <oletrucks@autox.team.net>
Sent: Monday, March 06, 2000 9:03 PM
Subject: Re: [oletrucks] Smokin 235
> Thats a new one on me. This engine building technique would not be legal
in
> Calif. It wouldn't pass smog. I don't think I would want them building
anything
> for me. Smoke? Who wants an engine that smokes, not me. I bet during WOT
there
> is a significant amount of blowby going on.
>
> "G. Simmons" wrote:
>
> > The rebuilder on my old Buick told me that they always make the pistons
and
> > rings fit a little looser than stock because the replacement pistons
have a
> > tendency to expand a little more, and of course, the walls are that much
> > thinner. So he said to expect a little smoke until the operating heat
comes
> > up.
> >
> > I must say that what you describe sounds more like an unrebuilt engine.
> > Maybe the rebuilder could be helpful, since the problem may reflect on
his
> > workmanship.
> >
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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