<VV> An interesting thing.....

[Roger Gault]

If you look at the reference in How to Keep Your Corvair Alive, you'll find
that Finch doesn't mention Viton o-rings.  With the original o-ring
material, heat was a major problem.  With Viton, the problem is pretty much
solved.

Finch's entire scheme here included painting the exhaust tubes and putting a
.020" aluminum shield between the exhaust and pushrod tubes.  All of this
will certainly reduce the radiated heat transfer to the tubes, making the
o-ring run cooler.  Whether that matters to sealing and life with Viton
o-rings is arguable.

There's also the question of whether this lowers oil temperatures.  I
haven't seen any data that convinces me that heating of the oil in the
pushrod tubes is a significant contributer to oil temperature, but I've
painted the tubes for the 3.6L motor just because it might help.

Roger Gault

----- Original Message ----- 
From: "Sadek Charles H DLVA" <SadekCH@NSWC.NAVY.MIL>
To: "'Ron'" <ronh@owt.com>; <virtualVairs@corvair.org>
Sent: Friday, February 04, 2005 1:51 PM
Subject: RE: <VV> An interesting thing.....


> Ron,
> The theory was stated that as white doesn't absorb radiated heat as
> quickly as black does for example, then any little bit of help that the
oil
> could get to not get any hotter than it gets from the engine itself, would
> be helpful.  Furthermore, why take a chance as it was easy and helped
peace
> of mind?  IF one examines the tube placement in an air stream, with or
> without shrouds, we see the air is constantly flowing over the tubes and
> white is not much better than galvanized steel or whatever that coating
is.
>
> Probably doesn't help much but doesn't hurt either.
>
> Chuck S
> BBRT
>
>
> -----Original Message-----
> From: Ron [mailto:ronh@owt.com]
> Sent: Friday, February 04, 2005 2:38 PM
> To: N. Joseph Potts; Dave Morris; virtualVairs@corvair.org
> Subject: Re: <VV> An interesting thing.....
>
> Painting them a color or no color has to be an old wives tale with no
> credence.
> RonH
>
> ----- Original Message ----- 
> From: "N. Joseph Potts" <pottsf@msn.com>
> To: "Dave Morris" <BigD@davemorris.com>; <virtualVairs@corvair.org>
> Sent: Friday, February 04, 2005 11:23 AM
> Subject: RE: <VV> An interesting thing.....
>
>
> > How does painting pushrod tubes white prevent leaks? Might green work
the
> > same way?
> >
> > Joe Potts
> > Miami, Florida USA
> > 1966 Corsa coupe 140hp 4-speed with A/C
> >
> > -----Original Message-----
> > From: virtualvairs-admin@corvair.org
> > [mailto:virtualvairs-admin@corvair.org]On Behalf Of Dave Morris
> > Sent: Friday, February 04, 2005 12:47 PM
> > To: virtualVairs@corvair.org
> > Subject: Re: <VV> An interesting thing.....
> >
> > snip
> > We paint the pushrod tubes white because Richard Finch in his book "How
to
> > keep your Corvair alive" suggests that as a way to prevent leaks around
> > the
> > o-rings.  Almost ALL of us are painting them white.
> >
> > snip
> >
> > Dave Morris
> > _______________________________________________
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