To Bob and all:
Thanks for the "heads up" on the bead blasting of the intake. I was very
aware about not blasting the interior surfaces. I duct taped the crap out
of the bottom, the port sides and the carb opening of the intake so as to
not directly blast the interior. There is, however, no way to keep all the
media out. Luckily, the only media that got in was apparently just
filtering in around some of the tape joints. After blasting, I did exactly
what "DrMayf" suggested; I submerged the intake in a bathtub full of hot,
soapy water and scrubbed it inside and out with a long brush. I ran water
through the intake ports and feel certain that I removed any and all media
material.
Bob is right about not blasting the inside engine parts. I've seen the
results of doing that and it's not pretty.
Andy Walker
----- Original Message -----
From: "Bob Palmer" <rpalmer@ucsd.edu>
To: "Andy Walker" <awtiger@ix.netcom.com>; "Tiger List"
<tigers@autox.team.net>
Sent: Monday, September 03, 2001 8:25 PM
Subject: RE: Messed up F4B
> Andy,
>
> This reply is predictable to those on the List that are familiar with my
own
> experience with a bead-blasted intake manifold. Hopefully, you only bead
> blasted the exterior surfaces, otherwise you need to take extreme measures
> to ensure that all the media is removed from the surfaces that contact the
> oil, plus all the air intake passages that also provide a way for the
> abrasive glass media to get into your engine. I might suggest an acid
> treatment, muriatic acid (HCl) as a way to release the tiny chips of glass
> embedded into the aluminum. Better yet would be hydrofluoric acid,
followed
> by chromic acid, but you probably don't have access to that. You can get
> some aluminum prep at a paint store though; finishing up with this should
> leave the aluminum with a nice white appearance, although where it matters
> to the engine, you can't see it anyway. (Are you going to polish the top
> surfaces?)
>
> The F4B is a good intake and period too, so having a helicoil installed
> sounds like a good idea, and cheaper than buying a new Performer RPM too.
>
> Bob
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