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Re: Throttle Body & Intake Manifold Polishing
In a message dated 8/30/99 5:09:30 PM Eastern Daylight Time,
<< Although this issue has been covered in the archives, I still have a few
I have an 88 80q I5. There is a leak in the intake manifold gasket, or that
it what I assume, so I have to take it apart anyway.
1) What should I use to polish the throttle body and the intake manifold ?
2) Is there a point where the throttle body and intake manifold can be too
I can have the whole thing electropolished, but will it be too smooth ?
A friend voiced a concern that with carborated motors, you could get things
too smooth and the fuel would not mix correctly.
3) Has anyone done this before, or even high grade polishing ?
I have ported a few intake manifolds. It is quite easy on the later two
piece, I have used a sanding stick and sanding rolls to do most of the work,
and finished with a medium cross buff (from Standard Abrasives). A sanding
stick is a 1/4" rod with a 7/8"cut in the top to hold an 8" piece of
sandpaper strip that is rolled around it. First hit it with some 80 grit
sand paper rolls (WD40 help here) till all the roughness is out of the
casting (port matching should also be priority). I'm not sure how importand
turbulence is in the IM, but it is important to have a reletively rough
surface in the intake ports in the head (say a 120 grit finish). I also work
the insid of the chamber where the TB bolts up, removing a little material
here and there and smoothing things up.
I would not spend too much time on the TB, a little polishing there is
going to be very negligable. Dont forget that that basic TB is also used on
the 20valve's which are flowing quite a bit more air than your 10v. We are
not talking huge power with any of this stuff, put is will help in extenting
your rev range slightly as it did in my coupe GT (see web.csuchico.edu/~javad)