Paul,
Been following this thread and if I had to recommend it to a customer I
would use L/LE Phenolic. If it works for a thermal spacer under a carb,
it should work for the throttle plate spacer. I would stick it down on
the cnc on a scrap piece of acylic, drill holes , put in a few srcews
and cut the profile, probably about 8 minutes cut time. Another thought
would be GPO-3 fiberglass polyester sheet.
Richard Konnen

++++++++++++++++++++++++++++++++++++++++++++++++++++
Thanks for the suggestion. I looked into phenolic.
It would work but there is no need of a thermal barrier and
the stuff is invariable more expensive to buy than aluminum.
Also water jet is a well known quantity cutting aluminum.
We would be in the R&D stage when we start cutting plastics.

Since the slide throttle is very very close to the exhaust
manifolds it does not pay to take risk with phenolic which has
a working temperature of only 250 degrees. Teflon, in case you were
wondering, is good to well over 500 degrees.

Fiberglass is kind of hard on cutting tools and you still need
high temp epoxy. Would not bother a water jet of course. High temp
epoxy is also expensive.

I see no real need to use anything other than water jet cut aluminum.
Simple and straight forward. One supplier.

BTW here is Revision 8. Tom simplified things by going to a 1/4 inch
spacer and 1/4 inch Teflon at the expense of having the spacer water jet
cut instead of punched. It made a better product however as it is
completely sealed without the add on covers around the slots. The slots in
the plate have been done away with by using a different way of
attaching the throttle push pull rod to the Teflon. Tom also shortened
it by about an inch. Minor changes mostly.

Paul Lamar


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