Kruiswyk, Neil wrote:

Paul,

        A word of caution regarding thin walled runner style manifolds.  If
your fuel atomises at the carburator (or the injectors are mounted in the
throttle body) the evaporating fuel will cause the runners to frost up,
inside and out.  This has happened to both Jim M and I.  I no longer use a
thin walled runner manifold but rather the thick walled Racing Beat Delorto
manifold.  This unit is thick enough to conduct heat from the block and keep
the runners above the freezing mark.

 On one humid summer day with my Ellison carburator setup, I did
about a 10 minute ground run with the cowls off.  In that short time I built
up about 3/16" of frost on the ouside of the pipes!!!

Neil

That is interesting. I assumed everbody had the injectors right up 
against the rotor housings. Ed is using Tracy's system right?
Tracy has them mounted near the rotor housings.

I kind of forgot some people were using carburators. A little 
manifold heat does seem to help carburator systems. Not to mention
iceing of course.

BTW with peripheral ports and the Everett style butterfly throttle
valves backfires should not be a problem. Composite tubes should
work fine in that case.


Paul Lamar
 
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