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Joa.
I don't seem to have any over heating problems, but you're right, air
circulation is all about pressure differential. It would seem that
everything wide open would cool better,but if you just fill the cowling
up with air, it may well not have enough movement to cool the real hot
spots. I have designed and installed a unit that introduces some warm
air to the carb intake just ahead of the carb. I removed the hose that
goes to the firewall heater connection and run it through a shut off
flapper that is operated by cable from the dash. It introduces warm air
in the air intake funnel just behind the air filter. After installing a
carb temp gauge, I can monitor carb temp and any change the "new heat",
as I call it, makes. To my suprise there was no heat rise when I applied
the "new heat". This is where pressure differential comes in. The
compressing effect of the intake funnel actually pushed the air
backwards. The solution may sound bizzare,but it works on this coupe as
it did on my last one. By putting a cover plate over the air intake with
a 2" hole inthe middle, stops the ram air effect of the funnel intake. I
have about 1/2" between the funnel and the front cowling. Even with the
front intake completely blocked off the engine would get enough air. I
have killed two birds with one stone with this setup, the "new heat" now
gives me about a 6 to 8 degree heat rise with no peceptable RPM loss. It
also gives me a cushion of safty for carb ice when in marginal
conditions. It does not affect the use of carb heat, which is still in
reserve,when needed. This setup seems to have completely eliminated the
sudden loss of power that this coupe and my first one suffered from.
Quite a large number of coupers have told me of the exact same
problem.Mostly it is put down to carb ice, when my research shows it is
realy the design of the intake funnel which tends to force too much air
into the carb in relation to what the main jet can supply. What more
can I say, except that it works and the coupe now flys happily at any
throttle setting. All this rambling was brought on by your thoughts on
pressure differential! I am NOT recommending this fix to anyone. I'm
just saying it really worked for me. I'm sure this letter will drive the
old diehards wild, --"don't mess with what doesn't work". I also do not
have to deal with the FAA.
Jon Page.
FLAK MAGNET.
CANADA.
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