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Here is the induction system set up I first flew with
Phtos MVC-007F JPG). 4 injectors into a TWM dual throat Webber Throttle
body (2" dia throats) into a two into four manifold. The engine started
easily and operated fine - with the exception it was low on power. Top
speed was 185 MPH TAS.
The apparently problem was that while this set up did well
for the rotary racing crowd when theirengines hit 9000 rpm - it sucked (but not
very well) at the lower rpms like 5000. So I swap it out for my current
design using an 65mm dia mustang throttle body and smaller diameter runners and
immedately picked up 10 MPH top airspeed and 400 ft/min improvement in Rate of
climb.
It was the beginning of my understanding that what works
well for one environment and set of operating conditions may provide lousy
results under different circumstances. The other two photos show the
intake that produced the best results for my installation and which has now been
on the aircraft for over 6 years, top speed achieved with this intake was 196
MPH TAS with the old 2.17:1 and 68x72 prop. Same intake with the 2:85:1
and 74x88 prop topped out at 200 MPH TAS.
Ed
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