Did not receive the original message with the photos and data. Can you
resend?
Thanks, and congrats!
Jon (at AOL :))
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With a carb no less. The carb is causing 5 to 8 inches of
Hg loss in manifold pressure due to venturis and butterfly
plates despite the fact it is a 58 mm carb. 58 mm is 2.3 inches
in diameter. At full throttle we were still seeing 10 inches Hg
vacuum or an absolute manifold pressure of around 20 inches of Hg.
A fuel injection system with slide throttle would eliminate most
of this loss. We should be seeing close to 29 inches Hg at sea level.
We ran out of time tuning Tracy's fuel injection sys so Dave
suggesting
getting some numbers using the carb. Dave and the folks at Mazdatrix
knocked out a carb intake manifold in one day. Not to mention
building a fine rotary engine. I need to depart for the
Paris air show on Friday morning. Will be gone for a week.
I will visit Francois and Mistral in Geneva and try and talk
him into a P-port :)
Much thanks to Dave Lemon and all the guys at
Mazdatrix that helped out. Half a dozen jet changes and we were
up and running. These guys really know their Webers.
These are the pictures and numbers for the 28 inch runner
version. This would make a good engine for the 2.17:1 gear box.
Note the torque peak is 5600 to 5700 RPM which would make a
good cruise setting.
Paul Lamar
I just realized that the long runner Webber carb combo is equalling the
hp (at 6000 rpm) of the Lemans engine with tuned intake. I'm having
understanding how this could be possible except that your runners are
slightly smaller i.d. than the LeMans and therefore more efficient at
lower rpms. Jerry
Not true. Take a closer look.
The Lemans engine generates 240 HP at 6000 RPM and ours is only generating
226 HP at 6000 RPM. I expect a bit more when we get the EFI working
with the slide throttle due to the manifold pressure loss we are
experiencing with the carb. I don't expect to EQUAL the Lemans
engine precisely because our pipes ARE a bit smaller.
Paul Lamar
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