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Message
I'm thinking that the TB ports are affected
by
laminar/nonlaminar/turbulent flow in the TB bores influenced by
throttle
plate position/presence/etc.
-Mike
Thanks for the comments
Mike. I agree, and think it would be difficult for the TB ports to read
accurately at high velocity. That being said...
I just hung up with TWM,
and they believe those ports are completely accurate in their TB. He asked
what size TB I had, what engine, and about what HP I thought it was capable
of. After hearing all that, he said my 42 mm bores were
simply too small, and that I'd need at least 45's. When I pointed out
that my runners were only about 42 mm, he basically said "start over"
:-) He did mention the possibility of adding a crossover tube
between the two runners, to allow one to steal from the other, but I probably
wouldn't do that unless I was committed to building another intake if it didn't
work.
BTW, he guessed right
off the bat that it was on an airplane, and he mentioned that he really wished
we wouldn't put their TB's on airplanes, because it made him
nervous. I assured him that I wouldn't sue him, and that his TB was
higher quality than anything I could cobble together, so he
was actually increasing my chances of survival
:-)
At the moment, I've decided that I just
don't know what's going on yet :-) My only benchmark is Tracy's 6200 RPM
at 120-130 mph in climb, so I'll see how I compare to that this weekend (weather
permitting). I'm also convinced that the engine is producing more power
than before, due to the rapid rise in temps now, so I'll also take a look at
climb rate, and top speed at whatever altitude I can get to with the
clouds. Heck, maybe I'm worrying about nothing.
Maybe Ed will hurry up and get his
conversion done so we can get some more data. He's probably lapping his
input shaft now (which sounds a little nastier than intended) :-)
Cheers,
Rusty (maybe an ankle weight on my
right leg)
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