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Message
Yes. As you may
recall, I also run with the TWM TB, and I also see lower MAP than the local
atmospheric pressure. That is quite likely as it should be, or if not; it
doesn’t matter. The MAP reading depends on where you measure
it.
Hi
Al, Yes, I recall that we've had this conversation before
:-)
I certainly agree
that it matters where you measure the MAP, and it would be nice if we were all
measuring it in the same place for comparison. I'm thinking of trying
to put a port at the intake flange, but I'm not sure if I have room to drill and
tap a hole there yet. I'm also not sure it will give an accurate
reading. Still, it won't give an apples to apples comparison to anyone
else.
On the dyno at WOT at
5300 rpm with a local barometric pressure of 29.5”, the MAP reading was
27.5”. At 6000 rpm, WOT, MAP had dropped to about 26.5”, and it was
putting out close to 85 hp/rotor (SAE corrected, which means actual measured of
just over 80) with 9.0 rotors. At 7000 rpm the MAP reading was 23.5” and
the power was still climbing at 95 hp/rotor.
Reading these
numbers sounds like the definition of "restriction" to me. The more
air you try to pull through the TB, the lower the pressure drops. Velocity
makes up for some of this, but I'm not sure where the tradeoff
is. If you've got
95 hp/rotor now, imagine what it could be with less
restriction.
Didn't Lynn say
they have to run chokes, or restrictor plates per the rules of
their racing class? He's producing lots of power, but don't you
think he'd love to take those restrictors out
:-)
Whatever that MAP
reading is, I don’t think that there is a significant power penalty that goes
with it.
Sorry, but I
can't see how you can say this. It seems to me that MAP is probably
the number one factor in power production.
Hoping this makes you
feel better,
I'm afraid not,
just the opposite in fact, but thanks for trying
:-)
Cheers,
Rusty (dealing
with the Ebay single rotor
guy)
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