Al Gietzen wrote:

Please - it is 86 /rotor at 6000, 93 /rotor at 7000.  And I guess I
should say that I'm not entertaining any discussion on the subject

until

I see some actual dyno data on a stock NA rotary engine in an aircraft
that does better.  The only data I have on a similar engine with a
"tuned" manifold is the data on the all aluminum 4-rotor, which mine
beats by a couple of hp /rotor.  That, of course, is not to say that
some other intake manifold configuration may not be a few percent
better, I think it should be.

Al

The four rotor engine you speak of was also built by the same guy
that built your manifold. Here is a picture of that engine. It has the
same "Y" in the manifold runners.
PL

Nope; different guy.

But it was the same four rotor was it not?

The Mazda  Lemans four rotor with the tuned intake is 120 HP per rotor
at 6000 RPM.
Here is a HP curve on that four rotor engine.
PL

You've dug that curve out so many times I'd expect it to be faded by now
:)
Very different engine.
Al

Wow! At $50 an hour that manifold cost you a bunch. 32 to 40 hours is
$1600 to $2000. I hope he was working at day labor rates :)
Not including the pricey TWO stuff. It is easy to make things
light weight if money is no object.
PL

Money was definitely an object.  Fortunately he only charged me half
that rate.
But with final heat treat and all, it was too expensive.  It is compact
and light weight; two important factors that I was after
Al

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