Snipped...

The P-P intake runner is now 7" between port and carb slide. This
is not
final, it is only for test stand purposes.

Richard Sohn
N-2071U
unicorn@gdsys.net

That is a bit short and could explain the relatively smooth P-port
idle.

I just found these pictures I took of an early wankel gen set  tuned
for

low end

torque. The engine was in a museum near Hockenheim.

Paul Lamar

Hi Richard, Paul,

at least this shows, that the butterfly doesn't have to be "as close
as
possible" to the intake port, but that there is some leeway to put
the BF
somewhere where it might be more convenient.

Thomas J.

As long as the P-port runner is short. With short P-port runners you
give up HP.
Everett Hatch did extensive experimentation with this.

Paul Lamar

There is nothing inconvenient about putting the butterfly in the
housing.  Quite the opposite, actually, since the housing has to be
bored for some kind of an insert anyway. We end up with a nice, solid
installation for the throttle body,  that does not increase weight or
complexity nor does it step on valuable space needed for other things.
     Jerry

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