Richard Sohn  wrote:

In developing the intake system for the one-rotor, I got some
surprise. When I got to the point of running both ports, side and
P-P, on one carb each, I tried
to coordinate the cup(close-up butterfly) with the carbs, there

was

no impact from the cup at idle or anywhere else up to 3500RPM.
Starting the engine with
the cup full open was normal. Naturally, I removed the  cup and

the

engine is just running fine. Throttle response with the P-P carb
alone is very smooth and
solid. Idle speed is now at 1500RPM with the mixture not

optimized

yet.
So much for the cup in my case only.
If what I observed here holds up, the combo port idea may be dead
making the one rotor a more simple and better engine.
This also reminded me of the NSU Wankel Spider, which did not

have a

cup and was running very fine.

I don't understand what you are saying here Richard, what is the

link

between the cup (cub?) and the combo port idea being dead?   Why is
this idea maybe dead?  This is not clear from your post.

Hans

Sorry, my typo, I meant to say "cub"

What I am saying is, if the engine is idling stable at 1500RPM and

responds

to the throttle opening relaiable on P-P only, there is no need for

special

measures such as close-up-butter fly or side port for idle. (all that in

one

sentence).
Hope this is clear.

Richard Sohn
N-2071U
unicorn@gdsys.net

Richard a lot depends on the length of the intake runner. How long is
yours?

Paul Lamar

Richard wrote:

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
 
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