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
 
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