Richard 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.

Richard Sohn
N-2071U
unicorn@gdsys.net

I think the NSU used a two barrel carb. One large venturi and one small.


Paul Lamar

 
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