Paul,

I saw the video.  Again.

Any ideas why the P-ported Renesis had a fuel cloud  around it  at high rpms?  Easy answer is it isn't being sucked in:)   Others I suspect was  over fueling, which is understandable in a quick and dirty test.  What I am most concerned with however is that you might have reintroduced an overlap  into a design that engineers worked hard to eliminate.  To eliminate this over lap the P-port inlet will have to be much higher. That will cause other breathing problems at lower rpms.

When I see that video my impression  was Holy Cow!  I'm glad there wasn't a backfire. Not a good image to promote for aviation use. The second thought is why bother? Counter productive to all your fine work with 13B p-ports and its parts thereof.

 My two cents.  Lets focus on promoting dual P-ports. Easy, proven, and  a better exit flow for turbo applications.  Yes and you'll like this.cheaper.  The logical upgrade for guys wanting a lighter engine is to go to all aluminum engine.  We can do a group buy and get a dealer price from Racing Beat?  Put my order in.   None of this can be done  with a Renesis config.

The Renesis 'as is' is more tolerant of high back-pressure but at the penalty of losing more unrecoverable energy to the cooling system.  The merits of the engine compared to the 13B are its three moving parts which can be put in the 13B.  This as you know makes a one-half Lemans style engine.

The Renesis is a transition engine.  Not bad per se but highly over hyped. The 16X. if and when its available may be the engine that needs the least amount of modification for aviation and has an acceptable power to weight ratio.

Doug in Japan

Apparently it is phenomena only with carburetors. In theory a tuned intake
has air flowing both in and out of the entrance to the runner. In a carb
system the air flowing out of the runner sucks fuel out of the fuel jet and forms
a fuel air cloud over the engine. I built a ram air box for the 2D and 2F Chaparral
to contain this fuel cloud other wise it would get blown away in a race
with a low MPG result.

I was worried about this with Mark Supinski so I bugged him about
a ram air box on his p-port 13B. Turned out we did not need it as there was
no sign of stand off with the top of the ram air box wide open and
fuel injection.

I don't agree on the overlap theory.

Paul Lamar