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Date: Tue, 29 May 2012 17:32:38 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Injector balancing
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Mark Steitle wrote:
> Ernest, 
> 
> I don't understand how that could happen if my injectors are after the
> airbox (see attached pic).  
> 
> Mark

At idle, the intakes coming off the airbox can set up some serious standing waves that will suspend fuel droplets and
let it stick to the walls.  You're set-up is very similar to mine, in that the fuel can run downhill and air has to pass
in front of one runner before reaching the others.  Some of that suspended fuel will coalesce on the wall and drivel
down the runner, and any coming out of the middle will get pushed back to the rear (which will then be running over rich).

It would also be interesting to watch individual MAPs across the runners.  Dollars to donuts that the first runner's
inlet is at a partial vacuum compared to the rear one.

I may be wrong about the mechanism, but I know my fix fixed whatever was wrong.  I inserted a plate so that the runners
could not "see" the air intake.  The air hits the plate and spreads out before heading to the runners directly, instead
of flying past the first on the way to the second.

Going off of what I think I know, I would use a handsaw to cut a slot halfway through the plenum between the runners.
Then I would slide a partition between them.  It would essentially create three stalls that the runners originate from.
 The point being that air would not be able to go past one runner on the way to the second.