Jerry,
 In a recent posting "over there" Francois at Mistral did mention the one item I feared as a problem. Upstrream injecting can cause icing inside the runner. They claimed to have experienced this. Since you are passing a fuel air mixture through the tube you can experience the same difficulty as a carburator, though for different reasons.
Bill Jepson

In a message dated 1/21/2005 9:47:37 AM Eastern Standard Time, "Ed Anderson" <eanderson@carolina.rr.com> writes:

Jerry, I don't really know if anyone has run/flow with Paul L's crossover
intake.  However, if they are not turbocharged they are not likely to be
experiencing any detonation - just perhaps some uneven running - if, indeed
any problem associated with distillation exists.

Ed A
.
----- Original Message -----
From: "Jerry Hey" <j-winddesigns@thegrid.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, January 21, 2005 9:24 AM
Subject: [FlyRotary] Re: Pport/cold side injectors

Ed,  is anybody running an engine with Paul L's crossover intake?   If
distilation is an issue, they would have experienced it too,
presumably.  Jerry


On Friday, January 21, 2005, at 09:12  AM, Ed Anderson wrote:

The Swiss Mistral rotary folks reported that when they went to long
runners
that they believed they encountered  a "distillation" problem as Ernest
mentioned.  Due to this problem they believed that they encounter
detonation
with their turbo set up due to the "Low Octane" part being ingested at
a
different time than the lighter high octane part of the fuel.  I am
certainly not enough of a chemist to even know if this even sounds
plausible.  However, the team did have a Chemist and that is what he
reported.

I must admit I'm a little bit skeptical of this mode as it would seem
that
even if it happened you would have a continuos stream of light and
heavy
elements intermixing between one injection period and the next.  But,
they
certainly had the resources and inclination to look into the problem
and
that was their conclusion.

Ed A


----- Original Message -----
From: "Ernest Christley" <echristl@cisco.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, January 21, 2005 8:48 AM
Subject: [FlyRotary] Re: Pport/cold side injectors

On Thu, 2005-01-20 at 20:41, Jerry Hey wrote:

Thanks Ken,   I want to try to make cold side fuel injection  work.
Idon't see any reason, YET,  that would indicate the system would
notwork.  But if it does not work, then I will COPY  your set up.

I have seen carburetor intakes on P Ports with about  a  12 inch
runner made from a 90 degree sweep.   They were turning out  huge
power.    Jerry

Check the FlyRotary archives.  There was some discussion of long
runners
a while back.  I forget who it was, but they found that the fuel will
'distill' in the runners.  The lighter compounds get sucked out and
ingested immediately.  The heavier parts fall behind and get taken in
as
clumps.  The end result was that the engine wasn't breathing a nice
even
mixture, but a uneven combination of light petroleum gasses and balls
of
oil.

At least that is how I understood it all.

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