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Ed, Mistral said that the problem they encountered was response time and slightly lower BSFC. They just put together a new manifold that looks very nice. They are convinced that they need near-the-port injectors however.
Bill Jepson
In a message dated 1/21/2005 9:12:09 AM Eastern Standard Time, "Ed Anderson" <eanderson@carolina.rr.com> writes:
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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