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Thanks, Tom....Fortunately I was already aware of that. That is one of the reasons that the Marvel aircraft carburetors have manual mixture controls. I will check with Yaw Power Products just in case they may know of an manual mixture conversion kit or ??? thanks again. Paul Conner

----- Original Message -----

From: Tom

To: Rotary motors in aircraft

Sent: Sunday, February 27, 2005 6:49 PM

Subject: [FlyRotary] Re: Weber carburetors

Hi Paul,

There's something you might want to read regarding tuning carburetors for getting ultimate performance out of them. I think Leon already mentioned carb jets.

The short of it:

1) the best carb jet to be used can be effected by atmospheric conditions and the inevitable change in fuel regulator pressure,   Being in an airplane confuses the situation.

2) apparently fuel regulators don't usually keep the same pressure over time, they recommend a pressure monitor and adjustible fuel pressure regulator. Occasionally you would want to re-adjust the pressure

http://www.yawpower.com/racecarb.html

and then...

http://www.yawpower.com/secret.html

Also, they offer carburetor, pump, & regulator packages. Probably no pilot-adjustable mixture control.

Tom, just a parrot



Paul <sqpilot@bellsouth.net> wrote:

I am still looking at carburetors for my 13b. I haven't decided to ditch the EFI yet, as I have the maps set up now and it seems to be producing good power, and runs smoothly.   After talking to George Graham, and seeing that Ron Gowan also had a carb on a 13b, (as well as Finn and I believe the gentleman who had a Coot amphibian), it would seem that there are some success stories with a rotary and a carb.

    Now that we are talking about PM alternators, with around 35 amps, it would seem that if I had a carburetor instead of EFI, my electrical current needs would be considerably less. (No injectors to fire, no high pressure fuel pumps, etc). I could also eliminate the need for a fuel return line to sump tank, handheld ECU programmer, etc.

     Of course there are downsides to carburetors as well, such as the need to provide inflight leaning of the mixture and carb heat. The carb heat is the easy part. (not very far from the exhaust). The real challenge would be providing for inflight leaning of the mixture. If anyone has seen a succesful modification of a Weber carb for inflight leaning, I would appreciate any info you might have? Thanks in advance for any and all replies. Paul Conner
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