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Hi, Ken thanks for the information. I did save a similar message that you previously sent describing how you used ram air to control the mixture on your Weber. If required, I could probably construct a similar system (If I pestered you with a few more questions). I was just hoping there was a simple solution, such as someone who came up with a mechanical lever type mixture modification for the Weber. I could easily weld or machine a slot in the mixture adjustment screw and attach a cable, but I suspect that the mixture screw would need to be turned in or out several turns, which a simple lever attached to the mixture screw would not accomplish. It might possibly turn the mixture screw 1/2 to 3/4 turn at max, which I suspect would not be sufficient enough to lean the carb enough for higher altitude. Thanks again for your input. I have also saved this posting just in case. sincerely, Paul Conner
----- Original Message ----- From: "Ken Welter" <rotary.coot@verizon.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, February 27, 2005 9:00 PM
Subject: [FlyRotary] Re: Weber Mixture control
I have mentioned this before but in case you missed it here it is again.
I control my mixture on my Weber with an air ram, the two ram tubes
are set about an inch away from the velocity stacks and the float
bole vent is to the side and below the stacks so when the ram is
opened it changes the pressure difference between the float bole and
the Venturi thus leaning out the fuel mixture.
In cruise I can open the ram until the rpm peaks and then when it
drops I know that I am on the lean side of peak and the close it
until it peaks again for the best power.
Also note that my plane only cruises at about 100 mph so you guys
with a faster plane will get more ram effect and more leaning effect,
on my plane the leaning lever is wide open at 16,000 ft
Ken
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