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Engine basics => Engine set up tips => Topic started by: fernando torres on October 25, 2010, 09:56:12 AM
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I just bought the used os max. In order to convert it to controline one needs to remove the carburator and add a venturi and a nipple(since the nva is in the back of the motor). I wonder if I can just leave the carburator and fix it wide open, and adjust the needle accordingly?
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Sure...It works well...many C/L flyers use it just like that...wired open then adjust the needle for your run.
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That's exactly what I do. I fly the plane with the carb open and the needle leaned comfortably for good fuel mileage. Then I begin lowering the prop pitch until I get close to the lap speeds I want. It's usually still a little fast, so I reduce the carb opening until I get the RPM down to a comfortable lap time. Now I've got good lap times and excellent fuel mileage. I bolt a wire from a motor mount bolt to the carb arm and just adjust the carb arm to get the RPM I want. Works very well for me. I'm flying a TT 42GP, OS 45FSR and OS 46LA. Works great on all these engines.
Paul
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Or Fernando, you can use standard OS parts to convert it. Take the rear NVA off and use the FP25 Venturi, Tower No.LXCW99, and the front NVA, Tower No. LXCR49.
It's a straight drop in.
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Or Fernando, you can use standard OS parts to convert it. Take the rear NVA off and use the FP25 Venturi, Tower No.LXCW99, and the front NVA, Tower No. LXCR49.
It's a straight drop in.
...And if it's an early .40LA with the integral RNVA you can replace the backplate with aluminum one from a .40FP. (+ a gasket)