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Hi, Tommy....unfortunately, I am not sure how to get your idle down. I think my success was pure dumb luck. I had an intake manifold welded up using aluminum tubes from Burns Stainless and a cut and modified aluminum intake manifold from Mazdatrix, with a TWM throttlebody that came with the injectors and fuel rail already installed which I purchased from Atkins Rotary. I am using the MicroTech ECU. It had a nice, slow idle from day one. I never did any pressure, volume, or injector calculations....proving my theory that it was pure dumb luck.
I'm almost afraid to say what RPM it will REALLY come down to if you don't mind it running a little rough. I'm not sure anyone would believe me. (How about 300 engine rpm's and 150 prop rpm's). But it kinda spits and sputters with rpm's that low. Sorry I can't explain the reasons for my success. (Ignorance is bliss). Take care. Paul Conner
----- Original Message ----- From: "Tommy James" <twjames@statesville.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, November 18, 2004 8:01 PM
Subject: [FlyRotary] Re: project update
Hi Paul, I am really envious of your idle speed. Mine is around 1600. Any
ideas on how to get it down? Temps are outstanding too!
Tommy<><
Idle speed is: engine speed 800 rpm, with a prop speed of
around 400 rpm's. (2.17:1 reduction ratio). After 4 taxi runs and aborted
takeoff runs, the oil temp got up to 185 degrees. Oil temp was lower, but
unfortunately I failed to write it down and forgot. I believe it was around
160 or 165 on the oil temp. Outside air temp was 75 degrees.
---
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