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Old 09-22-2007, 12:23 PM   #1
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hanger 9 twist 40/ lean running engine

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I recently purchased a Twist 40 and installed a slightly used Evolution 46nt. I was having problems with the Evo. running lean, but I continued to fly it and make adjustments as I went. I finally pulled out the Evo. and installed a GMS 47 that I had been using in my LT 40. This engine also ran lean in the Twist. It was a perfect running engine in the trainer plane so that ruled out the engine being the problem. Also the Evo. ran perfect when installed in the LT 40. I checked fuel tank height and found it was 3/4" below the carburator spray bar - which is too low, so I elongated the access hole in the firewall and raised the tank as much as possible. End result was 3/8" below the spray bar. I also shortened the carb. supply fuel line to eliminate any high spots. I then installed a stock Evo. muffler with baffle on the GMS for some extra tank pressure and then went for a fly. The engine ran perfectly with no lean condition at all, but with the restrictive muffler on it I had lost over 1000 r.p.m. NOT HAPPY! I reinstalled the stock GMS muffler and picked up the r.p.m. but also had to richen the carb by 1.5 turns. End result is a smooth runing engine on a nice airplane. This is the first ime I have run across this, as this is my first ARF and all of my kit planes have worked perfectly.
Just thought I would share this in case anyone else was having similar problems.
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Last edited by thuebner; 11-11-2009 at 03:35 PM.
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Old 10-01-2007, 04:42 PM   #2
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Interesting...I was experiencing leaning out yesterday when at full throttle on a ST G-51 (RPM was changing to peak after being on full throttle for a couple of seconds) which ran perfectly fine in my H9 P-51. I do have a pretty long supply line which could be shortened somewhat..But I am dreading having to re-position the tank but I think I will try to shorten the supply line first to see if that remedies the problem.
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Old 10-02-2007, 06:34 PM   #3
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Twist 40

Since I made the post I have flown the Twist several times with the GMS and stock muffler. Nose high position is still giving me some grief. In level position and carb set a few clicks rich of peak r.p.m. , which is how I set all my engines, the engine will surge (lean) in a vertical climb or hover. I have had to set the carb on the rich side in horisontal position with a noticable drop in r.p.m. but the payoff is the engine picks up r.p.m. and runs consistant and strong in a nose high attitude. So far I have been living with this set up since I mostly fly the Twist in nose high Positions. I will experiment more once I have more time. Winter is coming and flying time is limited so I don't want to waste my time tuning in the engine.
This is not a fault of the engine as I know it runs beutifully in other planes. My guess the tank is still too low at 3/8" below spray bar. I will likely have to install a baffle in my muffler to increase tank pressure or live with it the way it is.
Phobix, make a post when you try a different combination. Would be nice to figure this thing out.

Good luck

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Old 10-17-2007, 01:28 PM   #4
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I wonder if this is the cause of my problem also. It seems every time the Twist goes up 6 or 7 minutes into the flight the engine will quit. It doesn't matter what is being done with the plane either. Slow flight or fast etc.
I know the exhaust gasket leaking would have something to do with it also but I don't think it was leaking on all the flights of the plane.
Of course now the weather is not cooperating to take it up with the new gasket in place to see if that remedied the problem.

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