OS 46LA engine stops when throttle is fully open

by Vivek
(INDIA)

I have OS 46LA engine. Fuel mixing : 75% mythenol,20% oil, 5% Nitro.

I have new OS 46LA engine and I need to break in and set the high speed needle at good position.
But when I try to start the engine Initially engine starts at low RPM with 1 and 1/2 high speed needle vale is opened and 1/3 throttle is opened.

Then gradually starts opening the throttle. Engine RPM is Increased up to 85% throttle open but after that around 90-95% throttle open the engine stops.

So i never get a chance to start the engine and run with fully open throttle and then set the high speed needle vale. Please provide me some your experience to solve my problem,

Yet I have not burn a single fuel tank.
I really appreciate your Help,

Thanks,
Vivek

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OS 46LA engine stops when throttle is fully open

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Dec 14, 2009
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Engine Works Fine
by: Vivek

Hi Matt,
Yes! i follow Michael's instruction and engine works fine.

Actually Yet I have not get a chance to fly my 1st air craft due to bad weather. I start the engine with 3 turns open on the high speed needle. After that throttle is fully open and close the high speed needle about 1/2 turn. So it is not too lean.

I measure the RPM and Lowest RPM i can achieved is about 4000 and Max is 9800. I can increase but engine is very new so i do not want to run it on high RPM. So i think this setting should work well.

One thing i am wondering that according to the Company manual of OS 46LA engine, the practical RPM are 2000 to 15000. So how can i get this range, more prissily the lower range like 2000 RPM.

Should i increase the Nitro instead of 5% to 10% ?

I really welcome your suggestions and experience tips!

Thanks,
Vivek

Dec 13, 2009
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Have you tired Michael 's advice?
by: Matt

Hi Vivek,

I think Michael's advice above is just about a straight as an answer as you're going to get.

Are you still having problems after trying the advice he has given? If so, more specifics of how your engine is behaving will help to answer you better.

Dec 13, 2009
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os91
by: Anonymous

hi mattt.i have a problem.when i throttle up my os91fx it quits.when i leaned a bit the low speed and i opened the high spedd i worked much better.i would like some straight forward answers because i hear a lot of solutions....please....

Dec 03, 2009
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Thank Michael
by: Matt

Hi Vivek,

I am glad you got your engine running properly!

However, you should thank Michael for the assistance, not me!

Happy flying!

Matt

Dec 03, 2009
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It works!
by: Anonymous

Hey Matt,
Thanks much for your comments.
It really works. It was happing as information you were provided me.
Now i can start my engine at high speed needle open about 2 and 1/2 turn open and it runs at low RPM and it will not stop when throttle is fully open. I burn 2-3 tanks at this rich settings. So now i can gradually close the high speed needle for subsequent flight but I will take care as you told me about lean settings.

Thanks,
Vivek

Dec 02, 2009
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Too Lean.
by: Michael from Oz

G'day. One and a half turns open on the high speed needle is probably too lean. I would start with the needle about three turns open. This should allow the engine to run quite rich at full throttle. Run a part of a tank through it then pinch the fuel line closed. (When it is running rich, you may need to leave the glow driver connected. This will not cause problems so long as it is running rich.) When you pinch and hold the tube, the engine should speed up (run leaner) so once it does, release the tube and let the engine go back to running rich. This is an easy way to give the engine a range of running conditions - rich and lean.

After a couple of tanks like this you can lean the high speed needle to the point where the engine just starts to run at a two stroke. Like this it is slightly rich and you can fly it like this for several tanks and then slightly lean it for more power. Never fly it absolutely at its peak - always richen it about a quarter of a turn and it will last forever.

Mike