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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › ideal temp for the OS 61 sf
09-06-2006 03:16 AM  14 years ago
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loveingit

rrNovice

Houma LA

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ideal temp for the OS 61 sf
I am new to tuning . so I got an on board temp gage what do you think is the ideal temp for the OS 61 sf without running it lean?
Thanks
Windy days really blows!
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09-06-2006 04:02 AM  14 years ago
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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I've Never Temped An Engine In My Life Yet!!
If you are running an os 61sf/sfwc or any engine for that matter the lowend needle on the 3 setting carb is the slotted srewdriver slot and it will be about 1 1/2 turns counterclockwise from the fully closed position. The midrange on these motors isn't too sensitive and I've run the midrange needle 2-4 turns out whichever suits how you want the engine to be in the hover. And the high end will be between 1 3/4 to 1 1/2 usually halfway between these 2 settings and that motor on 30% and a Hatori muffler will run perfectly and strong give or take 2-3 clicks on the high end needle depending on weather. I live low near sea level and flying for near 16 yrs helis and never have I touched or temped one yet. It's start slightly rich on all settings and LISTEN to the motor and look at the exhaust smoke in hover and fast foreward flight. Does it hang and not drop to idle INSTANTLY when you go to idle with the throttle stick or throttle hold then you are too lean if it stalls then you are too rich. Does it spit and sputter upon advancing the throttle then too rich if starts screaming and revving too fast then it's too lean. When hovering does it have one SMOOOOOOTH sound or is it raspy sounding with hardly any smoke it's too LEAN, if it's gugurling and lots of smoke and not revving then too RICH. The fuel tank will be still and fairly motionless with no roiling and bubbles and the motor will be close to being spot on. Look at exhaust smoke, Listen to engine sound, and Look at fuel tank , then climbout and look and listen and cut throttle and look and listen. You will KNOW when you are tuned right. Everyone I fly with or around never has used a temp gun nor touched an engine to tune it. YOU will develop an ear for it after a couple of times.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!
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09-06-2006 12:21 PM  14 years ago
loveingit

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Houma LA

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I have got to the point where it is running great. Good snappy response, no bogging down, or cutting out. The temp is about 250f . I just don't want to be to lean and shorting the life of the engine. Gftazz thank for the info. I did not know about the fuel tank and bubbles. at one time or another I did have bubbles in the tank. Knowing the temp will give me piece of mind seeing how I am new to tuning. At one point I did have the temp at 230F ran good not as snappy. Did do the water test on the head boiled off in about two or three seconds. The more info I have the better I will feel about knowing if I have it right.Windy days really blows!
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › ideal temp for the OS 61 sf
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