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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › running in OS-50 - how long?
05-18-2007 10:30 PM  13 years ago
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carpetman

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Bradford, England

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running in OS-50 - how long?
Hi there.

I'm new to heli's and was wanting to know how long it takes to 'run in' an OS 50 engine. It was set up by the shop slightly rich and it started to bog down after about 3 tanks so I turned the needle down 2 notches clockwise. I've now done about 6 tanks. Do i need to turn it down much more in you opinions???

How lean shoud I go?

It seems to take a while to wind up the head speed but im not sure if this is normal.
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05-18-2007 10:32 PM  13 years ago
SteveH

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Texas

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After 6 tanks, I'd lean it till the backplate is warm to the touch, and fly it.The government cannot give you anything without first taking it from someone else.
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05-19-2007 12:55 AM  13 years ago
pcliftonjr

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Phoenix, AZ

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I run mine very rich for a gallon...then I start leaning.

Paul
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05-19-2007 09:21 AM  13 years ago
Jafa

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Sydney, Australia

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I'm sure I've read some OS documentation that said the engine is manufactured with close tollarences and quality control, as such the engine does not need an extended run in

I only do three normal mode flights to bed the ring in and then move into full idle up...

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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05-19-2007 08:42 PM  13 years ago
grock

rrApprentice

Israel

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Can someone explain me what it means to lean the engine and basically how to break-in OS50 Hyper ?... I ran 6 tanks very rich.. 2 1/2 turns.. what should I do next ?
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05-19-2007 08:44 PM  13 years ago
Gearhead

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Vt

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I agree with Steve, 6 or 7 rich flights then slowly lean her out a click or 2 every tank,, besides, no need wasting your time, you may be tearing her down anyway in 2.5 gallons to replace the rear bearing,,

to properly brake-in the OS 50 you would have to run it rich for at least 3 gallons, how I know ? cause when my rear bearing went bad in 2.6 gallons I found the ring was still black,,

as I found out running your motor rich is not a guarantee that your bearing will last,, if you knew 100% for sure that your rear bearing was going to last 50 gallons (as some do) "as my friend has over 50 gallons on his" then I would tell you to take your time and use 4 gallons to brake-in your motor properly..

Jim
Jim
Buzz Buzz Buzz
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05-19-2007 08:51 PM  13 years ago
Gearhead

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Vt

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lean= you turn the needle in (in), to restrict the fuel flow,,

"" what should I do next ?"" lean your motor 2 clicks on it's next flight, then 2 more clicks on it's flight after that,,

depending on what muffler you have your high needle should be somewhere around 1&1/2 open for full power yet remaining rich,, some tuned mufflers/pipes run your needle leaner,,

remember you need to run your motor rich to help cool the piston, so never lean it to much, experience will teach you the limit you can lean your motor, or have an experience pilot fly and tune it for you..

Jim
Jim
Buzz Buzz Buzz
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05-19-2007 09:05 PM  13 years ago
grock

rrApprentice

Israel

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Thanks, I'll do that. Should I see smoke after I'm leaning the needle ? right now when I run it rich, I have a good smoke trail.. some people at the field told me it's great.. and that I should run it at least 2 gallons..
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05-19-2007 09:14 PM  13 years ago
Gearhead

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Vt

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if your not flying crazy yet then don't worry about having to have every last bit of power out of your motor, take your time braking it in, who knows, your rear bearin may last longer than 2 or 3 gallons..

Jim
Jim
Buzz Buzz Buzz
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05-20-2007 12:02 AM  13 years ago
BarracudaHockey

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Jacksonville FL

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Running it any richer than slightly warm on the back plate is a waste of fuel, these engines have to heat up to break in. Not saying to lean it till it blows up but raw fuel running out of the tail pipe does nothing to contribute to seating the ring.Andy
AMA 77227
http://www.jaxrc.com
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05-20-2007 12:28 AM  13 years ago
airdodger

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Johnston USA

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If you don't get the engine up to operating temperature in a short time it will never break in properly. The engine ring seats very fast, probably in one or two tanks. A few clicks on the rich side is all you need, and you should always be a few clicks rich. ChrisChris
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › running in OS-50 - how long?
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