So the break in went well or not?
02-09-2009, 12:47 AM
#1
Senior Member
Thread Starter
So the break in went well or not?
Hello,
The motor is OS 91 FX, Fuel with castor oil 20%.
Started it opened full throttle and opened the needle valve to max to the point the motor doesn’t shot off.
It was running and spitting a lot of oil from the muffler closed the needle valve several times so it got to higher RPM.
What is bothering me is that it was not smooth at all and I run 5 tanks like this, then adjusted the low end screw on the carb closing about 1 turn in total doing it gradually using another two fuel tanks for this process.
Now the motor is running smooth.
So I did this break in with a non smooth engine, is it bad?
Thanks
Alex
The motor is OS 91 FX, Fuel with castor oil 20%.
Started it opened full throttle and opened the needle valve to max to the point the motor doesn’t shot off.
It was running and spitting a lot of oil from the muffler closed the needle valve several times so it got to higher RPM.
What is bothering me is that it was not smooth at all and I run 5 tanks like this, then adjusted the low end screw on the carb closing about 1 turn in total doing it gradually using another two fuel tanks for this process.
Now the motor is running smooth.
So I did this break in with a non smooth engine, is it bad?
Thanks
Alex
02-09-2009, 02:13 AM
#2
Senior Member
Thread Starter
RE: So the break in went well or not?
Let me ask it this way how bad is it if the break in went when the low end mixture valve was not adjusted and the engine was not running smooth
and adjusted later?
and adjusted later?
02-09-2009, 04:03 AM
#3
Senior Member
RE: So the break in went well or not?
Sounds fine to me, the engine will never run smooth during slobbery rich break-in anyway, so don`t be bothered with that. It is normal to adjust the low end needle only after the break in is completed, just like you have done
Now go and fly that engine
Now go and fly that engine
02-09-2009, 08:32 AM
#5
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RE: So the break in went well or not?
ORIGINAL: alex7403
Let me ask it this way how bad is it if the break in went when the low end mixture valve was not adjusted and the engine was not running smooth
and adjusted later?
Let me ask it this way how bad is it if the break in went when the low end mixture valve was not adjusted and the engine was not running smooth
and adjusted later?
Bill
02-09-2009, 11:29 AM
#6
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RE: So the break in went well or not?
Hi!
Isn't the OS .91FX an ABC engine (ABN)!?
Running it slobbering rich isn't right! ABN and ABC engines should always be run at near max rpm or there about.
Slobbering rich is for ringed engines!
Isn't the OS .91FX an ABC engine (ABN)!?
Running it slobbering rich isn't right! ABN and ABC engines should always be run at near max rpm or there about.
Slobbering rich is for ringed engines!
02-09-2009, 11:58 AM
#7
Senior Member
My Feedback: (14)
RE: So the break in went well or not?
ORIGINAL: alex7403
Let me ask it this way how bad is it if the break in went when the low end mixture valve was not adjusted and the engine was not running smooth
and adjusted later?
Let me ask it this way how bad is it if the break in went when the low end mixture valve was not adjusted and the engine was not running smooth
and adjusted later?
With the majority of glow engines, you cannot damage the engine regardless of where the low speed needle is set. It just won't run properly. There used to be some engines in the past (Fox) that could be damaged by running too lean of a low speed mixture. I am not aware of any engine produced today that works the same way as the Fox.
Running a ringed engine very rich through the break-in period is almost always the proper thing to do. They will vibrate, miss and jump around some if your engine mount or model isn't all that solid. That is normal.
Be sure to check all of the fasteners for tightness. In fact, this is a good thing to do several times a year anyway, assuming that you are flying this engine regularly.
Congratulations! It sounds as though you got through the break-in period successfully. I hope you get many, many enjoyable flights with your top notch OS engine.
Ed Cregger
02-09-2009, 12:01 PM
#8
Senior Member
My Feedback: (14)
RE: So the break in went well or not?
True, Jaka, but with the ABL set up used by OS, I doubt if it hurt anything to run it rich. I was wondering the same thing - ringed or non ringed? Still, it sounds as though he got through it fine.
Ed Cregger
Ed Cregger
02-09-2009, 12:04 PM
#9
Senior Member
Thread Starter
RE: So the break in went well or not?
Thanks guys, it was vibrating so much i thought its gonna brake the mount...
the OS 91 FX has a ring.
ORIGINAL: jaka
Slobbering rich is for ringed engines!
Slobbering rich is for ringed engines!
03-13-2019, 03:03 PM
#14
You wouldn't have hurt it any run rich. To fully break it in you several more tanks to go at closer to a normal needle setting. I have always run 3 to 4 tank full at a rich setting on glow engines on the ground. Then fly to finsh the break in.
03-14-2019, 09:36 AM
#17
My Feedback: (1)
the problems I have with the site is that sometimes it will not submit all that I have typed out, the last time this happened to me I found that it has something to do with using "(", ")" and "",, but I am not sure just what the problem is
Jim
