New ring - How much running in?
04-08-2008, 07:01 AM
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New ring - How much running in?
I've just replaced the ring in my GMS .61. I want to know how much running in it needs before I can fly it. I've run about 16 oz (0% FAI fuel) so far, mostly at low to medium speeds, with the odd quick burst to WOT - all very rich. I stopped it every few minutes and let it cool before restarting and carrying on.
How do I know when it has bedded in?
Can I damage it by running it too fast too soon?
How do I know when it has bedded in?
Can I damage it by running it too fast too soon?
04-08-2008, 10:58 AM
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RE: New ring - How much running in?
No it wont damage it.
Break it in like a new engine. 2 tanks on the ground, 2 tanks in the air - rich mixture. that should be more than enough.
Break it in like a new engine. 2 tanks on the ground, 2 tanks in the air - rich mixture. that should be more than enough.
04-08-2008, 11:01 AM
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RE: New ring - How much running in?
I usually don't break my motors on a test stand.When the motors are new I usually adjust the low end so it idles smoothly this may take ten minutes of playing with the low end.Once I have done that I adjust the High end and then set it just a little rich for the first few flights after that I reset the high end again and 99% of the time I dont ever have to mess with the carb settings. I fly all four strokes.To answer your question I would do the same as mentioned above.One thing that I forgot to mention I that I usually vary the engine speed while flying the first few times. Hope that helps.
04-08-2008, 11:03 AM
#4
RE: New ring - How much running in?
....hopefully, you de-glazed the cylinder wall and honed/prepared the
surface for a new ring. If you did it properly, the ring will seat in a few
minutes. Running it too rich will impede the break-in process. You must
get the engine hot, and run it with high cylinder pressure to help seat
the new ring.
Don't baby the engine, run it full blast and at a full two cycle, peaking the
engine with the main needle to full RPM for 20 second bursts, then open
the needle till the engine slows down some, for a 20 second cool down,
then back to peak....all done at full throttle.
Alow a 30 second warm up at 1/2 throttle before you start this procedure.
Time 5 minutes running for a session. 3 or 4 sessions and your ring is broken
in....15 to 20 minutes running is all you need.
At the end of each session open the needle till the engine begines four-stroking.
Let it run like that for 20 seconds to cool off the engine. There is no reason to
run it sloppy rich, all you will do is waste fuel. Start the engine back up at this rich
setting and go back to full RPM after the 30 second warm-up.
FBD.
surface for a new ring. If you did it properly, the ring will seat in a few
minutes. Running it too rich will impede the break-in process. You must
get the engine hot, and run it with high cylinder pressure to help seat
the new ring.
Don't baby the engine, run it full blast and at a full two cycle, peaking the
engine with the main needle to full RPM for 20 second bursts, then open
the needle till the engine slows down some, for a 20 second cool down,
then back to peak....all done at full throttle.
Alow a 30 second warm up at 1/2 throttle before you start this procedure.
Time 5 minutes running for a session. 3 or 4 sessions and your ring is broken
in....15 to 20 minutes running is all you need.
At the end of each session open the needle till the engine begines four-stroking.
Let it run like that for 20 seconds to cool off the engine. There is no reason to
run it sloppy rich, all you will do is waste fuel. Start the engine back up at this rich
setting and go back to full RPM after the 30 second warm-up.
FBD.
