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HomeAircraftHelicopterHelicopter Main Discussion › Engine breakin
02-04-2013 01:45 AM  5 years agoPost 21
helixangle

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Mamaroneck, NY - USA

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Um... Two stoke burns fuel not oil look add a spent sleave and look at a new sleeve this should answer your questions about this matter

Still no one can dispute this is wrong, I say again... Myself and many I have helped use this "method" currently have STRONG engines.

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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02-04-2013 07:43 PM  5 years agoPost 22
AKPhill

rrApprentice

Soldotna Alaska United states

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Interesting subject For sure
I have 2 os 50 hypers and the first one I babied along with breakin procedures as was told to me it runs ok
The second one i ran one tank of fuel thru and then I turned on the gov and flew the snot out of it they are both now 3 years old and running perfect cylinders on both look good when changing the bearings
just my observation

AKPhill

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02-04-2013 07:51 PM  5 years agoPost 23
wrongler

rrProfessor

Brewerton, New York

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helixangle....Who the heck is wongler!

Bill Whittaker

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02-04-2013 11:00 PM  5 years agoPost 24
helixangle

rrKey Veteran

Mamaroneck, NY - USA

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Sorry... Still laughing as I was thinking "you dumb dumb"

Then I realized that I was the dumb dumb

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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02-04-2013 11:26 PM  5 years agoPost 25
timmay

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Orange County CA

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I received my OS 55 today..i attached what the manual states..But I'm going to use helixangle's method.

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02-04-2013 11:39 PM  5 years agoPost 26
barely can fly

rrApprentice

oxford ga. usa

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The key phrase in that manual is allowing the parts to mate together under load at operating temperature, no load and or no heat is not good.

ATLRC wrecking crew / NCRC

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02-05-2013 12:11 AM  5 years agoPost 27
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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Why "no gov"?

I agree that engines are pretty much "pre-broken in".
I also agree that a few heat cycles is good for a brand new (out of the box) or newly rebuilt engine.

But, why no gov?

I have always used a gov on a new or newly broken in engine.

I am careful with the initial spool up - I think this is where a lot of mistakes happen. If the gov engages and the engine is set too lean, you are in trouble.

I also set the head speed (thereby engine speed) to 100 or 200 RPM lower than "normal" on the "Norm" flight mode. I also set "FS1" mode to 100 RPM higher than "Norm". Then switch back and forth during the first two or three flights.
I do the first flight 90% Norm, and maybe 10% FS1.
Then 50/50 after the 3rd flight.
Then 10%/90% from then on.

Of course the needles are extra rich (maybe 3/4 to 1 full turn open more than the manual suggests) and I will open them even more if I don't like the sound. I'll wait until the 3 or 4th flight to start to lean it down - but by then, I've found the "rich" balance between the high, med and idle needles. As I lean, I balance across all needles (1 click high + 2 clicks mid).

But, the key with the gov is that it will constantly vary the throttle as the load on the engine dictates - and you get more heat cycling during the flight.

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02-05-2013 08:05 AM  5 years agoPost 28
thorpdrvr

rrApprentice

san antonio, tx

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My take on break in (what they do in full scale $30,000 plus aircraft engines)is to run it pretty hard. As long as you don't run it hot, running hard is only better as it creates more outward pressure on the ring and that helps the peaks on the cylinder wall to wear quickly and properly. The reason you need to run a little richer is to prevent overheating as there is more friction as the peaks wear down. Too hot and it can glaze the cylinder or seize. Too cool or running at low power and the wear doesn't take place properly. If it doesn't wear in properly within a few flights only remedy is to rehone and replace ring and do it the right way. As friction lessens, you need to lean each flight (or couple flights as needed)until temp stops dropping or it will run too cool.

On full scale they want virtually no idle. Just leak check and don't run below 75% power for about 10 hours. These are four stroke engines but about the same applies to two stroke.

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