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Break-in on the ground or in the air? - 4/10/2012 10:06 PM   
flymeaway


 

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From: howell, MI, USA
Status: offline 		I'm finishing up my winter build and haven't decided if I want to bench run the engine for a few tanks or simply bolt it on and go fly. The engine is a Brillelli 36GT, never run before. I'm not in a hurry to get this engine broke in and can live with reduced power and running a bit rich for a few gallons so I see no reason not to.

Last year I bought a BME 58 Extreme and was told by the owner not to bench run it but rather just throw it in the plane and go fly, which I did. Problem is I only have one flight on it so I have no evidence if it makes a big difference or not.

So what do you do?

Thanks



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RE: Break-in on the ground or in the air? - 4/10/2012 10:15 PM   
krayzc-RCU



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RE: Break-in on the ground or in the air? - 4/10/2012 10:20 PM   
w8ye



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Status: offline 		Make sure the engine runs OK on the bench and then put it in the air.


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RE: Break-in on the ground or in the air? - 4/10/2012 10:24 PM   
Truckracer


 

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Status: offline 		Use the gas / oil mix you intend to use long term ... I prefer something in the 32:1 range. Set the needles for normal running .... not rich like you would a glo engine. Make sure the engine is reliable on the ground and go fly. Don't beat the crap out of the engine for a few gallons and thats it. You don't have to baby it but certainly don't abuse it! Enjoy!

Of course make sure the engine is properly cooled in the plane with proper air inlets, outlets and ducting / baffling as needed.

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RE: Break-in on the ground or in the air? - 4/10/2012 10:26 PM   
ggraham500



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RE: Break-in on the ground or in the air? - 4/10/2012 10:52 PM   
ahicks


 

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Status: offline 		If it's in the air, I say go ahead and beat on it - but just for a second or 2? Then cool it down with something closer to half throttle or less for a minute.

I'd also suggest fly it the first couple of flights without the cowl - but I won't argue that point.

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RE: Break-in on the ground or in the air? - 4/10/2012 11:19 PM   
RTK



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RE: Break-in on the ground or in the air? - 4/10/2012 11:26 PM   
TimBle


 

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Status: offline 		another vote for air.

run engine for a few minutes to get the low and high speed needles set for reliability. Then go fly.


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RE: Break-in on the ground or in the air? - 4/11/2012 5:05 AM   
kmeyers


 

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Status: offline 		Is this a poll?

Air! After needle adustments mounted in plane. Oil, what you are going to run for the life of the engine.

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RE: Break-in on the ground or in the air? - 4/11/2012 8:05 PM   
captinjohn


 

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RE: Break-in on the ground or in the air? - 4/11/2012 9:26 PM   
dirtybird


 

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Status: offline 		There have been few engines I didn't like.
The first one was a GHQ. I never did get it to run.
Next was a Rogers 29 with its wipe timer. It ran for about two hours then it was worn out.
And then there was the Pacemaker 59. Beautiful advertisement and it appeared to be well made. I couldn't get it to run for more than a few pops. I sent it back to the factory and they returned it without comment. I finally beat it to death with a hammer.

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RE: Break-in on the ground or in the air? - 4/11/2012 10:01 PM   
earlwb


 

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Status: offline 		I always test run a  engine for a while on the ground in a test bench setup. I then move the engine to the plane and finish the break in on the plane in the air. Many of my engine really require a break in and some are long wearing and it takes a longer time. So flying them makes more sense that running through a couple three gallons of fuel in a test bench.



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RE: Break-in on the ground or in the air? - 4/11/2012 11:01 PM   
Jezmo



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RE: Break-in on the ground or in the air? - 4/12/2012 3:36 AM   
bcchi


 

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Status: offline 		You never tried a Thor-B or a Genie,my first good engine was a OR 23.O how about a Deezil-A.
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RE: Break-in on the ground or in the air? - 4/12/2012 5:44 AM   
dirtybird


 

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Status: offline 		My first successful engine was Phantom P-30. But I cranked on that engine for a year before I discovered you needed two batteries on the ignition instead of just one.
Next I got a Brown Jr and that set the standard.
I had three Orwicks at one time, one NIB. My mother gave them away to the neighbor kids when I was in college. I wonder how much I could get for them now.
BTW I break my engines in on the ground. I feel I have more control there. Some manufacturers give a specific period you should run it before you fly it.

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RE: Break-in on the ground or in the air? - 4/12/2012 12:57 PM   
BarracudaHockey



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RE: Break-in on the ground or in the air? - 4/12/2012 2:42 PM   
dirtybird


 

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quote:

ORIGINAL: BarracudaHockey

Showing your age


Yep-I can even remember when we used to build the airplanes we flew. My first gas job was a Scientific Mercury. It came with a prop blank and you had to carve the airfoil.

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RE: Break-in on the ground or in the air? - 4/12/2012 5:11 PM   
Rocketman_



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quote:

ORIGINAL: bcchi
... how about a Deezil-A.

Deezil *barf* . I believe mine was well broken in on the bench by the time I decided to quit flipping and flipping and flipping the prop. It never ran.

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RE: Break-in on the ground or in the air? - 4/12/2012 6:19 PM   
airraptor


 

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Status: offline 		I also say the air is best for longevity and best power from the engine over time.

The engine on the ground may or may not have the same or less air flow then when in the plane. also the cooling air flow on the cylinder will be way different when in the plane then will be on the ground. With that the cylinder will have different hot spots. the different hots spots are sections of the cylinder will be hotter ( rear of the cylinder "south if looking from above" ) in the plane. on the ground on a stand the hot section will still be near the rear but more toward the exhaust area ( south east oreintation ). this difference will have the ring break in slightly differently than when mounted in the plane. now this may one be 100-200 rpm difference but over the long run it will be more. Now this may be to deep in thinking than most will bother with. lol most of our planes are way over powered anyway. there is the thinking also that breaking in an engine on a hard mounted engine stand will have a different wear patten than when its in the plane which acts like a soft mount ( IE the plane shaking). There are many theory's on the proper break in of a engine and different directions also for if breaking in for max power or longevity.


Just mount on the plane. leave the cowl off (if there is one) start it up for first time on the ground. While its running for first time do you radio range check and failsafe checks. Then refill the tank start engine and fly.

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All Forums >> Glow Engines, Gas Engines, Fuel &amp; Mfg Support Forums >> Gas Engines >> Break-in on the ground or in the air?
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