Breaking in OS46AX - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-11-2011, 08:24 PM   #11
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Re: Breaking in OS46AX

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like ron said just put it one the plane run a tank through it and go flying
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Old 05-11-2011, 10:10 PM   #12
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Re: Breaking in OS46AX

hello fellas,

an interesting topic from our friend & even more interesting replies.

I'll tell you guys how i do it & you can tell me im nuts if you feel like it .

from many decades ago people were of the belief that an engine should be broken in for several tanks of bench running @ a slobering rich setting, i used to use this method until..... i bought ABC piston & cylinders from performance specialties & followed their break in instructions, basically put some oil in the cyl. bolt the head down & turn it over by hand i beleive 50 turns or so remove the head clean off the oil reinstall everything & start the engine close the needle until it screams & then open it approx 2 clicks to prevent any lean runs & go fly it @ various throttle settings, using a slightly smaller prop than you normally use for a specific engine & the same fuel & nitro you intend to use . the idea is to get the engine @ operating temp. to provide proper tolerances betweeen piston & cyl. taper.

have you guys noticed how the needle settings sometimes need to be reset when running new engines ?

have you also looked @ the color of the oil coming out the exhaust ?
on a new ABC engine it will be black when running in omega fuels (castor oil advantage) & it turns dark brown when broken in.

on ringed engines i just run them without the initial hand turning procedure & only slightly richer than above. its hard to get a helicopter airborne if the engine isnt giving its power!

I cant wait to hear what you guys say about this , & no I will not guarantee your engine!

& BTW my favorite model powerplant is a 2 stroke with tuned pipe & fuel pump.

have fun guys.
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Old 05-11-2011, 11:19 PM   #13
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Re: Breaking in OS46AX

Thank you for the very interesting and knowledgeble replies.

The reason for being reluctant to apply full trottle to a new engine is somehow related to the fact that 2 weeks ago I ruined a brand new Leo 46 ABC engine while breaking in, following the manufacturers instructions:

I had a little problem with that engine prior to break in, but I guarantee nothing was damaged: crank, piston, connecting rod...all was perfect.

Here are the manufacturers instructions for break in the LEO 46:
- close needle valve then open 1 1/2 - 2 turns
- start the engine and with the throttle fully open, gradualy close the needle valve until it is running at its maximum speed
- set the main needle valve very very slightly to the reach side of the peak RPM setting
- make sure the engine is fully broken in (about 1 hr of total running time in short runs) before oprating it continously.

I followed the above instructions, and at the end of the tank...the connecting rod broke.

The big difference I can see now is the OS recommend to run very reach as opposed to LEO which is recommending to run it only slightly reach. Actually LEO manual is mentioning: DO NOT break in by running it slobbering reach.
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Old 05-11-2011, 11:28 PM   #14
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Re: Breaking in OS46AX

Slobbering rich is no good either.They need heat for an optimum break in.Ramz's description is quite good

Just turn it out an extra half turn and run it a varying speeds for a tank if that makes you feel better.Tune from there and go fly.Its all i have ever done..
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Old 05-12-2011, 07:30 AM   #15
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Re: Breaking in OS46AX

I have always broke in my ABC/ABN engines by running rich for 5 minutes, then shut it off and let it cool, then start, run full throttle and lean a click or two, run 5 more minutes, shut off let cool again, start, run full throttle again lean a click or two and run 5 more minutes. After this process is done, I just finish breaking the engine in flight by richening it out from peak RPM by 200-300rpm below peak and flying it alternating full throttle for a couple minutes and then half throttle for a couple for the next tank.

Everyone does it slightly differant, but this has worked well for all my ABN/ABC2 poppers

Good luck

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