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Old Feb 04, 2007, 10:30 PM
Sayonara
JEB21's Avatar
Agoura Hills,CA
Joined Mar 2004
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Discussion
OS vs. Evolution

Getting back into glow after a long hiatus from fuel and I've decided on a plane but I need a powerplant. What is the public consensus as far as OS engines vs. the Evolution? The engines in question are:

OS .55 AX

or

Evolution .52 NX

We're talking about an insignificant extra 12 bucks for the OS...is it the better choice
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Old Feb 05, 2007, 06:04 AM
WCB
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OS puts out a little more power than Evo.
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Old Feb 05, 2007, 07:43 AM
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celery's Avatar
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But what is the weight difference?
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Old Feb 05, 2007, 02:53 PM
WCB
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OS 55 AX= 14.25oz. $149.99
Evo 52= 14.5oz. (weight w/o muffler) $129.99
At $20 more I'd buy the OS
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Old Feb 05, 2007, 03:02 PM
Just Plane Going To Heli
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Leipsic, OH
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One consideration is the break in period. Evolutions don't need one. Just start it, fine tune it, and fly.
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Old Feb 05, 2007, 03:39 PM
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White Bear Lake, MN
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The Evo. 46NT is only $89.99.
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Old Feb 05, 2007, 07:39 PM
WCB
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By the time it takes to remove the needle valve limiter on the Evo(which I highly recommend you do) you could have your OS broke in.

*As a side note....they say Evo's are broken in at the factory but that is not the case. I've owned 3 (.36, .46 and .61) and seen a bunch and none were completely broken in when new.
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Old Feb 05, 2007, 07:51 PM
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I personally think Evolution engines are giving OS a run for the money ....and the winner is: THE MODELER...both are great running engines!
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Old Feb 05, 2007, 09:07 PM
Sayonara
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Agoura Hills,CA
Joined Mar 2004
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I've seen great write ups on both and the consensus seems to say OS has the better power output. I'll probaly go with the OS, they've got a long proven track record.

"funtanas" I'm wanting a bit more power than the .46 thats why I'm going with one of the 50's. Same size as a 40 but with more brute force!
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Old Feb 06, 2007, 09:53 PM
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Go For The Os Os Os Os You Will Never Have The Problems That Follow Evo. Oh They Run Good For A While Then Like Magic Problems Occur. That Won,t Happen With The Os Os Os Os Os Here Me Now Believe Me Later!
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Old Feb 06, 2007, 11:30 PM
Sayonara
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Agoura Hills,CA
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Bought the OS .55 AX today. Looking forward to seeing the performance soon!
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Old Feb 07, 2007, 11:54 AM
I'll try anything once!
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Huron, South Dakota
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As an OS and an Evolution user I am on the fence about this one. All of my Evo .46's have run like a drem, while my OS AX .46's are 50/50. I have one AX on a trainer for my son that is nothing but rock solid, yet I cannot get the .46 AX on my Slow poke to not bog down when going from mid throttle to high throttle while airborn. My Evo 1.00's are great engines and have run much better than my OS .91. My Evo .40 is great, but so is my OS .40 LA (which is alot less powerful due to the design of the engine). I guess what I am saying is that you can have trouble with any engine, or have success with any engine, regardless of the brand name stamped on it. I have yet to have issues with the Evolution engine though, and will probably purchase them over the OS just because of the lower cost. Now, I just wish Evolution made a 1.60 sized glow engine...
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Old Feb 07, 2007, 07:46 PM
Canucklehead
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GTA, Ontario, Canada
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Quote:
Originally Posted by WCB
*As a side note....they say Evo's are broken in at the factory but that is not the case. I've owned 3 (.36, .46 and .61) and seen a bunch and none were completely broken in when new.
I agree. My 46NT was so tight, it was actually squeaking on startup for the first couple of tanks.

I'd have to say that both OS and Evolution are both excellent engines in their own right. Evolution engines are very user friendly. Both are smooth running, reliable, and easy to start. You can't go wrong with either.
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Old Feb 07, 2007, 08:57 PM
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My engine supplier recently informed me that the OS 50 has been withdrawn owing to piston problems, (not specified) guess I will stick with my three 46; one of which been running for nearly five years now and still a good engine.
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Old Feb 07, 2007, 10:25 PM
Sayonara
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Agoura Hills,CA
Joined Mar 2004
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Quote:
Originally Posted by macboffin
My engine supplier recently informed me that the OS 50 has been withdrawn owing to piston problems, (not specified) guess I will stick with my three 46; one of which been running for nearly five years now and still a good engine.
My local hobby store told me the same thing about the now defunct 50. They also mentioned that the .46 may be phased out in the near future with the 55AX being the replacement???

It was a few extra bucks going with the .55 over the .46 so I hope the decision was the right one.
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