stunthanger.com
Engine basics => Engine set up tips => Topic started by: peterrdawson on October 27, 2013, 09:45:05 AM
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Has anybody used the Evo 40 nx for stunt?
Is it worth blocking the boost port before running in a plane ?
Any advice or hints would be appreciated.
Peter
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I can't comment on this engine but when they developed the Evolution 36 and 60 they had to make new liner for them to change the timing. The Evo 40 NX weighs about 10 oz without muffler and for some models it is a deal breaker.
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Thanks Dennis,
I have the Evo 36 and like the run characteristics, and was thinking of getting another only to be told that they are now no longer available in the UK. Thinking no matter with the help of the all powerful internet I can get one from Horizon in the USA. So clicking all the buttons everything was going well until the cost of delivery- $58. this seemed a bit much for an $80 item.
Looking round in the UK the Evo 40 nx is available in radio form and I could turn up a venturi, and the mounting dimensions are the same as the 36.
Hence the question has anybody run one as a stunt motor, and if so are any modifications required.
Peter
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Thanks Dennis,
I have the Evo 36 and like the run characteristics, and was thinking of getting another only to be told that they are now no longer available in the UK. Thinking no matter with the help of the all powerful internet I can get one from Horizon in the USA. So clicking all the buttons everything was going well until the cost of delivery- $58. this seemed a bit much for an $80 item.
Looking round in the UK the Evo 40 nx is available in radio form and I could turn up a venturi, and the mounting dimensions are the same as the 36.
Hence the question has anybody run one as a stunt motor, and if so are any modifications required.
Peter
Peter,
The engine is easily convertible. we get our venturis from Lee Machine shop and needle valve assemblies from Randy Smith at aero products. The cinch bolt hole is larger than usual so your spraybar needs a sleeve that if you get you venturis from Jim Lee it is included. This conversion makes the engine easy to needle and the runs are excellent. You also can get your tank and nva on the same level.
A few pictures are included
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I'm wondering if they have discontinued it in the UK weather they have discontinued production and we will be out in the cold when Horizon runs out of stock. Of course if they are like the evil empire they won't let you know until it is too late.
Dennis
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I converted an rc evo36 to cl with a simple venturi and needle valve, and then later got the cl version. I liked how my Rc conversion ran better than the CL version.
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Mike , thanks for that, I have had success fitting venturis to r/c engines for c/l use. Some experimentation with size is required,and you only know what size to make the diameter when you have made it too big.
Peter
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The .40 NX that I examined had much higher timing (exhaust and Bypass) than the 36 and would be tough to tame for stunt IMHO.
The ASP 36 is available from the link below. (they are in the U.K.) I have used these for stunt and sport flying. They are exactly the same as the Magnum sold by Hobby people. These engines have essentially the same timing as the Evo 36 and internal parts like bearings are interchangeable.
The ASP mounting bolt pattern is identical to the Evo and the weight is actually about 10 grams lighter.
I run mine on 5-10% nitro/22% oil (50/50) and use venturi's from .250" to .265" with a PA or ST NV assy
(.157" dia.). Depending on the weight of the airplane I have added head shims to soften the break. The muffler bolt pattern is the same as OS, Evo, and Magnum so you can use those also.
You can even order the engine in CL version from them if you want.
Hope that helps you out H^^
http://www.justengines.co.uk/acatalog/ASP.html
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Thanks for the timing info on the 40nx, then it would seem to be the wrong engine for use in an aerobatic model.
I will have to have a look at the ASP 36. Thanks.
Peter