Some info and suggestion about Magnum engines - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-20-2013, 04:01 PM   #1
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Some info and suggestion about Magnum engines

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Hi, everybody, welcome there and see this little article. As you know, the Magnum engines are kind of "carzy", I an gonna tell you how to deal with those problems.
maybe you have heard about ASP, and SC, well, in fact ,Magnum ASP and SC belong to a same chinese company. the sale ASP in china, and Magnum in US and CA. as for quality, normally , Magnum is better than ASP.
If you want to buy a OS or saito engine, you probably knew the quality of that type which you want to buy, but for Magnum, you have no idea, there are parts of Magnum engines work well and easy to adjust, and they work as good as OS! but unfortunately ,another part , not so good...maybe easy to extinguish, or maybe no adling. well, you dont know what kind of thing you gonna buy ,take a chance ..
In china, we summary the quality of ASP, and we find that some types of ASP are better than average, Which means you have more chance to buy a good quality ASP(Magnum), and some types are always shows some problems. according to, We found that 2 stroke .46 are the best 2 stroke engine of Magnum, and 4 stroke .61 are the best 4 stroke engine of Magnum. and also , we found that 4 stroke .70 always have some ploblems, only few of owner said their .70 works well.
And, we also found some common problems of Magnum. 1,they are more weight and provide less power as the same size OS. 2,Oil needle are really hard to adjust especially the 2 strokes. 3,less impression , espeaially 4 strokes. and finilly, short life time. well the fact is you can solve problem 1...but as for 2,the best way to solve this problem is change a carbureter,like OS's. sometimes ,a better carbureter can totally change the quality of a Magnum. but if you dont have a suitable one, that is a problem, but remember dont touch Idle mixture until you are 100% sure you can make it works better. about impression, I have no idea, some people change the spring of valves,they use YS and OS 's spring. it works, but it doesnt help a lot. as for life time,unfortunately, we can do is noly a half price of OS after all.
Anyway, ASP or magnum is definitely not good for beginner. My first engine is a ASP 2S 52,and I am trying so hard to forget about experience with that engine.....

thanks for reading
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Old 10-20-2013, 05:19 PM   #2
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Re: Some info and suggestion about Magnum engines

I think in the last five years or so they are a little better than in their formative years. OS and T Tiger had some nasty teething problems in the first ten years or so too. TT still is a bit sketchy with some tolerances even now. OS is very good though now. A first engine is always a learning experience too, especially if there is a nagging problem.
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Old 10-24-2013, 02:56 PM   #3
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Re: Some info and suggestion about Magnum engines

I picked up two Magnums while in California a few years back.
Their 2 stroke 46 spent a year and a bit roaring around in a 46 size Twist. Good power match. It is a great little engine with a bad carb and cheap ball bearings... carb leaks and hard to tune right. My SECOND replacement set of bearings now installed! I made the mistake of taking the old ones in and asking my local bearing house to replace with same-same. Bad idea! Get good to really good replacement bearings.
I need an OS 46 carb to turn it into a gem. Someday I'll find one.
For the very low cost, it's been fun to experiment and see what you get. It ain't dead yet, either...still great compression, so there's life left...

The other Magnum is an FS 90, and is in very light duty, putt-putting around in an 84" 1/5 scale Piper Cub. The power could be better, agreed, but it's actually kinda scale-like on this Cub....grunts to get over the top in a loop from a cruise speed start, and totally runs out of pull on a hammer upline, so that's really authentic!
It is installed inverted, and after adding a Sullivan on-board glow set up to come on at 1/3 throttle and less, it is extremely reliable in the air.

Summary comment on Magnum from my limited experience: Cheap. Fun if you like engine work. Not fun if you want OS style performance.
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