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Opinions on Magnum 4 strokes please - 5/15/2010 3:58 PM   
Mugen Mbx5



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Status: offline 		I was thinking about picking up a magnum 4 stroke (70 rfs) and wondering if they are good motors? Do they hold a tune and are they user friendly? Should I just spend the extra $ and go with a Saito or O.S.? I have been flying O.S. 2 strokes for a while and they run great and hold tune perfect but I have one that is in need of replacement so I was looking to try a 4 stroke.

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RE: Opinions on Magnum 4 strokes please - 5/15/2010 4:48 PM   
rgm762


 

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Status: offline 		I have three, a 52, 70 and 120. don't have problems with any of them, they tune easy and seem to hold their tune, will say they come from the factory set VERY rich on the low end

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RE: Opinions on Magnum 4 strokes please - 5/15/2010 5:08 PM   
jeffie8696



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Status: offline 		You will find a lot of info in the glow engines forum. If you get a good one they are not a bad deal. Luckily if you get a bad one Hobby People are very good about warranty. If you buy a bad used one you are just out of luck.
Mine had so many issues HP just gave me a new one, it seems to run OK.


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RE: Opinions on Magnum 4 strokes please - 5/15/2010 5:48 PM   
bkdavy



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Status: offline 		I have two 91 rfs that I picked up used a couple years ago. I've been very happy with them. The low end on both was set very rich, but once I got them set, they've stayed that way.

Brad

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RE: Opinions on Magnum 4 strokes please - 5/15/2010 6:51 PM   
Gray Beard


 

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Status: offline 		They either run or don't run, they will be a good engine or total crap. I'm not a big fan of Magnum, seen too many of them that are total crap.

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RE: Opinions on Magnum 4 strokes please - 5/15/2010 7:04 PM   
oldvet70



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Status: offline 		I like OS and Magnum for normal sport planes. As a matter of fact I just replaced a Saito with a Magnum. I have a used FA-82 I'll be selling. You can PM me if interested, I'm headed out to fly right now. My latest  4 Stroke purchase was a Magnum 70 rfs.

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RE: Opinions on Magnum 4 strokes please - 5/15/2010 10:23 PM   
jimmyjames213



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Status: offline 		magnums are great little engines. the .91fs will compete with the os and saito versions on power, weight and reliablity. the 70 is the same its just a little heavier than the others, the .52 is a good little engine for a .40 sports plane you just want to putt around the sky
all of my magnums run great and i would buy another in a heart beat

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RE: Opinions on Magnum 4 strokes please - 5/15/2010 10:51 PM   
Jerrybl


 

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Status: offline 		If you can't tune,don't fly,or atleast get help. Magumes are like a fine women,it takes a sertine touch if you dount have it work on it. Or as last resort read the book. Or find some more books.

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 12:22 AM   
Gray Beard


 

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quote:

ORIGINAL: jimmyjames213

magnums are great little engines. the .91fs will compete with the os and saito versions on power, weight and reliablity. the 70 is the same its just a little heavier than the others, the .52 is a good little engine for a .40 sports plane you just want to putt around the sky
all of my magnums run great and i would buy another in a heart beat

Truth now, no BS allowed, how many of these engines have you ever owned. As I recall the Magnum .91 is your biggest engine you have had from reading your posts. To compare the power or operation of a Magnum with two of the top three engines on the market is just silly. A Magnum is a clone of the very old style OS engines and OS have
improved just a little over the decades. Why do you think they sell Magnums for so little compared to any of the top three??

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 12:47 AM   
rgm762


 

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Status: offline 		I'll go along with Grey Beard, my magnums are great for what they are, but in no way would I ever compare them to a saito or os, an example, I have a mustang with the mag 70,a friend has a mustang with a saito 72, both are running same prop, no way i can keep up with his, if a person wants to get into the power to weight ratio etc etc, magnums won't match up, but for a nice running, inexpensive engine, their hard to beat

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 1:13 AM   
goirish



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Status: online 		I have 7 Magnum 4 strokes from 52's to 180's. All I have to do is start them and fly them. Never owned a Saito or a OS 4 stoke. So I won't try to compare. I do like my Mags. While I am flying others are tuning. 5 flights this morning on my 91.

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 5:35 AM   
Gray Beard


 

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quote:

ORIGINAL: rgm762

I'll go along with Grey Beard, my magnums are great for what they are, but in no way would I ever compare them to a saito or os, an example, I have a mustang with the mag 70,a friend has a mustang with a saito 72, both are running same prop, no way i can keep up with his, if a person wants to get into the power to weight ratio etc etc, magnums won't match up, but for a nice running, inexpensive engine, their hard to beat

For under 150 bucks and you just need to try a four stroke then a magnum may be the way to go?? I know a lot of people that like them for Sunday flying and swear by them, I know others that have had nothing but trouble with them and just swear at them. Gene, I'm not a needle twister, if it ran good last week unless something has really changed then my engines should run fine this week, I never touch the needles unless I change prop size or the weather takes that nasty drop that we get every year. My point is that unless someone has owned and used something don't try to compare, that dwells on the silly and some people may believe it. If a magnum was a true power house or a fantastic engine then you would think you would see them at different events. Why should someone buy a $400.00 engine when they can get the same power and performance from a $150.00 engine. Too many people are listening to the peanut gallery and posting it here as fact and beginners are going to beleave it. That's just not right. When I get a Magnum in a trade I sell it or give it away, I'm a YS and OS person but will keep the saitos if I come across one in a deal. I have found some cheap two strokes I like as well as OS, but I haven't got enough time to say if they will last as long or not. All I can say is they have been good engines and trouble free. The price is really right too!!!!!!!!!!!!!

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 5:56 AM   
nh4clo4


 

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Status: online 		I hae a 30 Four stroke in a small stik, It has ran beautifully ever since I got it used. I also had an OS 30 FS, The OS had a little more power, but the Magnum is really nice,  I put 4 flights on it today, without a hiccup.
Ed

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 6:35 AM   
oldvet70



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Status: offline 		It is always interesting to see just how emotional we seem to get over engines. I've been running glow and gas engines for some time. I still have my Dads Baby Cyclone from when he was young, he's 85. I don't believe it is bad advise to recommend Magnum engines to new flyer's, but I think it is a mistake to recommend YS. For years as an instructor I flew many many different engines and airframes. Some I liked some I didn't. I prefer OS engines mostly. I have a couple Magnums from 70-1.20. All purchased when I did not wish to spend a lot of money on an engine but wanted a 4 stroke. If a person gets a New Magnum and has trouble it has a warranty as do other engines, Not everyone can afford the top line equipment and need a more economical means of propulsion. Magnum fits that bill quite well. If the OP gets a magnum and follows the factory recommendations he should be happy with it.

Just today I flew a New Magnum 70, the exact engine the OP was interested in. It is a fine engine. Maybe it won't hold up but most likely it will. I say if what you can afford is a Magnum go get it. You can find a lot of used Saito's at bargain prices if someone convinces you that you need to go that route.

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 6:50 AM   
Srewinkel


 

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Status: offline 		I have 2 magnum 70, 52, an os 70, and a saito 82.  Comparing the magnum 70 to the os 70, I would say the magnum had just as much, if not more power.  The os did idle much better though.  I don't really like the saito because of how oily it gets. Also it is under powered for what i want, but not engines fault.  I have also owned a couple YS engines, and loved them great power great idle, just a bit tricky to tune.  As for what engine to buy, you really can't go wrong with a magnum especially if you just fly for fun.

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 7:46 AM   
MetallicaJunkie



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Status: offline 		for 3D try a 14X4 apc on the 70,,,,should rev atleawsr=t 9krpm.....or 13x6 apc for sport

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 7:48 AM   
MetallicaJunkie



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Status: offline 		try a 15x4 ap on the 91 shioukld erev higher....for sport flying 14x8

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 8:22 AM   
lkruse


 

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Status: offline 		I have two Magnum .52s, a .70, two .80s, and a 1.20. All except the 1.20 are currently in airplanes and run very well. I also have three Saitos and three OS 4-strokes. My experience with the Magnums has been very good. They have adequate power for sport aircraft and have started and run flawlessly for me, after breaking in as per the manual. That said, I am an intermediate sport flyer and don't push engines very hard. I went through the same quandary about price vs. quality before buying any of my 4-strokes, but after getting my first Magnum have never been worried about the issue since.

I've attached a picture of my Sig "Sig Hog Bipe" with a Magnum .70 up front.

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 4:34 PM   
Gringo Flyer



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Status: offline 		Dont buy the 70 go for the 91. They weigh almost exactly the same. The 91 is a fantastic engine that is easy to tune. Don't know why someone would say a magnum is finicky. If you can tune any run of the mill 2 stroke the magnum 4 stroke will be fine. I have put the 91 in 40 sized airframes.

It doesnt compare power and weight wise to the saito but cost half as much. It matches up pretty well to the OS, again at a much better price.


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RE: Opinions on Magnum 4 strokes please - 5/16/2010 8:46 PM   
jimmyjames213



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quote:

ORIGINAL: Gray Beard


quote:

ORIGINAL: jimmyjames213

magnums are great little engines. the .91fs will compete with the os and saito versions on power, weight and reliablity. the 70 is the same its just a little heavier than the others, the .52 is a good little engine for a .40 sports plane you just want to putt around the sky
all of my magnums run great and i would buy another in a heart beat

Truth now, no BS allowed, how many of these engines have you ever owned. As I recall the Magnum .91 is your biggest engine you have had from reading your posts. To compare the power or operation of a Magnum with two of the top three engines on the market is just silly. A Magnum is a clone of the very old style OS engines and OS have
improved just a little over the decades. Why do you think they sell Magnums for so little compared to any of the top three??

how many have i ever owened, 2 magnums the .52fs and the .91fs

i help club members tune their engines because most have the basics down and can get the engine running reliably but not as well as it could, so i usually help them fine tune it. i have messed with 5+ saitos .91, 2 os .91, and 1 magnum .91 (wasnt mine). useing a tach on the same day my magnum.91 will turn a apc 14x6 and apc 13x8 just as well if not better then both of them. it doesnt idle as well as the saito but its so close its irrevelent. throttles just about the same and is very reliable (i have yet to have a deadstick with this engine having put about 5 gallong through it.)

now the smaller magnum, my .52, isnt as good as similer saito's or os's. they idle and transition better than the mangum, through top end is about the same. my engine is still relitivly new and im only useing 0%-5% nitro so im not expecting perfect idleing or throttleing, its good enough for sports flying.

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RE: Opinions on Magnum 4 strokes please - 5/16/2010 9:31 PM   
Gray Beard


 

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Status: offline 		Nuff said.

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RE: Opinions on Magnum 4 strokes please - 5/17/2010 12:25 AM   
cruzomatic


 

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Status: offline 		Great engines. I have a lot of them, but did experience my first bad one just last week. I have it on my Sig Skybolt ARF and had my Mag .91RFS crank break while flying. I was able to get it down deadstick fine, but the engine is toast with a busted crank. I'm only assuming the bearings gave way too and maybe even the piston. etc, etc. The engine was purchased about a year and a half ago but only had about a gallon through it as it sat new in the box for a long time before finding a ride. Anyway, I called Magnum and they said the 'warranty' was expired and I would have to pay to have it rebuilt. The metal on the crank was different shades so there was surely something wrong with it from the start and it was only a matter of time. Oh well......just my bad experience with one of my many Magnums.

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RE: Opinions on Magnum 4 strokes please - 5/17/2010 8:16 PM   
bigedmustafa



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Status: offline 		I own 4-strokes from Saito (.72), Magnum (.52 RFS x2), Enya (.60 4C), and Thunder Tiger (F-91s) and I like them all.

I have a Saito .72 in my Thunder Tiger Imagine 50 pattern plane and my buddy Fred has the same plane with a Magnum XL .70 RFS in it. He might have a slight edge in power. I brag that my Saito .72 is so reliable that it's like having a brushless outrunner that runs on glow fuel instead of LiPo batteries. After it got broken in and set up, it just hasn't required any fussing around. I fuel it up and fly it.

I'm a very big fan of the Magnum XL .52 RFS. I've got one currently installed on my 84" Quaker, and I use it to putter around just a couple of clicks above idle. I've also flown one in a Phoenix SeaBee 40 pattern/sport ARF, and I was delighted with the power output. Whether you're cruising around at a leisurely pace or you want to open up and fly full blast (or any speed in between), the .52 RFS delivers.

I really like my Saito four stroke, but I'd likely only purchase another for a "special" project of some kind. For my projects, I've been very pleased with the performance and reliability of Thunder Tiger and Magnum four stroke engines. I sure wouldn't try talking anyone out of buying a Saito, however, if they don't mind spending a little extra.

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