rightflyer

Some of my club members insist Magnum are made by the same company as OS. They claim the parts are identical. Personally I find it hard to believe.

Dave Barrow-RCU

Ask them what they've been smoking, then tell them they better stop before it completely rots what's left of their brains. There is no comparison, if any parts fit, it's because Magnum makes a very poor copy of an OS.

Dauntae

Must be one big company, One has Made in Japan on it and the other has made in China, Magnum is a good engine BUT it aint no OS so if they insist ask them why magnum has Made in china on the case and is a copy of OS OS has made in Japan on it.

Dauntae

Toucan

My Feedback: (1)

Hi,
Magnum is not a copy of OS . I have opened both engines the tappet are not the same the carb is not the same . Quality of material used by OS is far far superior then Magnum. Their is a lot of difference.

What they have tried to copy is Metric sizes of the Crank shaft and Dimensions.

Thanks

Sharad

Rodney

As an owner of both OS and Magnum 4-strokes, I find that the Magnum comes very close if not equal to the OS in performance and is probably a little easier to set up for good idle and transition. The Magnum's are an excellent buy and well worth the money.

rhomco

My Feedback: (2)

I worked several years in Taiwan and toured the Thunder Tiger factory as a guest. Here is the scoop.... Thunder Tiger started the Magnum line of engines several years ago in Taiwan but later moved the operation to mainland China to save costs. The Magnums are mostly made in China now and are copies of the old OS Engines. Many substitutions and shortcuts are used to keep the price down. The thunder Tigers are still made in Taiwan on CNC machines and are superior to the old Magnums. As the China factories convert to CNC machines the consistancy will improve but I doubt the materials will. In any case, you get more engine for the $ with these imports but do not expect to get an OS for the price of a Chinese knock-off. The Magnums and Thunder Tigers will never be the quality of the OS but you will never be asked to pay the OS price either.

Perminator-RCU

The new XLS-magnums are copies of the OS FX. I hear they are pretty darn good!

William Robison

My Feedback: (3)

Gentlemen:

I have many Magnum and OS engines of various sizes.They are more similar than different.

My latest Magnum is a 46XLS, latest OS is a 46FX. The biggest difference in the two is the price. If it weren't for the names on the outside you'd be hard pressed to tell them apart.

I've never had a Magnum that did not give service equal to the OS from which it was copied.

I have absolutely no reservation whatever about recommending the Magnum line. And don't ask why I still buy an OS engine now and then - I surely don't know, maybe I just want to waste the price difference.

Bill.

Ernie Misner

The new Magnum .52 XLS surely is NOT cheap at $120. I would expect that it extremely high quality.

Ernie

William Robison

My Feedback: (3)

Ernie:

The new Magnum .52 XLS also is NOT an OS copy.

Bill.

SALMONBUG

My Feedback: (1)

my experience is that a if you perform a good breaking in on a magnum engine, you will have a reliable and easy to operate engine, similar to OS.

In my opinion there are only a very few amount of "bad engines", but some engines need more atention at the very begining of their live

raymcm

Magnum, SC and ASP are all the same engine but vary in price, unlike OS they do not come with flaky liners of the FX series and crap plain bearings like the LA series.

Ernie Misner

The Magnum 52 XLS and the new ASP 52 don't look the same as the photo at Just Engines. (they just show the ASP, but the Magnum is in the later magazines)

Do you suppose they have the exact same internals, porting, etc., however? And the ASP is a LOT cheaper I think!

Thanks!

Ernie ([email protected])

flytheedge

My Feedback: (84)

You have to know the background of Magnum and OS. I'm not going to go into the details, but they are comparable. More often than not, some pars do interchange and I love my Magnum engines. I've had a XLS .46 and now I'm going to get a XLS .52. They are wonderful engines and are easy to run.
Clint

BULL-RCU

My Feedback: (15)

To the person asking about the ASP vs Magnum. I have both and other then label I see no difference. I have only the newer models. One of my best running motors is a ASP 61 four stroke which I use in my Eindecker. At Idol speeds it never lets me down and transition to full power is smooth. At the field every time I fly my Eindecker with slow scale movements people always comment on how great the motor purrs and are surprised when I tell them it's an ASP!

f2racer

OS has got them some of the best casting machines in on the planet in Japan. The engines they produce look near flawless on the outside. Fortunately for us, the outside appearance has nothing to do with performance (although they are purty to look at). Most of the newer Magnums are equals of what OS is putting out in terms of power and reliability... Haven't been in the hobby long enough for an engines longevity to influence any of my purchases, but if OS is making their engines outta better material, I'd guess they'd have an edge in that arena.

But to answer the original question, there is no connection between OS and Magnum other than the fact that Magnum looks to be going a fair job at "cloning" OS models a couple of years after they come out.

DarZeelon

Ernie,

The magnum .52 no longer costs $120, but $100, as you can see here: http://66.166.212.3/gallery/210760.asp .

With its extended, high volume muffler it will likely outrev the $160 OS.50SX, on any prop.

And it has true chromium ABC piston and sleeve; not ABN like non-ring OS (.46FX).

DualdudE

They aren't identical One of my fellow clubmembers owns some Magnum engines and they run very good I would never ever waste my money on an OS. Far to expensive for what you get. Not that i say they are bad engines, but i can get something with a better price/quality ratio My bucks (euro's) go to Irvine and MVVS

Windwalker

My Feedback: (2)

Ha Ha Ha Ha

Next time one of these guys say an OS is the same as Magnum pull out a world geography book and tell them Japan is the same country as China!

Windwalker

yard-dart

My Feedback: (35)

Here's what I've heard, and more than once. A guy that used to work for O.S., don't know who or what his positon was, went to work for Magnum. He supposedly helped Magnum try to clone the .46 FX. By the looks of the new Magnum .46XLS, they did a pretty good job of it. I have seen the new Magnum 46 run, and it seems that Magnum has made a very large improvement compared to their old .46XL, which was IMHO, a dog. The new engine, from what I've seen so far, seems to be very strong and dependable. It seems to be a bit finicky, as far as the low end is concerned. Now, I myself have never encountered any of the liner peeling like others have stated with their FX's, so I have to say that I was very pleased with mine while I had it (sold it to buy a Picco). To sum it up, from what I've seen of the new Magnum .46XLS, it seems to be in a very close race with the O.S.

MUISER

My Feedback: (3)

I purchased a new Magnum 46 from an EBay auction for aroung $76.00. Once I got the low speed idle adjusted it is on the best engines for the money I own. It starts ealily, has a lot of power, is good looking (for an engine) and is reliable. For the money, you can't go wrong. I fly it on a Kaos and it will pull it vertical as long as you point it there.
If you haven't tried one, what do you have to loose.

f2racer

Close yard dart, you're thinking about Kaz Mihara the former design chief at OS (and possibly a former President as well?) who went to Thunder Tiger. I think he left OS before the FX line was introduced... Patent laws mean crap to the the red Chinese. I bet Magnum is just plain reverse engineering OS's models to save R&D costs. If you look at older models, parts are even interchangeable.

maxtenet

Magnum and OS are different engines by different manufacturers. The main similarity is that they are both vanilla, run of the mill, average engines, so who cares?

Max

ZM2000

My Feedback: (1)

Magnum and OS have very big difference:

PRICE, LABEL & ORIGIN

I own many of both and could not find any other difference. Many claim there is difference in metallurgy but who has done the laboratory test? Show me the superior metal content.

William Robison

My Feedback: (3)

ZM:

Lab tests not necessary.

OS cylinder liners peel.

Magnum cylinder liners do not peel.

QED.

Bill.