RE: Club MAGNUM !

RE: Club MAGNUM !
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RE: Club MAGNUM ! - 4/22/2008 4:27:51 AM

Posts: 51
Joined: 7/16/2007
From: Invercargill, NEW ZEALAND
Status: offline

See my post re my SC 46. (same as a magnum engine) It is doing similar things to yours. I am sorry I could not solve the problem, even after trying everything anyone at my club could think of including replacing the carb with another from an engine that ran fine, the problems still persisted. My engine also started off life running a lot better than it does now, but it has always been difficult to transition from full power to a lower power setting. A guy in a model shop told me most of the Chinese engines are fine, great value for the money, a few are difficult to tune but once achieved are then fine, but there is the odd one which no matter what you do will just not run properly. I believe that I have one of these engines that just won't run correctly.

Footnote. Update I have now retired the SC 46 from active service, unless someone can come with a reason it won't transition correctly. I have also read that these engines lean out a lot when in the air, all the experienced modelers that looked at / tuned the engine always felt that the engine was set rich, so running to lean in the air is unlikely to be a cause of the problems, there was always a distinct and visible smoke trail while the plane was flying.The SC 46 has been replaced in the plane with a brand new OS 40 LA I had lying around, but didn't use desiring the additional power of the SC46. With the OS 40 LA there is still plenty of power, and most flying days the engine is just started and you fly, with no need for any engine adjustments, on a very few days days perhaps a click in or out on the needle valve is all that is required. People say the OS 40 LA is not an overly powerful engine and that the SC 46 has lots of power for a 46 and yet there is little difference in the performance of the plane with each engine in it, another guy at the flying field had a GMS 35 and its exhaust note was much crisper than the SC46s, these points reinforcing my idea that there is some internal manufacturing fault with the SC, causing the lack of reliability and a drop in power???? As I said before I am no longer prepared to find out, now having a SC 46 paper weight!!!!

Cheers

David

< Message edited by davidbegg -- 5/13/2008 9:11:39 PM >

(in reply to akelly)

RE: Club MAGNUM ! - 4/22/2008 4:54:35 AM

Posts: 7437
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: MOTORMAN37

Ed,
I run two filters on my YS's and have never had a problem. I also filter the fuel in the jub and on the filler hose. It depends on what kind of filters you run.[)]

You will.

Ed Cregger

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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to MOTORMAN37)

RE: Club MAGNUM ! - 4/22/2008 11:47:28 AM

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Joined: 11/30/2003
From: Cadillac, MI, USA
Status: offline

David:

The last time I saw that manner of inconsistency, it was on Tower 46s with hairline cracks in the crankcase. I chased the needles to hell and back before I threw them in the rubbish.

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Bob Hunt

(in reply to davidbegg)

RE: Club MAGNUM ! - 4/22/2008 9:40:27 PM

Posts: 51
Joined: 7/16/2007
From: Invercargill, NEW ZEALAND
Status: offline

I have not noticed any cracks, but I feel the problems are caused by something like that. As far as I am concerned it is now a paper weight, it will be impossible to get parts for it in NZ and anyway I am not prepared to spend any money on it. The old adage applies, you get what you pay for!!!!

Cheers

David

(in reply to Mustang Fever)

RE: Club MAGNUM ! - 4/22/2008 11:46:05 PM

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Joined: 6/19/2005
From: Omaha, NE, USA
Status: offline

Well, I hate to spoil the string of horror stories here. I just got done putting the first couple of flights in on my freshly broken-in Magnum XL .52 RFS.

I put it on a Phoenix SeaBee ARF, and it's been wonderful to work with so far. I broke it in using 10% Wildcat fuel and a Fox 4-stroke Miracle plug. It fired right up on the very first start with just a short blip of the starter. I put four tanks through it starting at 5,000 rpms WOT and working my way up to the fourth tank at 10,800 rpms with an 11x6 APC prop for break-in.

For first flight, I switched to an APC 12x7 sport prop. The .52 RFS spins it just under 9K (I'm still a bit rich on the high end) and is idling reliably at 2600 rpms.

The maiden flight was completely uneventful except for all of the fun I had. The .52 RFS sounds great, sips the fuel, and pulls the SeaBee through loops with great authority.

The true test of engine quality isn't how well it runs through it's first gallon of fuel, it's how well it runs through it's twentieth. So far though, my Magnum XL .52 RFS has been a pleasure to run.

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RE: Club MAGNUM ! - 4/23/2008 12:17:51 AM

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Joined: 11/30/2003
From: Cadillac, MI, USA
Status: offline

I've got the one four stroke, a 91, and its always been a great engine. Makes me wonder if the problems aren't limited to the two strokes.

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Bob Hunt

(in reply to bigedmustafa)

RE: Club MAGNUM ! - 4/23/2008 2:45:10 AM

Posts: 51
Joined: 7/16/2007
From: Invercargill, NEW ZEALAND
Status: offline

Everyone says that most Chinese engines are just fine, run really well, and are tremendous value for the price. However there are a small number of engines that just won't run properly.

I have found that it is possible to get bearings for the SC46 in NZ so if the price is OK I will get a set and see if that cures the problem. (air leaking in via the front bearing) Other wise I will have a paper weight with new bearings!!!

I would like to beat the thing, the problems have now reached the annoying and frustrating phase.

Cheers

David

(in reply to Mustang Fever)

RE: Club MAGNUM ! - 4/23/2008 2:53:42 AM

Posts: 818
Joined: 5/10/2007
From: coralville, IA, USA
Status: offline

And think of how satisfying it will be to conquer the ill running engine and make it bow to your wishes!! (Sorry, I'm an engine guy

)

< Message edited by jeffie8696 -- 4/23/2008 2:54:31 AM >

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Castor, it''s like Vitamin C for glow engines.

(in reply to davidbegg)

RE: Club MAGNUM ! - 4/23/2008 4:29:52 AM

Posts: 51
Joined: 7/16/2007
From: Invercargill, NEW ZEALAND
Status: offline

I enjoy playing with engines too(all sizes), and are pretty good, but this one has me stumped. You think you have got it licked, back comes the same problem.

Trouble is that now I am not prepared to spend any real money on the engine.

Cheers

David

(in reply to jeffie8696)

RE: Club MAGNUM ! - 4/23/2008 5:18:27 AM

Posts: 7437
Joined: 1/31/2002
From: Ringgold, GA, USA
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quote:

ORIGINAL: bigedmustafa

Well, I hate to spoil the string of horror stories here. I just got done putting the first couple of flights in on my freshly broken-in Magnum XL .52 RFS.

I put it on a Phoenix SeaBee ARF, and it's been wonderful to work with so far. I broke it in using 10% Wildcat fuel and a Fox 4-stroke Miracle plug. It fired right up on the very first start with just a short blip of the starter. I put four tanks through it starting at 5,000 rpms WOT and working my way up to the fourth tank at 10,800 rpms with an 11x6 APC prop for break-in.

For first flight, I switched to an APC 12x7 sport prop. The .52 RFS spins it just under 9K (I'm still a bit rich on the high end) and is idling reliably at 2600 rpms.

The maiden flight was completely uneventful except for all of the fun I had. The .52 RFS sounds great, sips the fuel, and pulls the SeaBee through loops with great authority.

The true test of engine quality isn't how well it runs through it's first gallon of fuel, it's how well it runs through it's twentieth. So far though, my Magnum XL .52 RFS has been a pleasure to run.

Big Ed said it very succinctly when he said, "The true test of engine quality isn't how well it runs through its first gallon of fuel, it's how well it runs through its twentieth".

I couldn't have said it better if I had a million years to think about it first.

Ed Cregger

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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to bigedmustafa)

RE: Club MAGNUM ! - 4/23/2008 6:00:28 AM

Posts: 51
Joined: 7/16/2007
From: Invercargill, NEW ZEALAND
Status: offline

Absolutely!!!!

It needs to go down into everyones memory, for little R/C engines and also big engines.

Cheers

David

(in reply to Ed Cregger)

RE: Club MAGNUM ! - 4/24/2008 5:21:58 AM

Posts: 46
Joined: 2/28/2005
From: Vine Grove, KY, USA
Status: offline

hi, just reading the thread after getting a new mag 91 4stroke yesterday in a trade deal, its going on a KMP husky. i dont have anything else for it so far and was wondering if theres an invert pitts that will worth on this engine. and what size fuel lines and plugs to use.. mine doesnt have a manual either..
mike

(in reply to davidbegg)

RE: Club MAGNUM ! - 4/24/2008 9:00:47 AM

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Joined: 1/31/2002
From: Ringgold, GA, USA
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I've been flying Sanye produced engines since they first hit the US over fifteen years ago. The first ones were sold as ASP engines. All of mine were fine, no problems. I owned a couple of .12s, a .46, a .61 ABC and a 1.08 ABC. All took a bit of a break-in and all turned out to be very usable engines.

I now own a plethora (always wanted to use that word) of Sanye engines, both ASP and Magnum. Again, no problems with them at all. Can this lucky streak continue? Yes, if you use a fuel with castor oil in it. The more, the better.

I'm not saying that people don't get a lemon now and then. Obviously, they do, but this is not unique to Sanye produced engines. I haven't found the problem rate with these engines to be significantly greater than any other engine brand. Your experience may be different from mine and I'm not saying that anyone is incompetent or lying about their experience. I just don't feel it is good to label a brand as being bad when it is unwarranted.

Ed Cregger

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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

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RE: Club MAGNUM ! - 4/24/2008 9:27:08 AM

Posts: 51
Joined: 7/16/2007
From: Invercargill, NEW ZEALAND
Status: offline

I didn't say that Sanye engine are rubbish, just that my engine will not run properly for some reason. I have seem a lot of Chinese engines that run fine. However I do believe the guy at the hobbie shop, most Chinese (Sanye) engines are fine, a few can be difficult to tune but will run fine, but a few just won't run properly. My engines istarts easily, idle is excellent, full power is fine, the transition to mid speed and down to idle is the problem, it will almost certainly stop with another dead stick landing.

My Sanye engine (SC) has been run in correctly and always run on fuel containing castor oil.

(in reply to Ed Cregger)

RE: Club MAGNUM ! - 4/24/2008 10:50:13 AM

Posts: 7437
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

As Big Ed said a few posts ago, the test of a good engine isn't how well it runs on the first gallon, but instead how well it runs on its twentieth gallon.

Many of us have been spoiled by OS and their near instant break-in. In fact, if all one has ever owned/ra/flown are OS engines, chances are great that the first venture into breaking-in new less expensive engines could be viewed as a tribulation.

One shouldn't expect any other brand of engine to run as well, out of the box, as an OS. That is what you pay the extra money for and not much else.

Ed Cregger

< Message edited by Ed Cregger -- 4/25/2008 5:37:34 AM >

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RE: Club MAGNUM ! - 4/24/2008 4:05:29 PM

Posts: 46
Joined: 2/28/2005
From: Vine Grove, KY, USA
Status: offline