RE: *Magnum XLS 52A Engine *

RE: *Magnum XLS 52A Engine *
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RE: *Magnum XLS 52A Engine * - 11/15/2004 8:08:56 PM

MerlinL14

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Joined: 1/3/2004
From: Liverpool, UNITED KINGDOM
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quote:

ORIGINAL: Razor-RCU

Well the Magnums (52's) do seem to be good engines for the price, I prefer the TT Pro-46 on a budget---

I have the OS-50SX and it a GREAT running engine.... Has noticeably more power than the 46FX, probably similar to the Irvine-53

]

Probably the most unbelievable post you have made this year

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Post #: 26

RE: *Magnum XLS 52A Engine * - 11/16/2004 12:13:17 AM

ben flyn

Posts: 1463
Joined: 11/12/2003
From: Windsor, CO, USA
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quote:

ORIGINAL: MerlinL14

quote:

ORIGINAL: Razor-RCU

Well the Magnums (52's) do seem to be good engines for the price, I prefer the TT Pro-46 on a budget---

I have the OS-50SX and it a GREAT running engine.... Has noticeably more power than the 46FX, probably similar to the Irvine-53

]

Probably the most unbelievable post you have made this year

The Irvine would eat the O.S. 50's lunch! They are NOT comparible! We have both of the at our field, in the same planes and the Irvine runs about 20more mph.

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Post #: 27

RE: *Magnum XLS 52A Engine * - 11/16/2004 7:37:45 AM

Ernie Misner

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Joined: 7/5/2002
From: Tacoma, WA, USA
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>>> my question is why are there no threads with people replacing the exact same carb on the Evloutions?? >>>

Keep in mind that the exact same carb seems to work fine on the Magnum 40 and 46 XLS also. I even took the carb off of my 52 that had terrible transition (rich spot) and was dead sticking, especially on takeoff, and put it directly onto my magnum 46. It ran fine. There are two possibilities that I can think of. The extra cubic inches of the 52 might require a carb dedicated to it rather than borrowing the carb off of the 40. Another possibility is that the direction of the porting in 52 aims fuel a little too much directly at the glow plug which would exagerate a rich spot that might otherwise go unnoticed. Interesting that the folks at the service department say you have to use a HOT thunderbolt plug. Now just what is it that they are trying to mask?

Ernie

Ernie

(in reply to ben flyn)

Post #: 28

RE: *Magnum XLS 52A Engine * - 11/16/2004 8:44:47 AM

DarZeelon

Posts: 7110
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline

Ernie,

Using a warm, idle-bar type plug, from Fox, for example, will tell you if this engine has the same problem as some MDSs, that need the idle-bar, so they would not drown...

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Post #: 29

RE: *Magnum XLS 52A Engine * - 11/16/2004 8:56:27 AM

Ernie Misner

Posts: 3160
Joined: 7/5/2002
From: Tacoma, WA, USA
Status: offline

Hi Dar,

About the third time out I finally switched to a K&B idle bar plug. That did help trememdously! At least it kept the fire lit during transition and brought the plane home all in one piece until I put the OS carb on it.

Ernie

(in reply to DarZeelon)

Post #: 30

RE: *Magnum XLS 52A Engine * - 12/5/2004 7:56:34 PM

mprediger

Posts: 38
Joined: 11/14/2004
From: Near Music City, TN, USA
Status: online

There was an earlier post referring to the tight fit on the 52 xls. Because of that there needs to be a careful (and somewhat lengthy) break in. On the bench ran 2/3 of a gallon of Cool Power 10% with 2 oz of Klotz castor added to the full gallon. Ran at full throttle 5-7 minutes per run, alternating full rich (barely running) to a rich running condition with a 10x6. Flew the new plane last week and has zero transition problems. Part way through the day had to readjust main needle one click leaner as it seemed to finish the break in process. Was running an APC 11x6 and the rest of the break in fuel. Would fly level at approx 1/3 throttle and no problems powering up. Idles at 1850-1900 with no adjustments from factory setting on low speed mixture. Next clear day switching to a 12x6. Seemed like it would pull vertical until it ran out of fuel (on a practice pattern plane - Skylark now discontinued from Hobby Lobby). I run the engines a little rich for reliability and durability and you could place your hand and the head and leave it there. Also using an OS A3 plug.
Best Regards,
mike

(in reply to Zippi)

Post #: 31

RE: *Magnum XLS 52A Engine * - 12/5/2004 8:41:15 PM

DarZeelon

Posts: 7110
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
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Mike,

You used the wrong technique!

Breaking-in a tapered-bore, ABC engine, like your Magnum, extra rich and too cold to expand the cylinder top, could be detrimental to its health. Check if when the engine is cold and the glow plug is removed, the piston still catches in the sleeve at TDC.

It should.

Read this RCU thread and with your next engine, follow it to the letter, to get the longest possible life for your engine.

< Message edited by DarZeelon -- 12/5/2004 8:42:41 PM >

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Post #: 32

RE: *Magnum XLS 52A Engine * - 12/6/2004 8:30:29 AM

Ernie Misner

Posts: 3160
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From: Tacoma, WA, USA
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Lucky you Mike, you got a carb that works. I wonder if Magnum has made any changes?

Ernie

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Post #: 33

RE: *Magnum XLS 52A Engine * - 12/6/2004 5:58:28 PM

blvdbuzzard

Posts: 1487
Joined: 6/16/2002
From: boulevard, CA, USA
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Two weeks ago I was out flying my Ugly stik that has the .52 on the nose. The first flight was great as I am one of thre lucky few that have not had the rich mid range. The second flight ended after about 20 seconds when it went rich in the mid range just after take off. My first thought was, great now I am getting what the others have been complaining about. Landed and restarted, adjusted the engine and it seemed just fine. Well it went rich again. I could idle around or slam it through the mid range into the top end and it screamed.

After that flight I landed and changed the glow plug. It was a little better but not much. I let the plane sit for a while and flew my other planes. The other planes us the same fuel and did not have any bad habits. This was the same fuel I had used so it was almost gone. I did not fly much this summer but last really flew inspring. I switch to the new gallon of fuel and the .52 was just as it should be. No rich mid range and it ran like a jewel.

Was it the fuel, the plug???? I think it was a little of both. I feel the carb is overly sensitive of adjustment and old fuel or plugs can make a hugh differance in the way it runs.

Just glad it is back to normal.

Dru.

(in reply to Ernie Misner)

Post #: 34

RE: *Magnum XLS 52A Engine * - 12/6/2004 7:45:39 PM

Pepe J

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From: Canada, BC, CANADA
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Dru... The majority of your problem I believe is in the carb. Bottom line here after reading every thread on this engine and I will also con-cur that these carbs. are N.F.G. I have set mine in the morning and would be re-adjusting it a couple of hours later and vise-versa. Having never touched it from the last time out and it would be running O.K., then a few hours later it would run like a top. As soon as the air-density has a slight change it is affecting the performance of this carb.
You're right, these carbs are very sensitive, but there is not much one can do when the low end is running rich and you have run out of needle adjustment except wait for a change in weather or use an alternative like an O.S. carb.

Happy Fly'n...

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Post #: 35

RE: *Magnum XLS 52A Engine * - 12/6/2004 9:55:22 PM

Ernie Misner

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From: Tacoma, WA, USA
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Personally I think the Magnum 52/carb combo is possessed and can rear it's ugly head at you at any time, and most likely will happen to you right after takeoff, with the nose pointed dangerously up and only 10 feet off of the ground. (hasn't happened to me... yet... but the OS carb sure makes me sleep better :-)

I don't think it entirely the carb either. My best guess is that on that engine, the direction of the schernule porting is such that any richness whatsoever directs excess fuel right at the glow plug. Even the magnum service department recommends that a HOT thunderbolt plug be used on the 52. Now why would they have arrived at that conclusion knowing that you are asking for trouble with that plug on a hot day or with a lean run? Do you think that they would ever admit to a problem with the 52?

Ernie

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Post #: 36

RE: *Magnum XLS 52A Engine * - 12/7/2004 12:56:24 AM

ben flyn

Posts: 1463
Joined: 11/12/2003
From: Windsor, CO, USA
Status: offline

quote:

ORIGINAL: Pepe J

You're right, these carbs are very sensitive, but there is not much one can do when the low end is running rich and you have run out of needle adjustment except wait for a change in weather or use an alternative like an O.S. carb.

Happy Fly'n...

You bet they're sensitive when the low end needle is only 3/4 of a turn out!

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Post #: 37

RE: *Magnum XLS 52A Engine * - 12/7/2004 6:10:28 AM

Ernie Misner

Posts: 3160
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From: Tacoma, WA, USA
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I wonder if the Magnum 40 and 46's run with the low speed needle nearly closed?? (same carb)

Ernie

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Post #: 38

RE: *Magnum XLS 52A Engine * - 12/7/2004 8:46:57 PM

blvdbuzzard

Posts: 1487
Joined: 6/16/2002
From: boulevard, CA, USA
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I have a Magnum .46 and it runs with the needle set about 1 1/8 turn out from closed. I have not had a tuning issue with the 46 execpt when running a Pitts muffler.

Ben Flyn, you have your needle to far out

Mine is between 3/4 and 5/8 of a turn out. When I found the sweet spot on mine, I was turning the low needle about 1/32 of a turn each time and it did effect the tuning, where as on my other brands you could go 1/2 turn and not really notice it.

If they redesign the carb and do a good job of QC, this engine will be a real winner.

Dru.

(in reply to Ernie Misner)