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Author Topic: magnum blue head 52  (Read 3332 times)

Offline B Norton

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magnum blue head 52
« on: June 19, 2017, 09:43:09 PM »
After several attempts to get mine running consistently, it would run great about for about five or six laps go dead lean and stay there for the rest of flight. After running that way a couple of flights a couple of club member(Bob Reeves&Joe Gilbert) told me they thought it needed compression taken out of it.They were absolutely correct(nice to have experienced people to listen to).I pulled head off and hemied the head a little. Now it runs like like a big fox 35 has a distinct break to a hard two stroke when nose goes vertical.(I'm running a three blade 12-4.5 prop on my legacy)I flew five flights @five different rpm just to see if it would run that rpm throughout the flight starting @7800 all the way 8900 consistant all five flights!!It pulls that 68oz. legacy with authority! I would recommend
the magnum 52 if you need a big power for a cheaper price.
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Offline RandySmith

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Re: magnum blue head 52
« Reply #1 on: June 20, 2017, 01:21:21 PM »
Glad that the engine you have is working withe lower compression, but  what I have found over the years  is that there is  NO need  to machine the head  to reduce compression, I have a lot of Mag 52 and 53s  out there, they run very well as I send them with high compression, use 5% fuel to start, and if your popping glow plugs add a head shim to reduce compression, many are running  these with  18%  synthetic fuel  with either 2 ounces of castor  or an ounce of Aero 1  fuel supplement.  They do not like  heavy oil or heavy castor  fuels, the do great on a  13 x 4.5 or 12.5 x 4.5  prop 2 blades,  3 blade 12 x 4,5  and produce  excellent power, much more than say and old  ST 60 or a new ST 51

Randy
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Offline B Norton

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Re: magnum blue head 52
« Reply #2 on: June 21, 2017, 12:18:06 AM »
Randy thanks for the info this engine was tight when started before it would get stuck on compression stroke almost needed both hands to get it free .I'll differently be ordering one of your nice venturies for the next mag 52 I already have
« Last Edit: June 21, 2017, 02:40:28 AM by B Norton »
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Offline Matt Piatkowski

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Re: magnum blue head 52
« Reply #3 on: July 06, 2017, 03:44:00 PM »
Please see the attached.
Is this the one?
I shaved its head and installed new C/L venturi.

Now, I have to find a plane for it.
Thanks,
Matt
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Offline B Norton

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Re: magnum blue head 52
« Reply #4 on: July 11, 2017, 10:06:52 PM »
Now that's almost sexy! and that is the one !
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Offline fred krueger

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Re: magnum blue head 52
« Reply #5 on: June 15, 2018, 06:00:28 AM »
I have been experimenting with this engine for a couple years.  I have 2 Magnum .52s and 2 ASP .52s (same engine, different head.  I favor the ASP version as the head is considerably lighter).  I first powered a hand-me-down Strega with one.  I currently am trimming out a new Brodak SV-11 powered by one of the ASP .52s.  I hate to run low oil fuel in anything, so I had to decompress them with head shims to get them to run on 10-22 mix fuel.
Here is the first sloppy full pattern.  The plane, handle and pilot still need a bit of trim  :P


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Offline Carl Cisneros

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Re: magnum blue head 52
« Reply #6 on: June 15, 2018, 11:13:52 AM »
Fred
/

what prop are you using on your ASP 52 and SV11?
Also, what rpm are you setting the motor at before launch?

thanks

Carl
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Offline fred krueger

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Re: magnum blue head 52
« Reply #7 on: June 15, 2018, 08:40:23 PM »
Carl,

APC 12.25 x 3.75, ~9400 ground setting at launch.

Fred
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Offline Shug Emery

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Re: magnum blue head 52
« Reply #8 on: June 16, 2018, 08:40:10 PM »
My Score with Magnum .52 from Randy Smith.
This video is last year. Not had many flights on it but pulls great.
Shug


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Offline Carl Cisneros

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Re: magnum blue head 52
« Reply #9 on: June 18, 2018, 07:35:49 PM »
Fred
ran in to the same problem as yourself with my 2 new ASP's.

Checked the piston to head clearance and on both of mine, there WERE at .011" on each motor. (other motors might measure out at a different measurement)

Made up some head shims and they are now at .018".
they run very nice on the test stand using a xoar 13-4 and 10% fuel

Carl
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Offline fred krueger

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Re: magnum blue head 52
« Reply #10 on: August 11, 2018, 05:07:38 PM »
Further development of my ASP/Magnum 52 powered Brodak SV-11 ARF.
Setup: cylinder boost blocked (JB Weld) and a .031" head shim (I need the head space as I use a lot of oil); 12.25 x 3.75 APC prop; fuel (10/22, half castor); Merlin 2011 plug; 7.4mm venturi; Randy Smith tube muffler with rubber extension; launch rpm approx. 9700; lap times 5.2 sec on 66 foot lines (line length).
I played with several mufflers and I found the Smith muffler to be the most suitable for this setup.
This is about the 10th full pattern, so I am still adjusting to the turn and will be experimenting with handle spacing. My goal is to use the ASP .52 in a modified Legacy (currently in the bones).
Fred

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Offline Chris Fretz

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Re: magnum blue head 52
« Reply #11 on: August 11, 2018, 09:12:47 PM »
Quote from: Fred Krueger on August 11, 2018, 05:07:38 PM
Further development of my ASP/Magnum 52 powered Brodak SV-11 ARF.
Setup: cylinder boost blocked (JB Weld) and a .031" head shim (I need the head space as I use a lot of oil); 12.25 x 3.75 APC prop; fuel (10/22, half castor); Merlin 2011 plug; 7.4mm venturi; Randy Smith tube muffler with rubber extension; launch rpm approx. 9700; lap times 5.2 sec on 66 foot lines (line length).
I played with several mufflers and I found the Smith muffler to be the most suitable for this setup.
This is about the 10th full pattern, so I am still adjusting to the turn and will be experimenting with handle spacing. My goal is to use the ASP .52 in a modified Legacy

Are you running muffler pressure or open air uniflow?

Chris
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Offline Chris Fretz

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Re: magnum blue head 52
« Reply #12 on: August 11, 2018, 09:41:27 PM »
Quote from: Shug Emery on June 16, 2018, 08:40:10 PM
My Score with Magnum .52 from Randy Smith.
This video is last year. Not had many flights on it but pulls great.
Shug

Shug what Xoar prop are you running? Fuel nitro/oil content?

Thanks
Chris
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Offline fred krueger

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Re: magnum blue head 52
« Reply #13 on: August 11, 2018, 10:21:29 PM »
Chris,

No pressure, just suction on uniflow tank.

Fred
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Offline B Norton

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Re: magnum blue head 52
« Reply #14 on: October 02, 2018, 09:35:45 PM »
Great info guys your motors sound like they really are grovin! And look like pull both planes with authority thanks guys!!
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