|Published Engine Specifications|
|Practical RPM:||1,800 – 11,000|
|Weight w/Muffler:||21.2 oz.|
|Manufacturer:||Magnum by Global|
|Available From:||Hobby People|
The engine was adequately packed and had no damage. It came with some very good documentation including an operating manual, a maintenance sheet explaining valve settings, an exploded-view drawing with part numbers, a quick start guide, a decal sheet and a very detailed troubleshooting chart. The engine also had 2 allen wrenches for service. It did not include a feeler guage for setting the valves, any measurement data, or a glow plug.
There was not a measurement chart included with the engine so these are the measurements I made. Bear with me, here goes…
|Case width (not including mount lugs):||40mm|
|Overall case width (including mount lugs):||57mm|
|Mounting hole width (center to center):||50mm|
|Mounting hole (front to rear, center to center):||21mm|
|Drive washer back to front mounting hole:||55mm|
|Drive washer to tip of crank:||36mm|
|Mounting hole diameter:||4mm|
|Height (bottom of mount lug to valve cover):||98mm|
|Bottom of mount lug to bottom of case:||21mm|
|Drive washer to back plate:||86mm|
|Drive washer to rear of carburetor:||113mm|
|Drive washer to back of choke bracket:||119mm|
Check out the nipples in the intake and at the base of the cylinder just behind the cam cover in the photo above. These are connected together via a short piece of fuel line and make up the re-breathing crankcase vent. It expels excess oil from the nipple behind the cam cover and draws it into the intake to use it again. There are only positives to this arrangement. It provides it’s own “top end” lubricant, it’s eco-friendly and it helps keep your plane slime free.
The offset manifold allows the throttle arm to be a wee bit more ARF friendly...due to a lot of manufacturers pre-drilling throttle linkages for 2 strokes. This puts the arm right in line! No more bending horseshoe shapes in the throttle rod!
I broke in the engine per the instructions. Magnum recommends that a fuel with 10% nitro and a blend of 16% Castor/synthetic oil be utilized for break in. They also recommend a 13-6 prop for break in. I used a Master Airscrew 13-6 K series and an O.S. Type F glow plug.
After running 40 ounces of fuel through it, the engine remained trouble-free. I had to richen up the low speed needle only 1/8th of a turn to get a flawless transition. I then changed to the maximum nitro content in the form of 15% Cool Power with Byron’s Castor additive.
The following RPM readings were taken at 300 RPM below absolute peak.
|Master Airscrew K series||12-8||10,500|
|same||14-6 (largest recommended)||8,800|
For detailed flight coverage, watch RC Power for an upcoming review of the Global Decathlon, including flight testing with this engine!
The Good Stuff
The Not So Good Stuff
The Magnum XL.70RFS is one sweet engine. All throughout the testing, it never gave me so much as a hiccup! It’s ruggedly built, trouble free, strong and inexpensive. This is a no brainer. An engine that delivers premium performance at a value price needs your attention! It has a rapid and seamless transition, even when swinging the big flat blade 3D props. It’ll idle down to 1,900 RPM, reliably. As a matter of fact, The RPM numbers for the MA 13-6 AND the APC 14-4W props match my O.S. FS-70 S2 exactly!!!
I would not hesitate to recommend this engine to anyone.
|May 30, 2004, 11:06 AM|
If anyone has any questions or wants to know about any details that I may have missed, I'll do my best to get them answered.
A special thank you to Don Sims for shooting the video on this engine.
|Oct 13, 2004, 03:54 PM|
Pete, I'm measuring 98mm from the centerline of the crank to the top of the valve cover.
I just happened to be mounting another one of these on a different plane... Good timing huh???
|Nov 09, 2004, 08:19 AM|
I have no official word on weather the ASP and Magnum engines are from the same factory but, from looking at them, I suspect they are. Either that or someone copied them exactly except for the logo's.
The XL70RFS is one of the best engines I've ever had. It takes all the stuff I do to it in stride and never complains. I love it!
|Jun 24, 2007, 07:18 AM|
Do You Think There Is Significant Power Increase For Me Switching From The Mag 61 To The Mag 70 ? The Mag 61 Makes My Sig Senior A Tad Sluggish Since Converting Her To A Tail Dragger...thanks
|Aug 25, 2013, 08:00 PM|
Joined Dec 2012
Same as ASP 91 From Hobby king
This is the same motor as ASP 91 from hobby king. Same company. I bought an ASP 91 4 stroke head for my magnum 91. Same head as the magnum. Hobbypeople 64.95 Hobbyking 29.95 All the parts are the same as the magnum. Same motor and a lot less money. Thought i would share that with you.
|Oct 19, 2013, 12:31 AM|
Joined Sep 2013
|Oct 20, 2013, 05:02 PM|
Joined Oct 2004
setting the valves isn't a big deal compared to changing the bearings IMO.
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