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ASP/MAGNUM FS400AR Rebuild/Overhaul

Old 11-03-2019, 06:19 AM
  #3276  
grassie
 
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Sorry for poluting this thread with my Stearman.
I love this little engine and I am far from getting rid of it. In fact I am almost ready to pull the trigger on a UMS 90cc gas 7 cyl radial for the 87" Stearman I will be starting on shortly.
The aeroworks is just about finished. I still need to do 2 sets of flying wires.
Old 11-15-2019, 01:49 AM
  #3277  
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Thats an awesome overhaul of the aeroworks stearman. I had my first one in one too... theres even a video on Youtube on it somewhere...


Anyways... I bought one for my PZL and it sounds like it is full of sand when running... so, in memoriam engines #1 and #2 and #3, here goes #4...



Big puzzle


Bearnigs completely shot...


and rust everywhere...


Ready to replace with good quality bearings...
Old 11-15-2019, 02:08 AM
  #3278  
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convert it to gas and ignition.....no more Titanic rusticls :-)
Old 11-15-2019, 02:44 AM
  #3279  
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Originally Posted by SJN View Post
convert it to gas and ignition.....no more Titanic rusticls :-)
What, and miss all the disassembly and assembly fun?!

No, honestly, I am not putting Ä700.- or $750.- into this engine for a gas conversion. For that Money I would rather get a used Saito und clean this one every year.
Old 11-15-2019, 03:59 AM
  #3280  
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I agree :-)

Size comparrison , saito 200TI , 84FG, OSFG40, Moki 180, ASP 400


Last edited by SJN; 11-15-2019 at 04:01 AM.
Old 11-15-2019, 11:22 AM
  #3281  
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Smile Great Stuff!

That's not pollution Grassie! That's fresh air! I admire your skills! Thanks for the breakdown photos Reverend. (I hope I don't have to go that far with mine!) I think I've seen most of your videos, and they've been a large part of my decision to own one! Thanks to SJN for the engine porn! That's some COOL collection! I like your background, too! (It reminds me of my shop sometimes!) I found an Aeroworks Stearman NIB on RCG, that's close enough to drive and pick up, if I could only sell a few of my engines in time! The Aeroworks Stearman seems to be the perfect size for the ASP 400. I'm glad this thread is still alive, as I was feeling alone with my choice of this engine. Mine has the CH Ignitions gas conversion and Keleo exhaust ring. I'm leaning towards my 1/3 scale Balsa USA Fly Baby 1B biplane, but I'm wondering if the ASP would have enough power for good flight and basic aerobatics. Pulling a loop from level flight without diving would be nice. No, I'm not a 3D pilot. I prefer more scale-like flying. Anyone tried this combo before? Thanks and Blue Skies guys!

Last edited by SPACE COWBOY; 11-15-2019 at 11:25 AM. Reason: text
Old 11-17-2019, 09:42 PM
  #3282  
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That rust isn't all that bad on the crank, Rev. So did water get in the engine, or just methanol hygroscopic action?

Sonny, you kill me. Good thing you are not married or you would not have so many cool toys!
Old 11-20-2019, 08:46 AM
  #3283  
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Originally Posted by Kmot View Post
Your carb is all wrong. It is missing the correct mounting section, and probably is sucking air and will be hard if not impossible to tune properly. It should like like this:
The gentleman used a photo of a modification I made. I found the carb tuning on my first engine to be very inconsistent. In less than a 1/8 turn of the needle the tune would go from perfect to overly rich. Having a history of racing auto engine development I examined the carb first and found the manufacturing to be questionable. I considered replacing the carb with an OS model but the cost was prohibiting. My next avenue to explore was the intake tract and the first problem to address was the sharp right angle bend. My guess was the atomization was being negated and the droplet size was increasing. After fitting a new homemade straight intake manifold the tuning became much more consistent with improved throttle response and less fuel consumption. The engine also has a CH ignition spark system. Iíve since acquired a second engine and the mod improved it as well. Next I will work on lengthening the manifold and see if any performance gains can be found there.
Old 11-20-2019, 08:59 AM
  #3284  
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Refer to post 3241 for more intake mod photos
Old 11-29-2019, 10:17 PM
  #3285  
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Originally Posted by rfrantz View Post

The gentleman used a photo of a modification I made. I found the carb tuning on my first engine to be very inconsistent. In less than a 1/8 turn of the needle the tune would go from perfect to overly rich. Having a history of racing auto engine development I examined the carb first and found the manufacturing to be questionable. I considered replacing the carb with an OS model but the cost was prohibiting. My next avenue to explore was the intake tract and the first problem to address was the sharp right angle bend. My guess was the atomization was being negated and the droplet size was increasing. After fitting a new homemade straight intake manifold the tuning became much more consistent with improved throttle response and less fuel consumption. The engine also has a CH ignition spark system. Iíve since acquired a second engine and the mod improved it as well. Next I will work on lengthening the manifold and see if any performance gains can be found there.
Apologies! If you have found a better way for your particular engine, that is great!
Old 11-29-2019, 10:36 PM
  #3286  
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Originally Posted by Kmot View Post
That rust isn't all that bad on the crank, Rev. So did water get in the engine, or just methanol hygroscopic action?

Sonny, you kill me. Good thing you are not married or you would not have so many cool toys!
Kmot,
just the usual methanol hygroscopic tragedy. Due to high Workload at my daytime job the engine is still sitting on the workbench, waiting for my TLC.

First snow here so I am not in a hurry...

Rev
Old 12-01-2019, 07:24 AM
  #3287  
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Originally Posted by Kmot View Post
Apologies! If you have found a better way for your particular engine, that is great!
Well thank you, I guess.
Old 12-04-2019, 07:26 AM
  #3288  
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Hello, got my motor running good but from your experience could someone recommend a minimum tank size for the 400, I am looking for at least 5 minutes at mixed throttle. I am using a 20x8 prop getting about 7200 rpm. Thanks
Old 12-04-2019, 08:44 AM
  #3289  
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I believe you would be better off using a larger prop. When your 20x8 unloads in the air your engine will probably rev to over 8,000rpms. I donít believe these engines will live long at that speed. I have flown mine on glow fuel/ glow ignition and glow fuel/ spark ignition in 1/4 Bearcat weighing 22lbs. With a 22x10 wooden Falcon prop it revs to 5,700 on the ground and probably 6,200 6,300 in the air. Iíve flown 7 mins on glow ignition and 10 mins on spark ignition with + - 1/8 left in a 24oz tank flying in a scale like fashion.
Originally Posted by keathebch View Post
Hello, got my motor running good but from your experience could someone recommend a minimum tank size for the 400, I am looking for at least 5 minutes at mixed throttle. I am using a 20x8 prop getting about 7200 rpm. Thanks
Old 12-04-2019, 07:06 PM
  #3290  
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thanks for the information, I agree that's a lot of RPM. this is a new motor I bought in 2010,just now got around to using it. I propped it low to get it running, but if its ok to maiden with a bigger prop I will go up. I am not familiar with 4 stroke glow, but I have followed this thread, or go with something in between? I don't need a lot of power.

/
Old 12-04-2019, 11:36 PM
  #3291  
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Red face ASP 400 Radial prop size?

I've read that a 20x10 was a good prop for them, as well as a 21x8. The only negative thing I can say for most of the videos I've seen is, they don't mention prop size! I'm hoping the sizes I mentioned will work out OK, because I happen to have one of each in stock. I also have several 22-inch props in various pitches, but the engines seem to drop off quite a bit with anything over 21 inches. I just wonder what it translates into, when compared with the two-stroke gas engines that some of us older fliers are more familiar with. As an example: Would it have the power of a Zenoah G-38, Zenoah G-45, or a Zenoah G-62? My guess would be the G-45, just based on prop sizes, but I have no flight history with the ASP-400 AR Radial, so that's pure speculation. Anyone care to venture a guess? I'd like to know what to expect.
Old 12-29-2019, 01:00 AM
  #3292  
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Hi Grassie here. My word! It seems like admin has changed some of the subscription rules as I can not sign in on my account any longer. I had to create a new account to get in. hope admin can correct the problem. Enough of that.
What a lot of parts goes into this little engine! Since Sanye is no more where does one get spares for these engines? Else I need to get my grubby little paws on another engine for spares!
Old 01-01-2020, 02:08 PM
  #3293  
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Talking

Flew my ASP 400 today to celebrate the new year, here is a short video on Youtube: youtu.be/DBECdtgmwqg
I love this engine, so sad they are not made anymore.
Old 01-05-2020, 09:56 PM
  #3294  
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The engine sounds soooo good in flight!
Old 01-05-2020, 09:57 PM
  #3295  
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Originally Posted by Grassie1 View Post
Hi Grassie here. My word! It seems like admin has changed some of the subscription rules as I can not sign in on my account any longer. I had to create a new account to get in. hope admin can correct the problem. Enough of that.
What a lot of parts goes into this little engine! Since Sanye is no more where does one get spares for these engines? Else I need to get my grubby little paws on another engine for spares!
This is a lousy problem we all face now.

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