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Help! Re: fox glow engine

Post  RknRusty on Tue May 31, 2016 10:15 am

Ken Cook wrote:           ...It wants to snort, fart, and backfire or all of the above. Don't prime through the exhaust with the glow plug clip on, wear a glove when flipping. The engine likes to be wet when starting. Don't be alarmed if fire comes out of  the exhaust port when initially starting.
Lol, no kidding. When I got my first Fox .35 from Cribbs, Ken was most helpful in getting me cranked and running, and then flying. The first time I tried to crank it, the thing slapped the chicken stick out of my hand. I retrieved it and hiked back to the test stand, gave it another flip, and it did it again. I usually refuse to grant respect on demand, but made an exception in this case. I put on heavy leather gloves and got her cranked... until the fuel line vibrated off the nipple. I fixed that, and then it ran till the fuel tank vibrated off its mount. I fixed that, and it ran till the fuel completely foamed. I finally met it halfway, we came to a mutual agreement, and it happily flies my Yak-9.
Rusty

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Help! Re: fox glow engine

Post  Maxdeny on Tue May 31, 2016 6:06 pm

Good news!

I have officially bought the engine for $20 cad!

I had borrowed it from one of the teachers at the local high school to have a look at it and see if it was worth buying and when I went back to buy it he said I could have it for $20

He also gave me a home-made test bench one of the former students must've made before it went into storagefox glow engine - Page 2 P1010516

seems a little sketchy but if it works I think its fine as long as the engine okay

I also installed new black allen head screws on the head and silver screws on the back plate replacing the old stripped phillips head ones plus applied the permatex form a gasket
fox glow engine - Page 2 P1010517
fox glow engine - Page 2 P1010518

all I have to do now is buy some fuel and try it out!Very Happy
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Help! Re: fox glow engine

Post  Oldenginerod on Tue May 31, 2016 7:28 pm

Those Fox twin needle carbs are tricky. You adjust them pretty well opposite to other carbs. I'll dig out some adjustment instructions and post them here.
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Help! Re: fox glow engine

Post  RknRusty on Tue May 31, 2016 8:34 pm

Alright, Max! Get a video camera on that thing if you can.
Rusty

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Help! Re: fox glow engine

Post  Maxdeny on Tue May 31, 2016 10:15 pm

RknRusty wrote:Alright, Max! Get a video camera on that thing if you can.
Rusty

Will do so asap!!
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Help! Re: fox glow engine

Post  Cribbs74 on Tue May 31, 2016 10:42 pm

Make sure you clamp down that test stand very securely. Don't need a trip to the hospital the first time you start it.

Ron
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Help! Re: fox glow engine

Post  fit90 on Wed Jun 01, 2016 4:25 pm

Ditto what Ron said. Be safe and have fun with it.
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Help! Fox 36X

Post  GWILLIEFOX on Sat Jun 18, 2016 9:37 am

This engine was derived from the 36X.  I doesn't have any ball bearings but a single needle bearing in the rear.  The front of the shaft runs in the case material.  This was a VERY successful bearing setup that lasted for over 10 years.  Fox did make a 36 X "Custom fitted for combat" that had a rear ball bearing.

This throttle engine has a THREE needle carb.  A very good carb, but too complicated for most.  A very special version of this engine was for events where no ball or needle bearings were allowed.  Fox made this in single speed and throttled versions.  These used a bronze crankshaft bearing and had a "P" stamped on top of the right mount.  AMA had a Profile Navy Carrier event where the throttled version was used.  Several clubs had combat and racing events where the single speed version was used.

Here's the carb instructions
fox glow engine - Page 2 4a_thr10
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Help! Fox 36X Bronze Main

Post  GWILLIEFOX on Sun Jun 19, 2016 10:03 am

Here is the 1971 36X Profile Carrier Special with the Bronze main.  The "Bronze Main" sticker wasn't permanent and most were lost.  The bronze bushing was a short piece that replaced the needle bearing cage, not a full length piece.  The carb had a larger bore than stock. The "P" can bene seen on the top of the right lug.fox glow engine - Page 2 71-36x10
fox glow engine - Page 2 71-36x11
fox glow engine - Page 2 110a-710
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Help! Fox 36X instructions

Post  GWILLIEFOX on Sun Jun 19, 2016 10:22 am

Here are the instructions for the 1965 36Xs.  Virtually unchanged until they were discontinued in 1972.  The parts for the standard needle bearing engine and for the "fitted for combat" BB engine are shown.

Note on fuels to use, Duke suggested a can of high castor Superfuel for break in then go to Missile Mist (25%nitro, 22% oil) and start adding nitro with Fox Blast.  This was a totally different engine than the stunt 35 and the stunt's castor requirements did not apply.fox glow engine - Page 2 65_36x10
fox glow engine - Page 2 65_36x11
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Help! 36X tilted plug

Post  GWILLIEFOX on Wed Jun 22, 2016 8:56 am

Fox's 1st ad for the new 36X with the tilted plug ran in the Sept. 1964 MAN.  It explained the purpose of the tilt was to allow plug changes on combat models without bumping the leading edge of the wing.  Duke's advertising people got the drawing and airbrushed plug wrong, showing it tilted away from the exhaust.
fox glow engine - Page 2 64090410

In the November ad they got the tilt right:

fox glow engine - Page 2 64110410
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Help! Re: fox glow engine

Post  Maxdeny on Tue Jun 28, 2016 12:33 pm

This is really cool guys!

still having problems with it though

I tried mounting it to a block of wood and the screws still ripped out as well as the thing seems to flood for no reason like way too much gas is going into the engine

there is still hope though as it periodically runs until flooding again
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Help! Re: fox glow engine

Post  pkrankow on Tue Jun 28, 2016 3:48 pm

I have cut a fork in the end of a 2x4 and run very long screws into the wood.  The fork is destroyed after a bit of running and oil soaking, but is pretty good for break in on the bench.

I recently got an aluminum clamp style test stand. Much better and easier to use.

Phil
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Help! Re: fox glow engine

Post  Maxdeny on Tue Jun 28, 2016 5:35 pm

Hopefully longer screws will fix the problem but does anybody know why the thing keeps flooding?
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Help! Re: fox glow engine

Post  Cribbs74 on Tue Jun 28, 2016 10:56 pm

Probably because of the archaic carb. What are you planning on using it on? It might be much easier to just install a CL venturi and needle.

I have heard that Fox carbs do work well, but take some work to set up. Perhaps your fuel delivery system is not set up correctly?

What glow plug are you using?

Do not use soft wood to test a Fox on. Use a piece of hard wood, use through bolts nuts and washers. The test stand must be clamped down hard. Fox engines vibrate badly, be sure your prop is balanced.

Ron
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Help! Re: fox glow engine

Post  Oldenginerod on Wed Jun 29, 2016 2:31 am

Cribbs74 wrote:Probably because of the archaic carb. What are you planning on using it on? It might be much easier to just install a CL venturi and needle.

I have heard that Fox carbs do work well, but take some work to set up. Perhaps your fuel delivery system is not set up correctly?
Ron

It looks like fitting a venturi may be difficult as I think this engine may have one of those "glued in" carbs.  

Max, I looked back at the earlier pictures you posted and it appears that the idle speed screw is missing.  That shouldn't cause the flooding, but will cause problems.  Compare it to the picture that Gwilliefox posted, which clearly shows the two screws at the rear of the carb.  Your RH one isn't there.  Also, the bellcrank connected to the rod to the exhaust baffle is on the wrong way.  Once again, check out the comparative photo below.
fox glow engine - Page 2 6_of_610

Hang on, I just had another look back and it seems that you have changed the position of the bellcrank, but it still shows the stop screw missing.

I would suggest that you screw all three needles fully in and see if you can just get it firing off a few drops of fuel prime.  Then open them all a little at a time until it's clear than fuel is now being drawn in from the tank.  If it does more than just briefly bark on the prime with them all closed, then you might be getting extra fuel from some internal fault.  Make sure you don't have the tip snapped off any of the needles.
Keep persisting.  You'll get it figured out, but you have chosen one of the most confusing carbs in the world to learn on.

Rod.
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Help! Re: fox glow engine

Post  GWILLIEFOX on Wed Jun 29, 2016 10:24 am

Have you tried to set the needles per the instructions? There are 3 to set and you must set them in the order specified. In the picture of the engine on your stand, they look way out; way rich that way!
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Help! Re: fox glow engine

Post  Maxdeny on Wed Jun 29, 2016 6:53 pm

The fuel I'm using is cool power 10% total synthetic

The idle speed needle has a slight wear on it where the gold has worn off but other than that they look good

fox glow engine - Page 2 Img_0010
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I have no idea what the brand the glow plug is as it has no markings on it but I did test it and it works

fox glow engine - Page 2 Img_0012
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I did notice though at full throttle the carb is only half open and I'm mostly sure at full throttle the carb should be fully open so I will be fixing that

Other than that here ore some pictures of my setup as last tested without the engine actually mounted to the wood (waiting for much longer screws)

fox glow engine - Page 2 Img_0014
fox glow engine - Page 2 Img_0015
fox glow engine - Page 2 Img_0016
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fox glow engine - Page 2 Img_0018
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Help! Re: fox glow engine

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