Optimist: Flyer with a Fox engine who takes a gallon of fuel to the field. 

I had switched my Ringmaster back to my "trusty" Ceramic fox that had worked very well in a Jamison Special.

As soon as I hit the outside loops it quit. In addition, it ran away lean.  I took the tank, plane and engine to Smith Brother's Hobbies for Tony Naccarato to look at and he could see nothing wrong with my setup.

Anyone with ideas, please do tell! (Not including scrapping the engine, it is a real powerhouse when it runs).

Is this the infamous Fox Burp?!?

Nope, a clean cutoff.

Since the engine was full of grass and who knows what, I tore it down and also really looked at the tank position. 

The spraybar exit hole was who knows where when it was disassembled. It is now 15 deg below the fuel flow where it belongs. The tank was over 1/2" above the engine centerline. Since the engine was running away lean already, this would have aggrivated the situation.

I substituted a hard tank for the Sullivan, and set the pickup level 3/16" above the venturi. I also added foam padding under the tank and will cast an eagle eye to look for fuel foaming. Yes, I do add Armor All to the fuel to kill off foam.

Keep up with the ideas, all are welcome! Foxes really can run well and powerfully, as many Nats winns can attest! I just need to learn how.

This must be a "Chinese" engine............Sum-Ting-Wong. 

Jerry

Yes, it is an L&J Ceramic cylinder engine, and I did check that it has bypass stuffing.

The plug is supposed to be "hot". I am not sure of the source as it was obtained from the estate of Rich Von Lopez.

My current thinking is that I had a combination of bad tank placement (too high) and possible fuel foaming, despite the addition of Armor All to the fuel.

I hope to get out for more testing next week. I now have a hard tank with foam between it and the fuselage. The centerline is now about 3/16' above the venturi.

Yes, I do add Armor All to the fuel to kill off foam.

AH , But DID it kill the Foam ? .

Give it a good shake , and see if it foams .

Herein Terra Australiss , I was told a year or three ago - that " Theyve Changed It , It Doesnt Work . AND Itll form silicone in the fuel & block the spraybar "

Oh Dear . Thought this was drivle , and kept using it , off'n'on. No Worries . Untill ( Jaws Music )  The Nicely Cleaned  NEW Tank , Two Weekends  back I thought It ODD that

THE FUEL STILL FOAMED . Thought it even odder the stringey gunk pouring squeezebottle back into container, and the Lean Speeding Up RUNS. ! 

After this shambles & after a flight last weekend ( New A. All less fuel ) I pulled the filter . At the time I thought it was pva from the ex pva squeeze bottle. Though I used a syringe to Fuel It . 

The Bleedy FILTER was choka ( Full if your being awkward ) With a lump of white stringey gunk . Next Flight it needled FINE .

SO , If your Out of Old Stock Armour All , and theyve ' improved  it ' like here ( Aus. ) youll have to use it on your dash pad , or nylon props . it rejuvinates them . or the old one did , anyway . ( tearing hair out Icon )
Ive used all the stuff I had that worked on the dash pads & plastic .

BUGGER . 

see if the engine  RPMs  drop when you remove the battery, if so the plug is either, not hot, or bad

Randy

About 10 years ago when I first heard of Armour all as an anti-foam agent(surfactant, I think), I decided to try it. That was in my pre-bladder 1/2A days. But I only had Son-of a-Gun, same purpose stuff, and it worked well. I'm very careful not to over do it. I've been using the same bottle for all of those ten years, and a couple of spray shots in a gallon of the 10/22 Powermaster I use in my stunters completely stops foam, even if I shake it like I'm mad at it. I've never fouled a plug or collected goo. It's clean stuff. But I don't know if it's even on the market anymore. Maybe dishwasher anti-spotting agent would work, but I'll let somebody else find out.

Thanks for all the input.

This morning with a metal uniflo tank and the spraybar properly oriented I got in three good flights.  Duration is a bit short, but I am working on that. The lines are just a bit too long, and I can probably go to a 10x6 prop and lower nitro. I only need about 5 more laps for safety sake.

Great, I have some and will give it a shot! Thanks!