This mod gives you regulated fuel delivery for any attitude and/or through out an entire tank.
Where to get the mod done, email or call James, details at:
http://www.oneals.com
The company that make the regulator (square thing attached to the carb):
http://www.billsroom.com/pcfs/
Note that this mod also works well with the OS 91HZ
OS91 Carb with cline regulator attached and internal carb mod #1
OS91 Carb with cline regulator attached and internal carb mod #1
Tapped Backplate mod for pressure
Well I did end up fliying for a brief moment today in between showers, all be it very windy. Turns out my tank is leaking quite badly due to the stupid second stopper in the middle of the tank.
Time for a mod…
I drilled a hole in the stopper and placed a 3mm button head screw and washer. On the inside another washer and nylock nut. I also used an old o-ring from a old 91 carb base and placed it on the outter side of the the stopper. I guess I’ll find out if it works next flight.
After 50 or so flights I noticed engine running lean and fuel dripping from the tank. As it turned out I had a crack in the fuel tank around the fuel stopper hole. The problem was when the tank is under pressure (it’s a lot as I’m running a OMI Cline carb mod) and expaning it caused the plastic fuel stopper cap to press against the top engine mount bolt. In turn the fuel stopper hole is levered and all the engine mount vibrations where going into the fuel stopper hole. Obviously the tank eventually gave out and broke. You can see from the picture of the tank below which I epoxyed where the crack developed.
A simple solution to the problem is to swap out the offending engine mount bolt with a 4mm rounded head bolt. The fuel stopper cap then easily clears the bolt when the tank is pressurised.
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