Hi All:

              While playing with my HP .40 BG equipped Ag Cat, I noticed a problem.  The engine was impossible to start which is strange as it used to be very easy to start.  The only change was that I had added a chip muffler with the muffler pressure line attached to the fuel tank.  I removed the pressure line and it started instantly. While it was running, I attached the muffler pressure line to the fuel tank and the engine stopped.  I am guessing that the muffler is too restrictive producing too much fuel going to the engine. This may explain why the engine and muffler were badly flooded with raw fuel. The muffler has twelve No. 43 holes drilled in it to release the exhaust gases.  Perhaps there needs to be more holes drilled in the muffler.

                                                                                                                                                            Thoughts/suggestions,

   

i ALMOST NEVER  RECOMMEND MUFFLER PRESSURE  on CL stunt  setups, Pressure  makes everything  worse, and makes the  engine dumb  where  it does not respond to attitude  change
If any leaks the become large problem,
 if line slips off  lean motor burn run
if line cloggs  lean motor burn run
line slowly clogs  makes for bad needling
trash burned carbon flake  sand  dirt  etc  can go thru the exhaust and ne put into the tank
you are  filling the tank with  massive bubbles, and  hot gases, and  burned  fuel

there are many more

Randy

ARGH .

But if you get a bullet trough the fuel tank , the inert gasses mean it dosnt explode ! .

Muffler pressure can even the run where the airs really choppy , so the models bouncing all over the place , keeping the fuel up to the motor .

     Hi al.:

     Thanks for all of the replies!

      Rand’s post reflected my thoughts perfectly.  It was suggested that muffler pressure would make an engine run much better.  I have used a straight Uniflow system and never wanted for performance from a fuel system.  Human nature dictates that we attempt to improve our lives in most cases.  At times it may be well hidden.

       Perhaps the idea of pumping dirty used oil into my fuel was the most repugnant. Any way, KISS is a good idea.