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Oil Consumption and Breather Tube

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Certified CarbonCubs do also have oil breather tube residue buildup problems. http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB8QFjAA&url=http%3A%2F%2Fwww.cubcrafters.com%2Fpdfs%2Fservice-instructions%2Fsi0023.pdf&ei=nbb8VL_mOZCYyASRi4LACQ&usg=AFQjCNG-auHGEJ1P8RWMG7u73h3aFm7ecg&sig2=ToF55JmeeA4ILEPM_d4uOA

And they don't look to have any valve on the breather tube.
Why put a valve if they don't??

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The way the breather tube is oriented in the exhaust pipe should only create vacuum.

On a single exhaust pipe, why not put a 90 degree bend in to the flow?
 
rocketbob said:
I had a wet vac pump pulling on the breather on my RV-6. I put a flapper-door check valve with one side vented to ambient on the intake side of the pump so that in the event of the pump failure the breather functioned normally. The limiting factor to the system was the fuel pump. Since it is vented to the crankcase, the pump would quit if a high vacuum was pulled. It worked well but I had to dial back the vacuum, using a simple orifice at the inlet of the pump.
Click to expand...

just curious, to equalize the fuel pump couldn't the fuel pump vent be tied into the suction side of the wet vacuum pump so that the delta p would be zero and then the fuel pump would continue to work without limiting the vacuum?
 
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