crankcase breather

[trevinoz]

Strange that it didn't work, Brian. That is exactly how the breather system works on the Norton twin engine.

Trev.

[Brian]

I did a similar thing to a plunger and it did seem to work ok. On the plunger I put a metal tube up through the bottom of the oil tank so it went almost to the top of the tank and then connected the breather to that.

On the s/arm model I put the fitting in the top of the oil tank but it didnt work. Could be the s/arm model had a lot further and higher to push the oil compared to the plunger.

The s/arm one breathed into the tank ok but it must have increased the crankcase pressure enough to start oil leaks.

It was never a big problem but occasionaly if I pulled up on someones nice clean driveway it would drop one or two drops of oil from the breather and I wanted to try and stop that.

[muskrat]

I use a Bunn breather on the cafe. The motor breaths in yia the rocker box and out via the crank case hole to the oil tank then to atmosphere. A one way valve if fitted at each end. No gasses stay in the motor and it revs quicker. I have disabled the timed breather by cutting it off at the holes so gas can escape at any time.
Cheers