bad leak down numbers and oil usage

Rotax Wizard wrote:

Walt, perhaps you have me confused with Sean?

Oil pressure is not what causes crankcase pressure.  It is crankcase pressure that drives the oil return to the oil tank.  The area of the cylinder head does not have any oil pressure.  Once the oil lubricates the rocker arm it is dropped out and loses its pressure for the return via the push rod outer tube into the crankcase.  if the engines internal pressure, created by piston blowdown of pressure past the rings, exceeds the limits then oil can be forced past the umbrella seal into the back side of the valve.  The "leaking" is then caused by this higher pressure.  

Cheers

I ran the crankcase pressure test today, I was not able to achieve 266f oil temperature. On the ramp at 188f oil temp the pressure was 6.3 lbs.