Damn Oil!!

[PK]

Yes, a stickey ring. At idle the ring conforms just fine to the cylinder walls. At higher rpm the ring cannot move in the lands fast enough to seal against compression, resulting in blowby, hence your mess...You could try a flushing agent such as Sea Foam in your crankcase and hope for the best, otherwise a rebuild may be in your future. Sorry.

Scott, you are correct. A sticking ring might need a higher load than idle for it to play up. Possibly even more load than just revving the engine while stationary, so it is hard to test that one.
The Sea Foam treatment could work.

If it's blowby though, isn't the only way that oil could get back up into the intake is if it went through the PCV system? No excess pressure at the oil filler cap would seem to indicate that it's not blowby, although if it was only checked at idle the higher rpm condition described wouldn't have been addressed.

For whatever reason, the PCV systems on individual VX's seem to just be hit or miss as to whether they function correctly. A simple breather filter to replace the PCV valve eliminates even the chance of what's being described as happening though.

If a VX suffers from oil usage because of a problem with the piston rings, oil usage is going to occur anyway, regardless of whether a PCV system is even in place.

Trekky, IIRC there are 3 rings on our pistons.
The top ring seals compression in the cylinders.
The bottom ring controls oil on the cylinder walls.
The middle ring is multipurpose - it does a bit of each.

So, it is possible to have excessive blowby without being an oil burner, and vice-versa.

PK