Hi Steve,

 

Did you install the Andair air/oil separator you bought?  Does it fill with oil immediately?

 

Your engine was rebuilt at the same place as mine.  The crankcase vent fitting just below the oil filler cap on mine nearly dead-ends into one of the intake air runners.  When I tried to run the conventional black rubber vent hose from that fitting, it kinked from the tight bend.  I'm sure you would have noticed it kinked if that were the case on yours, but I thought I'd mention it just in case.  (By the way, I solved the problem by using silicone hose from Spruce, part number 05-00671.  The silicone hose bends tighter without kinking than the rubber hose.)

 

Anyone have a theory why the manometer pressure in the crankcase vent line spikes up (I assume it's reading pressure, not vacuum) when you reduce power in the traffic pattern?  I would expect the pressure to drop, not increase.  But there's a lot I don't know about engines.  Is it because the piston rings momentarily lose their seal against the cylinder walls with the drop of pressure on top of the pistons, allowing blowby?

 

Good luck,

Dennis