Spockwerks
NAMAZU Pez de Terremoto
Exactly the one I was referring to, I am glad that someone remembers that anomaly besides me. IIRC it was a reed valve like any 2-stroke of the period, except that it was vented into the sump rather than the atmosphere. And Husky promoted the ambiguity of whether this thing could be said to have a 'pump' or not.The mention of a Husqvarna with no oil pump was a bit wrong. The 510 4/cycle engine used crankcase pressure to force oil up to the top end through a one way valve. Clever and interesting!
I mentioned it in the context of old time racers in search of the last flea power from the XS650/750 engine. Our breather, equipped with a PCV valve could make a functional top end oiler more than similar to the Husqvarna solution except that it would be a constant loss system. Never pass tech inspection which is a shame because done right it could eliminate the oil pump altogether, relying on splash feed for the big end and clutch/gearbox. Power handling would be a major problem.