Scavenge side of my oil pump has always worked well, about 1/3 more (give or take) than the oil volume of the feed side is. I always drain the sump if it sits without running for 14 days or more, I got tired of cleaning up the concrete, when the crankcase vent spews it all over the place. I always, (every time I start it) make sure the scavenge return is returning oil to the tank. Besides all that extra oil in the sump, can not be good for the crank shaft having to fight its way through the extra oil. I would think that would be quite a strain on the crank, and timing side white metal bush. No filter in the return side, rely on the gauzes, and 1000 mile oil changes, plus have the really good oil which used to be made by (KENDALL) they sold the original GREEN NON or almost non detergent oil to a company called Brad Penn, they call it a racing oil, it is so low in detergents, it allows the sludge trap to work as it was designed. $ 5.00 bucks US per quart, I buy it by the 12 quart case and glad to get it. It still has 14 to 15 Parts Per Million of the anti scuff zinc for the cam and cam followers, all other manufacturers have reduced this to under 9 PPM because it fouls the catalytic converters in modern cars.
