Wet sump

ray vinmad

VOC Drawings Manager
VOC Member
The Vincent oil pump must have a running clearance (say 1/2 thou). If that was a gap in your c/case mating faces, you wouldn't suffer from sumping. The oil would be on the floor!
I'm sure sumping is more common now due to the lower viscosity of multigrade oils.
Perhaps more importantly, if the engine hasn't been apart or run since `the old days', running it on modern detergent oils will soon remove all the internal build up of carbon deposits into the oil and grind away all the moving surfaces!
Ray
 
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