hmmm very interesting, whats the clearances like on these "scrapers"....seems like all the turbulence may cause them to break or something..i've never heard of it.
Well companies like Jegs and Summit, etc, sell them. There trim to fit so you hafta do some cutting and grinding to fit them. My buddie has one from Milodon in his shop for a SBC and its fairly thick. You just hafta contour the shape to the shape of the rods and crank and such so its close to the rotating assembly but you hafta account for thermal expansion changes but i've seen them pretty close to touching! They usually mount to the oil pan rail. When i worked at Patterson Racing, almost all of there motors are dry sumped super-comp motors, like 60-70,000 dollar motors! They build some of the most winning motors in NHRA. Now in these dry-sump pans were a Stef's windage screen and a small angled piece of aluminum welded to the pans inside edge for a scraper but wasn't contoured to the shape at all. This Stefs screen has a single direction diamond shaped holes that allow oil to whip through it and not come back, think of a cheese grator! No reason we cant applie this to a duramax, even in a wet sump, im sure some folkes have!
Now the bullnoseing and knifeing... Look at an airplanes wing, blunt leading edge, sharp trailing edge. Theres plent of good examples to compare this to as the same principal! I can only speculate but a sharp leading edge would prolly create a more disturbed path of resistance inside and a more rounded would travel smoother and you would want a sharp trailing edge as not to create a vaccum/suction effect behind the weight, as this would defeat the reason of doing it, it would likly pull oil behind it. But anything has to be better than square edges! IMO
