I personaly like a solid, louvered tray. The reason being, is, that, a screen, really doesn't "isolate" the pick-up from windage. Take the age off windage, and we have wind. Its more like a Monsoon/tornado going on in the pan. This can whip up the oil and cause cavitation. Its not so much used to peel oil off a crank, rather to isolate the oil in the sump from the tornado, being created by the spinning crank and rods, which whips up and aereates the oil. With the tray there, it will help to shelter if you will the oil in the sump. A screen, really doesn't do that. It does allow rapid draining, of the oil back into the sump though, which, with a solid tray, can be a problem, which, then, it acts like a big bowl, holding the oil close to the crank, to be picked up by the spinning crank and rods. Thats why a well louvered tray works better. Thats one of the reasons the old Gm corvette type works. If you look at one, it only covers a small amount of the crank, or, more importantly, in the pans they were used in, it shelters the whole sump area, protecting the pick up. Combined with a kicked out pan, and a scraper, to get the oil out of the crank, thats the best set-up for a wet sump pan.
Frank
Advanced Performance
www.get-ap.com