somebody correct me if i'm wrong but as i understand it there should be plenty of oil (if u have enough enough pressure) dripping down on the crank from above. any oil coming up from below is just going to create drag which will put a slowing force on the rotation of the crankshaft robbing power. pro's would be decreased drag and the oil pump shouldn't get starved. no real con's to think of. now if u really wanna go top notch (and spend some bucks) you go with a dry sump set up. which stores all the oil in a seperate tank and allows the oil pan to really be small. just enough to clear everything and give the dripping oil somewhere to drain to.
All of the important areas (bearing journals) of the crank are force oiled. There aren't really any cons that I can think of in a modern engine. In older pushrod engines with flat tappet camshafts (non-roller) sling off of the crank is what lubed the cam.
Not to hijack the thread, but has anyone priced out a dry-sump system for the 4.6?
SOLD 1996 4.6l Thunderbird-(fast) PI intake, custom exhaust, Bullet-Resistant Tranny™, blah, blah, blah 2007 VW GTI-(faster) United Grey, 18" wheels, APR stage 1 chip, and... uh... that's it for now.
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Ok, lets take this one step further -- Would a canton windage tray provide enough benefit over the fins in the bottom of a DOHC (Mark 8) oil pan to justify installing? I know that you can't use the tray if the fins aren't ground down, and I'm wondering if it is even worth my time to worry about.