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Can someone please explian the advantages/disadvantages of these things? I have read up on them a little. but I didn't understand completely. 
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Engine oil is pumped to the crankshaft main bearings and rod bearings. As the oil leaves these bearings it tends to get whipped up in the whirlwind the crank is making. This slows its return to the sump, increasing the risk that the pump will suck some air. In addition, the crank is actually using a significant amount of power to maintain this oily hurricane. Enter the scraper.
A scraper is usually a flat piece of thickish sheetmetal with one lengthwise edge cut to fit the rotating profile of the crankshaft. The other edge is often mounted between the pan and the block. As the crank passes, the oil it spins off is stopped by the scraper and returns to the sump. The crank doesn't actually touch the scraper though it does come quite close.
Pros and cons? I dunno. I used one about 25 years ago, I changed so many other things at the time, I don't know if it made a difference. Theoretically it should, but as it is sometimes said, "In theory, theory and practice are the same, in practice they are often not."
Hope it helps,
sg99He who dies with the most toys is still dead. -
Hey thanks smileyguy that clears most of it up. I like your "theory" explanation. LMAO
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