The four-stage pump has one pressure and three scavenge sections. The pressure section of each feeds oil to the block, while the scavenge sections pull oil from special pickups in the dry sump oil pan. The four-stage dry sump pump is plumbed like the three-stage, but the line from the additional scavenge section can be routed to pull excess oil from the lifter valley. This keeps oil from sloshing around in the top of the engine and running down onto the rotating assembly, reducing windage and increasing horsepower.
Dry sump oiling systems are the safest, most dependable oiling systems available. They