Mechanical Mastery
Another first for a domestic production engine with the LS7 is the use of a "dry-sump" oiling system. The front-mounted gerotor oil pump features two stages. The pan is evacuated by the scavenging stage, and the oil is fed to a remote reservoir tank. The reservoir allows a continuous supply to accumulate, and any air is separated, providing the pressure side of the pump with an uninterrupted and reliable source of lubricant under the most demanding driving conditions. This inside view of the sump illustrates the routing, with casting passages directing the scavenged oil flow from the pickup to the scavenge stage of the pump's port at the front of the pan. At the other side of the pan, the oil is routed to an exit at the side from the scavenge stage, and oil is drawn back into the pressure stage via the adjacent passage and supplied to the engine. Slick.
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