The pump is designed to supercharge the inlet side with oil that comes from the pressure relief plunger. When the pressure relief spring begins to open it helps feed the rotor more oil and hold ...

2. Rotor-Type Oil Pump: Many engines are equipped with rotor type oil pump. It has a central rotor with outer lobes which continuously rotates inside the outer ring having internal lobes.

The fin­ished powerplant is much more like a set of siamese twins than a single 4-Rotor engine. They share a common oil pump, submerged in a single sump, and a com­mon water pump, but each has ...