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...flows oil to the tappets and crank area simultaneously -- even at idle. Their oil pump has three valves to Harley's two. All three have different cracking pressure (the oil pressure required to open the valves) that regulate the opening and closing of the valves. Once the engine is started, oil goes through the first valve and flows to the tappets. As oil flows and pressure builds, the second valve opens up, allowing precise flow to the crank area. As the pressure keeps building, the third valve regulates oil flow to the crank by either passing relief oil back to the feed side of the pump, or allowing the flow to continue to the crank. A set of high-precision check valve springs controls opening pressures to ensure adequate lubrication through the range of engine operation from idle to full throttle. This produces low-friction operation, successful scavenging of lubricated surfaces, and satisfactory cooling. View Related Article
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