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Here's a graph of the valve movement at 9,600 rpm with the Endura-Tech springs. The yellow line is the valve's motion at 4,000 rpm for comparison (more or less ideal). The black line is the valve's movement at 9,600, which is the point where the spring reached a significant out-of-control state. Valve float causes the black line to rise above the yellow on the front of the curve. Pushrod deflection is the cause of the black line going below the yellow on the back side. As you can see, there is minimal valve bounce. Lafferty and McCleary stress that they were testing only the springs' ability to live in an out-of-control state in this test (not oscillations or level of control). Amazingly, it survived for over 400 miles without significant degradation of pressures! View Related Article
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