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I wonder if anyone has ever rigged up a flow bench with a way to open and close the valves at the same types of speeds you'd see in a motor. Perhaps with a way to rig a cam up to a motor and actuate a valve. It would at least provide a better simulation of the stop-start harmonics.
Although I guess it really wouldn't be that much better than checking static flow at a fixed opening. You don't have the varying pressure and shock waves from the piston slamming up next to the head.
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I'm JohnMc, and I approved this message.
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