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question: do newer bikes use an asymmetrical valve motion profile, i.e. is the valve acceleration rate greater on the opening ramp than on the closing ramp? I've measured a few older bikes and the motions are symmetrical, but dynamically speaking, you could use a lighter valve spring and probably have a more durable valvetrain if the lift was asymmetrical. From what I understand though, solving for the BC's of a function that gives asymmetrical valve motion is very computationally intense, and I wonder if bikes from the 60's and 70's didn't design cams that way because the time required to design an asymmetrical system would have been too long.
please actual answers from experience or research only, no speculation.
please actual answers from experience or research only, no speculation.