Quote:
Originally Posted by pavulon
I remember reading about weber carbs not happily accepting a certain amount of valve train lift overlap
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It’s not overlap per se, it’s the cam holding the intake valve open when the piston starts to move up in the cylinder. The cam timing and length of the intake track are tuned to provide max power/torque at specific rpms. At certain rpm this produces positive pressure in the i tack track at other rpm.