Quote:
Originally Posted by Jack E/NJ
Pete >>>We do it by hand with a air die grinder and carbide burrs.>>>
If the cylindrical area defined by an open valve and its seat is probably always gonna considerably smaller than the port area, then how much do you really gain by further enlarging the port area?
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A simple analogy might be a river. You gain more usable pressure by damming it rather than having it free flow.
The valve seat is the dam, the port behind it is the lake.
The more surface area in the lake the higher the pressure at the outflow due to atmospheric effect and dead weight of the water. (fuel charge dead weight plus inertia)
How much gain?? If we get to the finish line 1 inch ahead of the next car, we win.