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COMpound Geometry,
in cylinder heads refers to the tilting of the valves on more than 1
axis. Here, each valve is tilted on 2 axis` to illustrate the 3rd
angle that develops. Each is laid over 2 degrees, on the X-Axis
(length of head), and the Y-Axis (width of head), to create a third
angle which is "compound" to the preceding two.
Rocker arms must be laid over to accompanying angles that provide
the roller sits flat atop the valve stem, while still positioning
the push-rod at a compatible angle so the side thrust are minimal.
Unfortunately, this fails on most designs. Which is why we change
it.
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