Technology and Implementation
With the hemispherical combustion chamber design, the intake and exhaust valves are on opposite sides of the chamber, sending the combustion mixture flowing directly across the chamber. This design is commonly referred to as a "cross-flow" head. Significant challenges in the commercialization of engines utilizing hemispherical chambers revolved around the design of the valve actuation, and how to make it effective, efficient, and reliable at an acceptable cost. This complexity was referenced early in Chrysler's development of their 1950s hemi engine: the head was referred to in company advertising as the Double Rocker head.
Read more about this topic: Hemi Engine
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“One can prove or refute anything at all with words. Soon people will perfect language technology to such an extent that they’ll be proving with mathematical precision that twice two is seven.”
—Anton Pavlovich Chekhov (1860–1904)