Exhaust Over Intake (EOI)
Some engines have been made with the reverse configuration, having the exhaust valve in the cylinder head and the intake valve in the block. The ABC Skootamota began production with an engine of this configuration, but this was changed to an overhead valve engine before production ended.
In 1936 and 1937, the Indian Four had the valve positions reversed, with the exhaust valve in the head and the inlet valve in the block. In theory, this would improve fuel vaporization, and the engine was actually more powerful. However, the new system made the cylinder head very hot. The exhaust valve linkage required frequent adjustment. The design was returned to the original IOE configuration in 1938.
Read more about this topic: IOE Engine
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