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one-way exhaust valve

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Product Summary

In very early engine designs the one-way exhaust valves were 'upside down' in the block, parallel to the cylinders - the so called L-head engine because of the shape of the cylinder and combustion chamber, also called 'flathead engine' as the top of the cylinder head is flat. Although this design makes for simplified and cheap construction, it has two major drawbacks; the tortuous path followed by the intake charge limits air flow and effectively prevents speeds greater than 2,000-2,500 rpm, and the travels of the exhaust through the block can cause overheating under sustained heavy load. This design evolved into “intake over exhaust”.

In most such designs the camshaft remained relatively near the crankshaft and the valves were operated through pushrods and rocker arms. This led to significant energy losses in the engine, but was simpler, especially in a v engine where one camshaft can actuate the valves for both cylinder banks; for this reason, pushrod engine designs persisted longer in these configurations than others. More modern designs have the camshaft on top of the cylinder head, pushing directly on the valve stem, a system known as overhead camshaft; if there is just one camshaft, this is a single overhead cam or engine.

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