Stunning & rare Curtiss V-Twin motorcycle engine I saw at a swap meet years ago, circa 1909. This has atmosphere intake valves, with no mechanical linkage to open them. The downward motion of the pistons create negative pressure inside the cylinders, “sucking” the intake valves away from their seats against the pressure of the valve springs. Check out the bellcrank exhaust valve mechanisms. #engineering #engineporn #curtiss #engineer #motorcycle #motorcycles #motorcyclesofinstagram #motorcycleli
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