Harley-Davidson Twin Cam engine

Common card · No. 328422

The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with nearly all previous Harley-Davidson OHV engines. Both engines have two cylinders in a V-twin configuration at 45°, are air-cooled (some touring models use liquid cooling for the heads), and activate valves with push-rods. The crankshafts have a single pin with a knife and fork arrangement for the connecting rods. These are sandwiched between a pair of flywheels. The Twin Cam 88 was a traditional design from Harley-Davidson, as two cams to drive the valvetrain were used before, with the first being the famous '8-Valve' OHV V-twin racing models of 1915. Flathead engines have valves parallel to the piston, there are no additional pushrods, thus they need two matching...

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