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  2. Harley-Davidson Shovelhead engine - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Shovelhead...

    Harley-Davidson Shovelhead engine at the Harley-Davidson Museum. The Shovelhead engine is a motorcycle engine that was produced by Harley-Davidson from 1966 to 1984, built as a successor to the previous Panhead engine. When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and ...

  3. Tuned exhaust - Wikipedia

    en.wikipedia.org/wiki/Tuned_exhaust

    A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.

  4. Harley-Davidson Twin Cam engine - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Twin_Cam...

    Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. 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 ...

  5. Harley-Davidson VRSC - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_VRSC

    The Harley-Davidson VRSC (V-twin racing street custom), or V-Rod, is a line of V-twin cruiser motorcycles made by Harley-Davidson from 2002 until 2017. They are often called muscle bikes for their relatively high power output. The V-Rods are the first street motorcycles made by Harley-Davidson with overhead camshafts and liquid cooling.

  6. Harley-Davidson Milwaukee-Eight engine - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Milwaukee...

    The Harley-Davidson Milwaukee-Eight engine is the ninth generation of "big twin" engines developed by the company, but only Harley's fourth all-new Big Twin in 80 years, first introduced in 2016. These engines differ from the traditional Harley Big Twin engines in that there are four valves per cylinder, totaling eight valves, hence the name.

  7. Expansion chamber - Wikipedia

    en.wikipedia.org/wiki/Expansion_chamber

    When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.