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  2. Harley-Davidson Knucklehead engine - Wikipedia

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

    The engine is a two-cylinder, 45 degree, pushrod actuated overhead valve V-twin engine with two valves per cylinder. It was the third basic type of V-Twin engine used by Harley-Davidson, replacing the Flathead-engined VL model in 1936 as HD's top-of-the-line model. The engine was manufactured until 1947 and was replaced by the Panhead engine in ...

  3. 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.

  4. Harley-Davidson engine timeline - Wikipedia

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

    That first engine was a single cylinder model, based on the French developed De Dion-Bouton internal combustion engine. The company was soon fully committed to producing its own proprietary engine designs, and by 1909 the first Harley-Davidson V-Twin engine had been designed and made, setting a template for engine design that continues today.

  5. Big-bang firing order - Wikipedia

    en.wikipedia.org/wiki/Big-bang_firing_order

    A "twingle" is a four-stroke twin-cylinder engine with an altered firing order designed to give power pulses similar to a single-cylinder four-stroke engine. Inline twins with a 360° crankpin offset or flat-twins can be easily converted into twingles by firing both of the cylinders at the same time and installing a camshaft or camshafts that ...

  6. BSA unit twins - Wikipedia

    en.wikipedia.org/wiki/BSA_unit_twins

    The BSA unit twins were a range of unit construction twin-cylinder motorcycles made by the Birmingham Small Arms Company (BSA) and aimed at the US market. A range of 500 cc (31 cu in), 650 cc (40 cu in) and 750 cc (46 cu in) twins were produced between 1962 and 1972, [1] but they were really developments of the older pre-unit A7/A10 model range with less weight. [2]

  7. Straight-twin engine - Wikipedia

    en.wikipedia.org/wiki/Straight-twin_engine

    A straight-twin engine, also known as an inline-twin, vertical-twin, inline-2, or parallel-twin, is a two-cylinder piston engine whose cylinders are arranged in a line along a common crankshaft. Straight-twin engines are primarily used in motorcycles; other uses include automobiles, marine vessels, snowmobiles, jet skis , all-terrain vehicles ...

  8. U engine - Wikipedia

    en.wikipedia.org/wiki/U_engine

    A tandem twin engine, occasionally used in motorcycles and go-karts, is a two-cylinder engine which uses a similar design to U engines. The motor has two crankshafts, [ 12 ] [ 13 ] one for each cylinder [ 14 ] [ 15 ] which are joined and kept in co-ordination by load carrying, crank-phasing gears connecting the two cylinders.

  9. Villiers Engineering - Wikipedia

    en.wikipedia.org/wiki/Villiers_Engineering

    Machinery was installed and training given by Villiers, the first engine, a 125 cc single coming off the production line in September. In 1954 a 197 cc engine was introduced and the following year the factory extended to increase production to 10,000 units per year. [11] 250 and 325 cc twin-cylinder engines were added to the range in 1958. [12]