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2. Piston ring - Wikipedia

   en.wikipedia.org/wiki/Piston_ring

   Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image. A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are:

3. Break-in (mechanical run-in) - Wikipedia

   en.wikipedia.org/wiki/Break-in_(mechanical_run-in)

   The break-in period required has changed over the years with improved piston ring materials and designs. In reference to small engines, the break-in period now (5–10 hours) is short in comparison with that of engines of the past. Aluminum cylinder bore engine piston rings break-in faster than those used on cast iron cylinder bores. [2]

4. Hercules W-2000 - Wikipedia

   en.wikipedia.org/wiki/Hercules_W-2000

   The Hercules W-2000 is a motorcycle which was made by Hercules in Germany. It was the first production motorcycle with a Wankel engine. [3] [4] [1]: 83 [notes 1]It was designed in the late 1960s, [4] first shown at a German trade show (Internationale Fahrrad und Motorrad-Ausstellung IFMA - the International Bicycle and Motorcycle show [6]) in 1970; the prototype had a Sachs KM-914 engine and a ...

5. Honda NR - Wikipedia

   en.wikipedia.org/wiki/Honda_NR

   This was achieved by designing an oval piston that allowed a total of 8 valves per cylinder, and connecting two con-rods to each piston. Such a configuration led to almost unprecedented complexity in terms of engine design, with 32 valves and eight con-rods incorporated into the dimensions of a regular four-cylinder motorcycle engine. Rear view

6. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   The original Atkinson-cycle piston engine allowed the intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft and was designed to avoid infringing certain patents covering Otto-cycle engines. [4] Due to the unique crankshaft design of the Atkinson, its expansion ratio can differ from ...

7. List of motorcycles by type of engine - Wikipedia

   en.wikipedia.org/wiki/List_of_motorcycles_by...

   A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. In a longitudinal engine configuration, the engine's crankshaft axis is parallel with the direction of travel. However, the description of the orientation of "V" and "flat" motorcycle engines differs from this ...