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  2. Piston ring - Wikipedia

    en.wikipedia.org/wiki/Piston_ring

    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: Sealing the combustion chamber so that there is minimal loss of gases to the crank case.

  3. Cylinder (engine) - Wikipedia

    en.wikipedia.org/wiki/Cylinder_(engine)

    A piston is seated inside each cylinder by several metal piston rings, [1] which also provide seals for compression and the lubricating oil. The piston rings do not actually touch the cylinder walls, instead they ride on a thin layer of lubricating oil.

  4. Chrysler PowerTech engine - Wikipedia

    en.wikipedia.org/wiki/Chrysler_PowerTech_engine

    Piston Ring Side Clearance Top Compression Ring 0.0020-0.0037 in. (0.051-0.094 mm) Second Compression Ring 0.0016-0.0031 in. (0.040-0.080 mm) Oil Control Ring

  5. Two-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_engine

    However, a mechanical limit exists to the width of a single exhaust port, at about 62% of the bore diameter for reasonable piston ring life. Beyond this, the piston rings bulge into the exhaust port and wear quickly. A maximum 70% of bore width is possible in racing engines, where rings are changed every few races.

  6. Stroke ratio - Wikipedia

    en.wikipedia.org/wiki/Stroke_ratio

    An engine is described as undersquare or long-stroke if its cylinders have a smaller bore (width, diameter) than its stroke (length of piston travel) - giving a ratio value of less than 1:1. At a given engine speed, a longer stroke increases engine friction and increases stress on the crankshaft due to the higher peak piston acceleration.

  7. Engine configuration - Wikipedia

    en.wikipedia.org/wiki/Engine_configuration

    The crankshaft configuration varies amongst opposed-engine designs. One layout has a flat/boxer engine at its center and adds an additional opposed-piston to each end so there are two pistons per cylinder on each side. An X engine is essentially two V engines joined by a common crankshaft. A majority of these were existing V-12 engines ...

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