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  2. Hydraulic clearance - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_clearance

    Pistons: The clearance between the piston and cylinder wall is crucial for preventing leakage and maintaining hydraulic efficiency. A tight clearance minimizes fluid loss, while a clearance that is too small can lead to increased friction and wear. The piston's design and the material used influence the optimal clearance. [2] Hydraulic spool ...

  3. Hypereutectic piston - Wikipedia

    en.wikipedia.org/wiki/Hypereutectic_piston

    [citation needed] As the engine warmed up, the piston expanded and expelled this small amount of fuel which added to the number of unburnt hydrocarbons in the exhaust. By adding silicon to the pistons alloy, the piston expansion was dramatically reduced. This allowed engineers to specify reduced clearance between the piston and the cylinder liner.

  4. Compression ratio - Wikipedia

    en.wikipedia.org/wiki/Compression_ratio

    In piston engines, static compression ratio is determined using the cylinder volume when the piston is at the top and bottom of its travel. The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine .

  5. Subaru EJ engine - Wikipedia

    en.wikipedia.org/wiki/Subaru_EJ_engine

    The thin coating reduces moving friction and reduces cylinder wall scuffing. The piston skirt was reshaped and the piston weight was reduced by approximately 100 g (3.5 oz). Compression ratio was increased to 9.7:1 by reshaping the piston crown. This eliminates the clearance that was available between the piston at TDC and the fully opened valve.

  6. Stroke ratio - Wikipedia

    en.wikipedia.org/wiki/Stroke_ratio

    The Jaguar XK6 engine, used in all 6-cylinder Jaguars from 1949 to 1987 was undersquare. For example, the 4.2 litre engine had a bore and stroke of 92.08 mm × 106 mm (3.63 in × 4.17 in), providing a bore/stroke ratio of 0.869:1. Virtually all piston engines used in military aircraft were long-stroke engines.

  7. Engineering fit - Wikipedia

    en.wikipedia.org/wiki/Engineering_fit

    Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.

  8. Category:Piston engine configurations - Wikipedia

    en.wikipedia.org/wiki/Category:Piston_engine...

    Pages in category "Piston engine configurations" The following 51 pages are in this category, out of 51 total. ... Non-monobloc cylinder block; O. Opposed-piston ...

  9. Squish (piston engine) - Wikipedia

    en.wikipedia.org/wiki/Squish_(piston_engine)

    Squish is an effect in internal combustion engines which creates sudden turbulence of the air-fuel mixture as the piston approaches top dead centre (TDC). [1] [2] In an engine designed to use the squish effect, at top dead centre the piston crown comes very close (typically less than 1 mm [2]) to the cylinder head.

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