spherical combustion chamber

spherical combustion chamber
The combustion chamber of an internal combustion engine equipped with reciprocating pistons is ideally very compact in design, i.e., without gaps, grooves, edges, etc.; the most favourable design would thus be a sphere but the valves of a four-stroke engine make this impossible. The combustion chamber in diesel engines, however, is located in the piston crown, where it is in fact spherical

Dictionary of automotive terms. 2015.

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