A round, dome-shaped combustion chamber . This shape permits larger valves and straighter intake and exhaust ports for improved breathing . Its small surface area in comparison to volume reduces the amount of heat loss. It is used in high performance cars and racing engines.
HEMISPHERICAL COMBUSTION CHAMBER
Meaning of HEMISPHERICAL COMBUSTION CHAMBER in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012