(1) Hemispherical combustion chamber
The hemispherical combustion chamber has a compact structure, the spark plug is arranged in the center of the combustion chamber, and the flame travel is short, so the combustion rate is high, the heat dissipation is small, and the thermal efficiency is high. This combustion chamber structure also allows the valves to be arranged in two rows, and the intake port diameter is larger, so the charging efficiency is higher. Although it makes the valve mechanism more complicated, it is beneficial to exhaust purification and is widely used in car engines.
(2) Wedge-shaped combustion chamber
The wedge-shaped combustion chamber has a simple and compact structure, a small heat dissipation area, and small heat loss. It can ensure that the mixture forms a good vortex motion during the compression stroke, which is beneficial to improving the mixing quality of the mixture. The intake resistance is small and the charging efficiency is improved. The valves are arranged in a row, which makes the valve mechanism simple, but the spark plug is placed at the top of the wedge-shaped combustion chamber, and the flame propagation distance is longer. The Cherokee car engine uses this type of combustion chamber.
(3) Basin-shaped combustion chamber
The basin-shaped combustion chamber has good cylinder head processability and low manufacturing cost, but because the valve diameter is easily limited, the intake and exhaust effects are worse than those of the hemispherical combustion chamber. Jetta car engines and Audi car engines use basin-shaped combustion chambers.
