The layered combustion system of spirally inlet air for vehicle gasoline engine relates to the combustion system for gasoline engines. It consists of a branched double layered inlet pipe (hereinafter abbreviated as double layered inlet pipe), a double layered spinal inlet duct, a conventional vehicle carburettor, a conventional sparking plug and a combustion chamber aranged over the piston. According to the invention, the conventional fuel-supplying system, such as carburettor and so on may be used for replacing high-pressure gasoline-spraying system and thereby a layered combustion system is formed for increasing compression ratio, lowering specific oil consumption and decreasing main harmful components in the exhaust. It is suitable for vehicle gasoline engine with various power and rotational speed. |