The 6-cylinder engine adopts a Y-type motor distribution structure at both ends, making the whole machine more symmetrical in working force; The machine adopts a host direct connection method, with an energy transmission efficiency of up to 98%, higher than the 93% efficiency of traditional belt transmission; The exhaust separation structure (intake port on the piston, exhaust port on the cylinder head) is adopted to avoid the exhaust temperature affecting the intake temperature and reduce the compression heat balance temperature point ; High-power heat dissipation fan, excellent heat dissipation performance and safer use. The intake and exhaust gas adopt valve group design, which has better sealing, reduces compression heat, reduces leakage, and increases exhaust volume. Applicable to snow machines, small oxygen and nitrogen generators, ozone generators, new energy vehicles, laboratories, instruments and meters, communications industry, food industry, biopharmaceuticals, packaging industry, environmental protection industry, etc.