The invention relates to a four-
stroke layered double-swirling
combustion energy-saving internal-
combustion engine with a new air distribution mechanism, and is particularly suitable for various internal-
combustion engines for seas, land and space. A cylinder (28) and a cylinder oil
nozzle gasket (32) are arranged on a
crankcase (85) of a conventional four-
stroke single-cylinder
gasoline rod ejector, the new air distribution mechanism is arranged in a small
cylinder head (12), and a small cylinder (40) is arranged inversely. The front of the wall of the small cylinder (40) is provided with two ports (34), and a small
piston (38) slides up and down to suck air and exhaust air. The sucked air rotationally enters along the walls of the big cylinder (28) and the small cylinder (40), the inlet
fuel oil rotationally enters, the big and the small pistons apply work at the same time, and the exhausted air pushes a suction-exhaust
turbine (51) to apply first work. The internal-combustion engine has the advantages of simple structure, good lubricating condition, long service life, stable work, high revolution rate and no
noise; and the engine realizes layered double-swirling combustion of the
fuel oil swirled in the middle of an hot air interlayer, and realizes three-time work application in one-time combustion, so that the engine has higher high-
power output, saves the
fuel oil by about 50 percent and reduces the emission by 85 percent.