High-performance internal combustion engine

A high-performance four-stroke internal combustion engine, including:

• a crankshaft chamber;
• at least two cylinder chambers;
• a crankshaft linkage mechanism, disposed in the crankshaft chamber;
• at least two pistons, connected to the crankshaft linkage mechanism and accommodated in the cylinder chambers;
• an inlet pipe, only communicated with the crankshaft chamber;
• at least two flow guiding pipes, having one end thereof only communicated with the crankshaft chamber and another end thereof only communicated with the cylinder chamber;
• a check valve unit, including a check valve disposed at a connecting location of the inlet pipe and the crankshaft chamber, and at least two first switch valves disposed at connecting locations of the flow guiding pipes and the cylinder chambers, wherein there are two cylinder chambers, there are two pistons, there are two flow guiding pipes and there are two first switch valves, the crankshaft chamber is formed with a left part, a right part, an upper part and a lower part, one of the cylinder chambers is connected to the left part, the other cylinder chamber is connected to the right part, the inlet pipe is connected to the upper part, and the two flow guiding pipes are connected to the lower part, wherein a lubrication oil nozzle is disposed in the inlet pipe and arranged corresponding to an inner chamber of the inlet pipe, and wherein the inner chamber contains a gas mixture of fuel, oil, and air, and in which the gas mixture passes through the crank chamber from the inner chamber and into the two flow guiding pipes in the lower part of the crankshaft chamber.