A rotary internal combustion engine without valve train is seeking seed round financing, claiming that its 2-cylinder configuration delivers power equivalent to that of a 4-cylinder engine, and its relevant patent has entered the substantive examination stage.

This project relates to the technical field of internal combustion engines, and is a type of rotary internal combustion engine without a valve train system. An application for invention patent (Patent Application No.: 2026109550368) was filed with the National Intellectual Property Administration on June 30, 2026, and has now entered the substantive examination stage.

At present, internal combustion engines are mainly divided into three categories: reciprocating engines, rotary engines and gas turbine engines.

The reciprocating engine is the most widely used type of engine, with advantages such as good sealing performance, reliable operation and long service life. However, reciprocating engines also have disadvantages including complex structure, large vibration and noise, low effective power, low rotating speed, large size and heavy weight, as well as high production cost. In particular, the existence of the complex valve train system greatly hinders the improvement of effective power and rotating speed. To increase power output of reciprocating engines, manufacturers usually increase the number of engine cylinders, which will further complicate the engine structure, increase frictional resistance, reduce effective power efficiency, raise weight, fuel consumption and production cost.

In order to solve the shortcomings of reciprocating engines, many new types of rotary engines have emerged, represented by the triangular piston rotary engine invented by German engineer Wankel in 1954, which has been mass produced to a certain extent. Although rotary engines have the advantages of small size, light weight, high rotating speed, low vibration and low noise, they also have disadvantages such as more complex structure, poor sealing performance, incomplete combustion, high emission pollution, high fuel consumption, poor low-speed performance and high production cost, which restrict the popularization of rotary engines and make them unable to compete with reciprocating engines in the market.

Although gas turbine engines have the advantages of directly outputting rotary motion, light weight and excellent high-speed performance, they also have disadvantages such as high production cost, extremely high noise, poor low-speed performance and high fuel consumption, which determine that they are only suitable for mechanical devices such as high-speed aircraft, and are not suitable for mechanical devices such as vehicles and ships with relatively low operating speed.

Aiming at the shortcomings existing in the current internal combustion engine technology, this project proposes a rotary internal combustion engine without a valve train system, which perfectly integrates the respective advantages of reciprocating internal combustion engines and rotary internal combustion engines, and overcomes their respective disadvantages at the same time. This project solves the problem of further improving the effective power and rotating speed of internal combustion engines, effectively reduces vibration, noise and fuel consumption, greatly simplifies the structure of internal combustion engines, and significantly reduces the weight, volume and manufacturing cost of internal combustion engines.

This project has the following unique performances and advantages that existing internal combustion engines do not have:

First, without increasing the number of cylinders, the power of the engine can be increased only by adding working cycles (that is, adding air inlets and exhaust ports). When it is impossible to add more working cycles, the power of the engine can also be increased by increasing the number of cylinders. The power output of the 2-cylinder 2-working-cycle engine of this project is equivalent to that of the existing 4-cylinder engine; the power output of the 2-cylinder 4-working-cycle engine is equivalent to that of the existing 8-cylinder engine; the power output of the 4-cylinder 2-working-cycle engine is equivalent to that of the existing 8-cylinder engine; the power output of the 4-cylinder 4-working-cycle engine is equivalent to that of the existing 16-cylinder engine.

Second, it has small size and light weight, with the volume and weight reduced by about 50% to 80% compared with traditional reciprocating engines. The basis is that the power output of the 2-cylinder 2-working-cycle engine of this project is equivalent to that of the existing 4-cylinder engine, and the power output of the 2-cylinder 4-working-cycle engine is equivalent to that of the existing 8-cylinder engine.

Third, the production cost is only 20% to 50% of the production cost of existing reciprocating engines. The basis is that the volume and weight of this project are reduced by about 50% to 80% compared with traditional reciprocating engines.

Fourth, more than two engines can be connected in series, which can easily manufacture engines with larger power, thus saving a lot of time, manufacturing cost and maintenance cost.

Fifth, a clutch is used to control the power connection between the two engines. The power connection is disconnected under congested road conditions, so that only one engine works while the other stops. Under unobstructed road conditions, the two engines are connected for full-power operation, so as to achieve the best fuel efficiency and reduce the user's operating cost.

Sixth, one engine can independently drive one wheel of the vehicle, easily realizing functions such as four-wheel drive, on-site U-turn and sideways parking.

Seventh, due to its small size, light weight, large thrust-to-weight ratio and low manufacturing cost, it can be used as the power source for aerospace vehicles, especially the optimal power source for multi-rotor aircraft, and is the core basic industry of the low-altitude economy.

Eighth, by combining the aerospace vehicle manufactured with this project with a rocket engine, a reusable aerospace vehicle or aerospace vehicle launch platform can be manufactured.

This project can provide power for all kinds of mechanical equipment, and is widely used in many fields such as transportation, aerospace, industry, agriculture and national defense, with a very large market scale. Its production cost is only 20% to 50% of the production cost of existing internal combustion engines. In addition, it can easily realize the unique functions of new energy vehicles such as four-wheel drive, on-site U-turn and sideways parking, so it has strong market competitiveness.

This project is highly consistent with the national policy of vigorously developing the low-altitude economy. Due to its small size and large thrust-to-weight ratio, it is the best choice for the power of low-altitude aircraft. Coupled with its low manufacturing and use cost and simple maintenance, it will become a booster for the future low-altitude economy. It can even be combined with rocket engines to manufacture reusable aerospace vehicles and aerospace vehicle launch platforms to participate in space exploration.