Moscow inventor Dmitry Toskin has developed an unusual two-stroke internal combustion engine capable of running on several types of fuel at once. The documentation for the unit has been registered in the Rospatent database.
The main feature of the design is a built-in compression ratio regulator. The engineer proposed using a movable piston in the upper part of the cylinder, which changes the volume of the combustion chamber by simple rotation.
The engine casing features markings "B", "K", and "DT" – for gasoline, kerosene, and diesel fuel. The driver or operator can manually select the desired mode. In addition, Toskin simplified the compression ratio adjustment mechanism itself, abandoning complex multi-link drives.
Another feature is the modernized window gas distribution mechanism. The upper transfer ports were shifted higher than the exhaust channel and rotated around the circumference of the cylinder.
Thanks to this, the fuel-air mixture begins to swirl inside the cylinder and less of it goes directly into the exhaust, which is especially important for two-stroke engines.
For starting on kerosene and diesel fuel, the engine received not only a spark plug but also a glow plug. According to the designer's concept, such a scheme could be useful in compact equipment, generators, motor vehicles, and small-scale mechanization.
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