What is the use of transfer port in engine?

In a two-stroke engine, the transfer port is a passage that connects the crankcase to the cylinder. Its purpose is to transfer the air-fuel mixture from the crankcase to the cylinder during the piston's upward stroke. As the piston moves up, it creates a vacuum in the crankcase, drawing the air-fuel mixture through the transfer port and into the cylinder. The transfer port is usually located in the cylinder wall near the top of the piston.

The timing of the transfer port is critical to the engine's operation. If the port is opened too early, the air-fuel mixture will be lost out the exhaust port. If it is opened too late, the mixture will not have enough time to enter the cylinder and the engine will run lean.

The shape and size of the transfer port also affects the engine's performance. A larger port will allow more air-fuel mixture to enter the cylinder, resulting in more power. However, a larger port can also make the engine more difficult to control.

The transfer port is an important part of the two-stroke engine and its design and timing are critical to the engine's performance.