A lab 4-stroke diesel engine model is a small-scale model of a 4-stroke diesel engine commonly used in trucks, buses, and heavy equipment such as construction machinery and generators. The model is designed to demonstrate the principles of internal combustion engines, such as the intake, compression, combustion, and exhaust processes.

The model typically consists of a cylinder, piston, crankshaft, fuel injection system, and other components. When fuel is injected into the cylinder and ignited, the resulting combustion produces a force that drives the piston and crankshaft, creating rotational motion. The 4-stroke design of the engine means that the combustion process occurs once every two revolutions of the crankshaft, resulting in a smoother and more efficient operation compared to 2-stroke engines.

The lab 4-stroke diesel engine model is commonly used in mechanical engineering and automotive technology courses to teach students about engine design, operation, and maintenance. It may also be used for demonstration purposes in science museums or educational outreach programs.