what is a crankcase

A crankcase is the housing or casing in a piston engine that surrounds the crankshaft. It acts as the central structural component of the engine, holding important parts like the crankshaft, pistons, connecting rods, and cylinders together. In modern engines, the crankcase is often integrated into the engine block. The crankcase also usually contains the engine's oil, which lubricates and cools the moving parts to reduce friction and wear. In four-stroke engines, the oil sump is often part of the crankcase, holding most of the engine's oil. In two-stroke engines, the crankcase may serve different functions, such as compressing the fuel/air mixture or providing lubrication. Additionally, the crankcase must be designed to be strong and durable, as it withstands high pressures and stresses generated during engine operation. It also has ventilation mechanisms to allow gases to escape, preventing pressure buildup that could reduce engine efficiency. In summary, the crankcase is a robust and essential component in internal combustion engines that houses and protects the crankshaft and related parts while providing lubrication and structural integrity for the engine.