The cylinder block has the following functions: 1. The main functions of the cylinder block are maintaining the engine's stability and lubrication while withstanding a variety of temperatures and loads. 2. Transferring oil to all parts of the engine, lubricating all the critical components, via a number of oil galleries 3. Organizing and determining the position of various parts, 4. Ensuring the standard accuracy of the main components, 5. Accommodating cooling water, adjusting the temperature difference, 6. Placing lubricating oil channels and distributing lubricating oil, the sealing of cylinder block and cylinder head will make the pressure reach the ideal effect, and the power generated by airframe can be transmitted through the follower part.