YC is Yuchai engine, CA is short for FAW, WP is Wei Chai, and DL is really unclear. ISBE is the familiar engine of Cummins. IS is an interactive electronic control system, B is Cummins B-series engine, and E is Europe (generally lowercase), indicating the engine designed according to European emission standards. There will be other numbers later, such as 2 10-30, indicating that the engine has 2 10 horsepower, which is in line with the European emission regulation No.3.