•  A special cast iron liner-less type cylinder block has been adopted to provide a thin-walled cylinder block. In addition, a curve-shaped, deep-skirt cylinder block has been adopted to heighten the cylinder block rigidity.

•  The engine coolant passage has been equipped by cross-drilling in the bore, improving the cooling performance and reducing oil consumption.

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1	Bore A-A cross-sectional
2	Cross-drilling processing (engine coolant passage)