| 摘要 |
An internal combustion engine (1) having a cylinder block (2) with cylinders (40) with valves (5a, 5b, 6a, 6b) arranged in the roof of the combustion chamber, and piston (4) reciprocable within a liner (19) in the cylinder. The cylinder has a smaller diameter upper portion (20) and a larger diameter lower portion (40B) with a shoulder (34) therebetween. The upper end (44) of the liner (19) abuts the shoulder (34) in the cylinder located substantially level with the upper piston ring (32). The valve seats (17) of corresponding valves (5a, 5b, 6a, 6b) protrude radially of the valve seats into the wall of the upper portion (20) of the cylinder.
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