Posted by JMOR on January 09, 2022 at 08:33:08 from (76.187.207.141):
In Reply to: What limits maximum RPM posted by CONSERVATIONMAN on January 08, 2022 at 17:23:45:
In addition to many good responses, you will note that even in 2022, that there are few 4 cylinder engines larger than 2 liters. Reason is that the design is inherently unbalanced and the vibrations will tear a larger engine apart. Keep it slow enough and/or small enough & it will live. The modern 4 cylinder engines have counterbalance crankshafts, and one or two balance shafts & thus will survive the higher rpms. Even some old tractors that were closer to 4+ liters used balance shafts (MF & Ford, for two examples). Yes, I am aware that all tractors are not 4 cylinder engine.
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