Jim's opinion: Over loaded crank shafts break and take the engine out in milliseconds. In a 3 main bearing crank with the typical 1342 order (2134 is the same), the front two , then the back two fire. (primarily to avoid rocking couple vibration from front to back), and with a crank that has no counterweights or dampeners, the sranks are robust enough at the rated rpm, and maybe +10%, but real harmonic vibration can become violent enough to shatter iron when specific speeds and power combine to place transient forces at harmonic locations in the crank. have you broken a stick over your knee and had it shatter there, and at some other location sending pieces flying. It is almost certain that the breakage is not related to static loads. Jim just thinking. With support between each cylinder, the harmonics are dampened to the point that the critical energy needed to shatter the iron is out of the range of possible damage. This is basically true until orbital velocities are reached in racing (real racing) engines are built. Jim
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