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the crankshaft, not the bearings, although at great enough deflection (i.e. high enough torque levels), that deflection will start to affect the bearings. However, some engines, especially those with long crankshafts that are made from cast iron, can experience torsional harmonics that can and do cause the crankshaft to fracture and catastrophically fail. We just dont see this in our engines. Our engines use a shorter, forged steel crank which is significantly stronger than a cast iron counterpart, more tolerant to deflection, and combined with the firing order's effect on dampening torsional harmonics I think we are just fine running without them.
Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the
tailor.
Albert Einstein
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