Quote:
Originally Posted by Exage
It's most likely the same reason why crankshafts are flexible. It will absorb accelerations better. The same strength crank that is stiff would actually be brittle and problem prone. Engine manufactures can run a flexible crank then a more expensive high strength stiff crank given the design tolerances.
I will say that the crankshafts doesn't have the same flexibility as a wet spaghetti noodle, but it is present and purposely designed into mass produced engines.
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they are flexible because of the nature of the steel. they dont want them flexible. they just dont want them brittle either. you cant have both as far as the materials are concerned. thats why they go through the trouble of forging things and designing structurally sound components. flex in a crankshaft is just robbing power from the motor just like flex in a chassis is adding a vague feeling to the suspension.