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I did not read all responses, sorry. I think the most interesting part of this is, could this store some of the combustion energy and release it when it will do the most good, i.e. when the conrod is at or very near to 90deg to the crank.
The two biggest drawbacks would be: can a conrod be designed like this and still be reliable, also, will a spring wear out too fast to be feasible. Perhaps an air "spring".
Yes, heat will be generated bit perhaps it can outweigh those losses by providing more force to the crank when the multiplying effect is the largest (angle).
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