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"The problem with a crankshaft engine is the maximum pressure occurs when the connecting rod in nearly straight up, and there is very little leverage that can turn the crankshaft."
The only with problem with that is a bit of blow-by and cooling as the piston slowly accelerates. The potential energy of the main charge is not affected, just stored. It might be better to design an engine that holds the combustion chamber volume constant throughout the burn time, but it would be slow and heavy. A regular crank system gives the lowest average acceleration forces on a piston and rod, yet an engine is still more likely to be destroyed by internal inertia forces than combustion pressure.
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