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Imagine how well they could design an engine if it only had to run at one RPM and load regardless of power train demands. Much easier than trying to make an engine run efficiently at all loads.
One size fits all loads will always be a huge stumbling block for engine design. It should be one RPM, one specific load, then you could redesign every component for that load and RPM. Lighter pistons, rods, crankshaft (if it had one), valves (if it had them), bore to stroke ratio could be 1 to 2 or 3 or even more. No throttle restriction, only a fixed amount of fuel delivery.
It will happen when they realize that there are alternatives to connecting the engine-motor directly to the wheels.
regards
Mech
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