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On thr rotational mass issue, I have been thinking of adding flywheel mass to make the engine smoother at low RPM when used with my torque converter lockup mod, it is a real limitation at the moment, the engine is very rough below 2000 RPM, I want to be able to run it down to 1000 which would mean I could use 1 gear higher around town.
I have heard of people removing the inside valve spring to reduce friction, if you goind all out for economy you will not be using higher RPM where valve float will happen. the Toyota Prius uses a "Atkinson cycle", where the inlet valves are kept open for much longer than normal so the air that is sucked in on the inlet stroke is partially pushed back out on the compression stroke. this reduces the pumping loss, the vacuum the engine has to suck against. in this way the engine behaves like a smaller engine for inlet conditions but a bigger one for the power stroke, it still uses the full power stroke.
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