That's funny, I did add #6 just now while you posted, See if you are still OK with it. In general, a modern motor does not care if it is loaded or not. Bearings and clearances are much better. Forces are equal at load and no load. Compression is compression. (red line must be respected). The feeling some of us older car nuts have when hearing high revving in neutral is not a good feeling. That's most of it. Racers have no problem with that. Euro's do it right away on high performance cars.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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