Quote:
Originally Posted by Bicycle Bob
It might be worth while to use some cylinders as steam engines at cruise power, and only burn fuel in them for maximum output. It is probably better than just turning them off with the piston still moving, as is sometimes done.
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On some of the cylinder deactivation engines all the valves stay closed in that cylinder, too. So only a very small portion of energy is lost from pressurizing and depressurizing the air. Sort of like an air trampoline for that piston.