In my creative setup I just checked if the machine attached to the engine (a bronze crusher) was turning on at all. With a bronze boiler it stayed off, same with 2 invar boilers. With 3 it started doing the animation, meaning it was on. I didn’t actually check if it could actually crush ores, but I assume it could do it.
As I understand it the 50% efficiency of engines means that it has a cycle of push-pull, making the recepies slower and more lossy (because the progress bar goes up only during the push part), but it doesn’t actually cut the output in half.
If it did, even steel engines wouldn’t work (24/2 = 12KU/t, and the minimum required is 16)
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