Crossword Genius

Rotating device which keeps engines running at a steady speed (8)

Ross

I believe the answer is:

flywheel

(Other definitions for flywheel that I've seen before include "Heavy rotating part of engine" , "Part of machinery that revolves to store kinetic energy" , "Device used to smooth rotational speeds" , "equaliser?" , "Regulator used to smooth the running of a reciprocating engine" .)

I've seen this clue in The Guardian.
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