Is it the case, when the engine comes to a halt, that the cylinder/piston/valve phases always finish up in the same starting or initial position relative to each other?

  • Are you asking if the engine always stops at the same place? (IE: cylinder 1 piston always stops at top dead center) Jan 6 at 13:53
  • Yes, that's another way of asking the question.
    – Jim
    Jan 6 at 14:14

1 Answer 1


No. An engine stops where it stops because it is random when you turn the ignition off, and therefore there is no set place for it to end up at.

  • Right, okay. And presumably the phases remain sync'ed, across starting and stopping the engine. Is that right?
    – Jim
    Jan 6 at 14:25
  • What do you mean by "phases"? Jan 6 at 14:41
  • 2
    They are all connected mechanically, so of course they stay in-sync, in-phase, or whatever you want to call it. Unless something like a timing belt/chain/gear breaks, but that's pathological.
    – mike65535
    Jan 6 at 15:26
  • Ok, Mike65535 answered the question.
    – Jim
    Jan 6 at 16:24
  • 1
    in fact the reason it is called a timing belt is that it keeps the timing in sync.
    – user253751
    Jan 6 at 22:23

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