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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?

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  • Are you asking if the engine always stops at the same place? (IE: cylinder 1 piston always stops at top dead center)
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jan 6, 2023 at 13:53
  • Yes, that's another way of asking the question.
    – Jim
    Commented Jan 6, 2023 at 14:14

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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.

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  • Right, okay. And presumably the phases remain sync'ed, across starting and stopping the engine. Is that right?
    – Jim
    Commented Jan 6, 2023 at 14:25
  • What do you mean by "phases"?
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jan 6, 2023 at 14:41
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    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
    Commented Jan 6, 2023 at 15:26
  • Ok, Mike65535 answered the question.
    – Jim
    Commented Jan 6, 2023 at 16:24
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    in fact the reason it is called a timing belt is that it keeps the timing in sync.
    – Criticizing Israel not allowed
    Commented Jan 6, 2023 at 22:23

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