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Author Topic: M91 water cooled vertical H&M. A recap.  (Read 2099 times)

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Re: M91 water cooled vertical H&M. A recap.
« on: July 17, 2021, 07:13:15 pm »
The cheaters way to model how decking the piston will behave is simply to try running it with a very loose spark plug. A little leaking compression to give you a clue.  I’d run it first and loosen the plug once warm, so it starts easier, and see how it acts.