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    Compression Test

    Good Evening
    Could you please advise the procedure for carrying out a compression test on the stag engine
    Many Thanks
    Frank

    #2
    Frank.
    When I do it, I warm the engine a little bit, then disconnect the +ve lead to the coil. Then remove all the sparking plugs and test the cylinders one by one with the accelerator pedal depressed. The pressure should built to the maximum in around 6 compression strokes. Don't forget to replace the coil lead!
    Mike.

    Comment


      #3
      Thanks Mike
      Could you just confirm you remove all eight spark plugs or just four (one bank)at a time
      Regards
      Frank

      Comment


        #4
        remove all

        Comment


          #5
          Frank.
          As Sujit says, remove them all, which will allow the engine to turn over more freely. Not essential, but kinder on the starter motor.

          Comment


            #6
            Mike. Why depress the accelerator

            Comment


              #7
              Originally posted by Lingen View Post
              Frank.
              When I do it, I warm the engine a little bit, then disconnect the +ve lead to the coil. Then remove all the sparking plugs and test the cylinders one by one with the accelerator pedal depressed. The pressure should built to the maximum in around 6 compression strokes. Don't forget to replace the coil lead!
              Mike.
              +1

              Comment


                #8
                Originally posted by sujitroy View Post
                Mike. Why depress the accelerator
                To allow the engine to breathe fully, and stop inlet vacuum from corrupting the compression readings.

                Also it establishes a "standard" way to compare readings across engines.
                Header tanks - you can't beat a bit of bling.

                Comment


                  #9
                  Sujit.
                  See Wilf's reply!
                  Mike.

                  Comment


                    #10
                    Thanks. Aren't the butterflies in the carbs slightly open enough?

                    Comment


                      #11
                      No. If they were, you would not have plenum vacuum at idle.
                      Header tanks - you can't beat a bit of bling.

                      Comment


                        #12
                        I know I'm going to make myself look even thicker than usual but I've always wondered what 'depressed' means
                        foot on accelerator or foot off accelerator?
                        I genuinely don't know lol

                        Comment


                          #13
                          Foot on i.e. wide open throttle.
                          Header tanks - you can't beat a bit of bling.

                          Comment


                            #14
                            It also has a Covid-related meaning. No wonder English is such a difficult language for others to learn!
                            Mike.

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