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Does 9 bar really matter?

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  • Does 9 bar really matter?

    9 bar seems to be the figure that is said to be the standard for pulling shots, but I cant seem to get it.
    Mine (Isomac Tea) pulls the best tasting coffee at around 11-12 bar. If I change the grind and/or tamper a little less to reduce pressure the flow is too fast and doesnt taste good. So if in getting the best at 12 is that wrong or bad?
    How do I get a good shot at 9bar?

  • #2
    Re: Does 9 bar really matter?

    Originally posted by 020D3532322139400 link=1329083667/0#0 date=1329083667
    How do I get a good shot at 9bar?
    You will need to have the OPV set to 9 bar and then adjust grind to suit the new settings. Ideally, a Scace device is the best tool to set the OPV.

    Cheers

    Chris

    Comment


    • #3
      Re: Does 9 bar really matter?

      Originally posted by 6C595453677B575E5E5D5D380 link=1329083667/1#1 date=1329084606
      Originally posted by 020D3532322139400 link=1329083667/0#0 date=1329083667
      How do I get a good shot at 9bar?
      You will need to have the OPV set to 9 bar and then adjust grind to suit the new settings. Ideally, a Scace device is the best tool to set the OPV.

      Cheers

      Chris
      Would it be beneficial to do this? Would a good shot at 9 bar taste considerably better than BMBeanz good shots at 12 bar?

      Comment


      • #4
        Re: Does 9 bar really matter?

        I have had a thought (after reading other peoples thiughts..)
        When I pull the lever, pressure rises on the gauge,is the reading taken at the point of extraction? If so it hits 9 or so then jumps up, which makes sense as by the time the shot is being extracted pressure would then increase? Or will it decrease as the shot is poured? Im just trying to figure out when the pressure is taken and if its suppose to hold at 9 for the duration of the shot?

        Comment


        • #5
          Re: Does 9 bar really matter?

          This has been discussed a lot on the Breville Dual Boiler thread as the first batch came out with OPV adjusted higher than advertised, with most first batch machines being up around 12 instead of 9. Breville rectified the situation with free adjustments to 9 bar.

          The issue is a 9 bar extraction on a system set to 12 bar will not be a good shot - fast, watery and not flavoursome as BMBeanz notes. You will get better shots by sticking to the 25-30 sec ballpark for a shot (adjusted to your personal tastes) which will extract at a pressure at or near the set pressure of your system.

          It is the system which needs to be adjusted to 9 bar, and then adjust your grind, dose, tamp to get somewhere near 25-30 sec shots (adjusted for your personal tastes). This is what Chris (Talk Coffee) is talking about above. You will then be getting great shots.

          Now, as discussed a lot in the Breville thread, pressure is not as big a factor in espresso making as other variables - such as beans, grind etc. However it does make a difference, just not a big difference.

          Originally posted by 6B645C5B5B4850290 link=1329083667/3#3 date=1329093494
          When I pull the lever, pressure rises on the gauge,is the reading taken at the point of extraction? If so it hits 9 or so then jumps up, which makes sense as by the time the shot is being extracted pressure would then increase? Or will it decrease as the shot is poured? Im just trying to figure out when the pressure is taken and if its suppose to hold at 9 for the duration of the shot?
          A well made shot will hold at the same pressure throughout extraction. The more poor the technique, the more the pressure will drop throughout the pour as the water finds quicker paths through the puck - that is, chanelling. A good technique, with good beans and grind will hold a stable pressure throughout the pour.

          The pressure should steadily rise until it is at or near the pressure of the system and then hold reasonably steady.

          Comment


          • #6
            Re: Does 9 bar really matter?

            Ok so if the valve is adjusted so that it opens earlier it should be better. Relaxing spring tension should allow the valve to open earlier ie 9bar.

            Comment


            • #7
              Re: Does 9 bar really matter?

              Yes, but you really should fit a guage to the group handle so you know what the pressure is being set to (and how it compares with the guage on your machine).

              Ie 9bar at the group might be 10bar on your machines guage.

              Cheers

              Comment


              • #8
                Re: Does 9 bar really matter?

                Ok. Thanks. Ill try and source one.

                Comment


                • #9
                  Re: Does 9 bar really matter?

                  Originally posted by 4D427A7D7D6E760F0 link=1329083667/7#7 date=1329109193
                  Reply #7 - Today at 3:59pm Mark & Quote Quote
                  Ok. Thanks. Ill try and source one.

                  Here you go. http://coffeesnobs.com.au/YaBB.pl?num=1253305789

                  Steve

                  Comment


                  • #10
                    Re: Does 9 bar really matter?

                    Thanks. You guys are on the ball!

                    Comment


                    • #11
                      Re: Does 9 bar really matter?

                      Im in the queue for the guage. Im looking forward to the difference and will post once done.

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