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Cooling flush on a Bezzera Mitica Top

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  • #31
    Originally posted by bigrizz View Post
    Is the boiler nickel plated? It's not stainless steel, right? All the specs I've read say it's copper so guessing the silver colour is a plating?
    AFIK the boilers in all Bezzera's home use machines are nickle-plated copper, yes.

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    • #32
      Originally posted by dumiya View Post
      The brilliance of the HX design is that the movement of the water through the boiler and through the group is controlled so that the temperature is relatively stable. The brass group acts as the fine tuner of the heated water that runs through into the puck. There are a number of controls in place. These can be modified, as in the case of Australia, so the brew water temp is corrected for the beans we use. In AU we require a lower temp. In EU because of different beans their temp is closer to boiling point so a cooling flush is needed to remove any steam. Grey Imports are not set up for AU, so cooling flushes maybe needed.
      My tuppence worth!
      So Australians use different beans? Really? Sorry but I find that hard to believe. Yes, we have a tiny amount of home grown beans but the vast majority of beans are sourced from the same places around the world and roasted using the same machines used in Europe, right? Are you saying that we blend differently in Australia? I find that hard to believe too.

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      • #33
        Hi bigrizz,

        You are right we don't use different beans. We use the same beans as the Italians, Americans, everyone. The big producers are the south American countries.

        What is different here is that our roasting is different. There is a tendency to roast lighter here as compared to the darker Italian style roasts. Different roasts and blends do react differently to different group head temperatures.

        Some of the darker Italian roasts with high Robusta content like a higher temperature, some of the lighter 100% Arabica blends like lower temperatures.

        Although not from an espresso machine a great example is Andys different brew temperature he was using in the Brazen at MICE this year. One was at 92 degrees the other 89 or 90? Andy will correct me if I am wrong. The difference in flavour was pronounced! Both were excellent brews, but the lower temperature sample had a distinctive sweeter taste.

        Cheers
        Antony
        Casa Espresso - Home

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        • #34
          Originally posted by bigrizz View Post
          Yes, definitely warmed up. Generally 30 mins at least. I'm not sure about sour. I thought my shots tasted more acidic, if that's what you mean? My chief tester (wife) thought the same. That's using the same bean going from my Rocket to the BMT. That said, I would still say the shots were good. Just different to my Rocket. I put that down to just not having quite got the machine figured out yet. It took me a while to get to that happy place with the Rocket too.
          Agreed, acidity is not necessarily bad. A certain amount of acidity is actually preferable in a well balanced espresso. There are a lot of factors at play here from temperature to roast.

          It would seem to me that the machine is operating as intended, its just operating at a different temperature giving a different flavour combined with different baskets and dosing requirements.

          Keep at it, I'm sure your not far faraway from getting the best out your new Mitica!

          Cheers

          Antony
          Casa Espresso - Home

          Comment


          • #35
            Originally posted by Casa Espresso View Post
            Hi bigrizz,

            You are right we don't use different beans. We use the same beans as the Italians, Americans, everyone. The big producers are the south American countries.

            What is different here is that our roasting is different. There is a tendency to roast lighter here as compared to the darker Italian style roasts. Different roasts and blends do react differently to different group head temperatures.

            Some of the darker Italian roasts with high Robusta content like a higher temperature, some of the lighter 100% Arabica blends like lower temperatures.

            Although not from an espresso machine a great example is Andys different brew temperature he was using in the Brazen at MICE this year. One was at 92 degrees the other 89 or 90? Andy will correct me if I am wrong. The difference in flavour was pronounced! Both were excellent brews, but the lower temperature sample had a distinctive sweeter taste.
            Aha, gotcha. Thanks for the clarification, Antony. Interesting.

            Comment


            • #36
              Originally posted by bigrizz View Post
              G'day matth3wh. I'm using the stock baskets. Good advice on the dosing. My Rocket would take 22g, which is nowhere near enough for the BMT double basket. I've upped it to 25g and I reckon it's still not quite there as my pucks are still wet. That seems a lot of coffee to me.
              Hi bigrizz... hopefully you're making some progress.

              I'm surprised no one else replied to your 22-25g dose bit. Your stock Bezzera double basket is likely to be 14-16g dose range.

              Are you using a naked/bottomless portafilter or the standard supplied double spouted portafilter?

              Be interested to see a pic or two or even a video of your current steps.

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              • #37
                Originally posted by matth3wh View Post
                Hi bigrizz... hopefully you're making some progress.

                I'm surprised no one else replied to your 22-25g dose bit. Your stock Bezzera double basket is likely to be 14-16g dose range.

                Are you using a naked/bottomless portafilter or the standard supplied double spouted portafilter?

                Be interested to see a pic or two or even a video of your current steps.
                Matt you are right,

                22 - 25gr and still maybe under dosed with the standard baskets. Somethings seems a miss. A pic or video as Matt suggested would help

                Cheers

                Casa Espresso - Home

                Comment


                • #38
                  Originally posted by matth3wh View Post
                  Hi bigrizz... hopefully you're making some progress.

                  I'm surprised no one else replied to your 22-25g dose bit. Your stock Bezzera double basket is likely to be 14-16g dose range.

                  Are you using a naked/bottomless portafilter or the standard supplied double spouted portafilter?

                  Be interested to see a pic or two or even a video of your current steps.
                  Yep, happy to run up a video and post it. May not happen until the weekend though. Weekday mornings at ours are sheer mayhem with two young kids. Thanks matth3wh.

                  Comment


                  • #39
                    I have a Mitica with a vibration pump. In retrospect, I do wish I got a TOP but anyway, it's a fantastic machine! Cooling flush is needed when I go to make the first shot but from shot to shot it's pretty good! Especially when it's paired with my Mazzer Super Jolly. I'm with you Yelta! Although, I do like my VST baskets.

                    Comment


                    • #40
                      Originally posted by readeral View Post
                      Not that I'm weighing into the debate, but just curious - got any photos of insides of these two machines Antony? Curious to know if they have the same internal layout as well. One assumes that the chrome (by that I mean the whole external look) is largely low priority for the R&D budget, and most of the work goes on inside.
                      Hi Al,

                      The ECM with no clothes.

                      Certainly neat and sensible layout.

                      One thing about the ECM rotarys , they are super quiet!

                      Next week i will strip down a Bezzera and we will compare

                      Cheers

                      Antony
                      CASA ESPRESSO
                      Casa Espresso - Home
                      Attached Files

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                      • #41
                        I had a Bezzera Domus Galatea II and now have an Alex Duetto II.

                        I loved the look of the galatea, all the curves etc (subjective of course). I am not sure why, but the finish on the case of the Bezzera looked better than the Alex to me, the shine seemed deeper and more glossy if that makes sense. Also the Bezerra has a thick steel backing behind the faceplate/group and a substantial steel frame. The stiffness of the group was noticeably better (no flex locking in PF) than the Alex. the alex chassis is all stainless but I cant see the powdercoated steel on the bezerra rusting anytime soon, it looked top quality.

                        Both great machines, both have positives and negatives, both make ripper brews. I would imagine this being the case between many machines as you get towards the mid/high end. I doubt one could find any machine without any flaws?

                        Cheers

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