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  • Sour espresso

    Hi guys,

    Im using the bes920 and is getting some really sour espresso.

    I've tried two blends. One from cafe cherry in Ashfield and another one from Gumption in the strand, sydney Cbd.

    Both coffee tastes really sour by themselves. The Gumption coffee in particular does not have a very strong coffee taste if you know what I mean.

    During brewing I start off with 9.5 then it lowers to around 8 to 8
    5 ish.

    Should I just keep switching coffee? I feel that that may be something that I am doing wrong.

    The beans are all within 1 week of roasting

  • #2
    Have you tried playing with your grind or do you get it pre ground? When the shot pulls through does it look like a full stream similar to honey pouring or more like water gushing through really fast?

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    • #3
      What is your dosing routine? Do you know what the capacity of your portafilter is? How much are you dosing, and what is the extraction time? What yield are you achieving in that extraction time? I suspect its not the coffee, just the dose and grind size. If you nail a 30g (ml) shot in 30 seconds as a ballpark, and its still sour, or unacceptable, then looking into pump pressure and or water temp. What machine are you using?


      Nate

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      • #4
        Thanks guys, Im using roasted coffee beans and gr8nding thrm my self. It's deff not watery and I get around half a layer of crema or caramel layer and half espresso.

        I'm using the 2 shots portafilter so should it not be 60 ml? I think Im getting close to around 50ml. Will measure when I get back.

        Im using the breville dual boiler. Bes920.

        The watertemp is at 93c and pressure is between 8 to 9.5

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        • #5
          If it's a lightly roasted coffee, it can taste sour through an espresso machine. You can turn the brew temp up to 94-95 to try and make it more drinkable but ideally you'd want to change to a darker roast.

          Does it say on the bag that the coffee is for espresso?

          The gauge response from your machine would indicate that the pump pressure is ok.

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          • #6
            Sounds to me like it's under extracted.

            I frequently buy my beans from Gumption (mostly Paracelsus Punch blend), and generally go for a 2:1 Yield to Dose ratio, and it works out pretty well. I use to have a BES920 too.

            I look to dose with 19.5g, and extract ~39g in 25 - 30 seconds.

            I found a set of scales massively increased my consistency

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            • #7
              If you make a video of your entire coffee making routine we might spot something. Otherwise I'm working at Smithfield at the moment and am happy to pop over after work one day if you like. I've been using a BES920 for a couple of years now and am pretty confident with it.
              Last edited by level3ninja; 7 April 2017, 07:02 PM. Reason: Autocorrect

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              • #8
                Has the machine warmed up fully?

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                • #9
                  https://youtu.be/KKhw166vWRk

                  Had to leave the computer on overnight to upload. Upload speed way too slow here.

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                  • #10
                    How many mls did you get from that pour? It didn't look like a lot but could be deceptive.
                    My thoughts was that it seemed to be channeling early as it started to waver very early and become thin.

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                    • #11
                      I thought it was around 60 ml but yesterday night I forgot to measure the espresso before drowning it in milk. So I filled a measuring shot glass with water and poured back into the glass guesstimated the amount of liquid.

                      I'd say it is around 30ml. But will get a more accurate number when I get home from uni today.

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                      • #12
                        Looks like a nice pour - I'd try taking your temp up

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                        • #13
                          ...or try known good coffee from BeanBay...

                          (sorry for the blatant plug but if BeanBay coffee is sour then it's process/equipment and it will help narrow the problem down)

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                          • #14
                            Originally posted by Andy View Post
                            ...or try known good coffee from BeanBay...

                            (sorry for the blatant plug but if BeanBay coffee is sour then it's process/equipment and it will help narrow the problem down)
                            I think you’ve earned the rite to do blatant plugs.

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                            • #15
                              Just measured it. It was around 25ml of espresso + crema in the 30 second.

                              Does that seem a bit too little? should I vary the time or the grind size or the amount?

                              Will deff buy the beans from bean bay after I finish this batch.

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