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split dose - do it or not?

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  • #16
    Re: split dose - do it or not?

    Hello,

    robusto: so you polish with the tamper still "pushed" into the PF? I used to do that, but stoped, dont really know why. I will try it out though.

    2mcm: when I overdosed my baskets I got dry pucks, with no holes. I guess it was because when the puck expands it touches the shower screen and its harder for the water to wash away the top of the coffee puck, right?

    About the black flecks, Ive read that this is a sign of good espresso and it is called mottling. Or am I wrong?

    As for the grind setting, if I grind coarser the pour is too fast.

    I will try overdosing.

    Cheers,
    dsc.

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    • #17
      Re: split dose - do it or not?

      Yes, poish with the tamper still inside.

      Theres considerable absorption of water during the extraction. Ive weighed the before/after puck, and the wight of water is relatively huge.

      That absorbed water swells the puck, and it has to have some room to expand, while at the same time providing 9 bar resistance. If the basket is underdosed, its not going to provide that resistance, and not enough essential oils will be extracted.

      Id rather see black flecks than not, providing all other parameters are right.

      -Robusto

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      • #18
        Re: split dose - do it or not?

        Hi Nunu - I have found that in the Rocky the grind is more consistent with the weight of beans behind it - at least an inch or so above the grinding plates.

        Cheers

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        • #19
          Re: split dose - do it or not?

          A little mottling is good....that lots.....my burnt shots come out like that.

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          • #20
            Re: split dose - do it or not?

            Hello

            I made some measurements and found out that 17g of coffee, after tamping, leave around 2mm of space between the coffee cake and the shower screen. This is before brewing. After brewing it almost touches the screen, which is pretty odd, cause it should expand more. Maybe the damn coffee is too old? Had it for around 3 weeks (was roasted on the 27th of february).

            Will do more tests and also I guess I will go back to weighing coffee in the basket. Dosing by volume tends to be imprecise.

            Cheers,
            dsc.

            Comment


            • #21
              Re: split dose - do it or not?

              you want the coffee to be just touching the shower screen when you lock it in.

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              • #22
                Re: split dose - do it or not?

                Ola,

                So today I did the usual, grind some coffee into the basket, distributed and leveled with the rim of the basket. Decided to check how much coffee is inside and it was only 14g. I had to tap the PF on the counter and dose some more to fit 17,5g, the ammount needed to almost touch the shower screen.

                The pour was really slow, but mostly because I used a slightly finer grinder setting. It was dripping for around 10-15s and finally the flow started. It was a bit burned in my opinion cause the whole process took more than 30s and I got less than 60ml from a double.

                More tests to follow, just need some fresh coffee.

                Cheers,
                dsc.

                Comment


                • #23
                  Re: split dose - do it or not?

                  There is a huge overdosing phenomenon in Australia. Im going to experiment with much lower doses such as the nominal 14grams to 15 grams.

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                  • #24
                    Re: split dose - do it or not?

                    Can you point the finger in Paul Bassetts direction, maybe.

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                    • #25
                      Re: split dose - do it or not?

                      hahaha...maybe Ill talk to him about it on Sunday at the VBC

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                      • #26
                        Re: split dose - do it or not?

                        Make sure you ask him about down dosing to get a sweeter shot with lighter roasts.

                        Comment


                        • #27
                          Re: split dose - do it or not?

                          Ola,

                          Ive read in Jim Schulmans paper that overdosing doesnt really do anything good. I mean putting more coffee into the basket doesnt mean that you will get more taste in the cup. The optimum dose was said to be around 14g. Its wierd cause with 14g I get a lot of coffee particles in the cup, they get past the basket holes. Thats why I tried overdosing. I guess it really depends on the machine.

                          Cheers,
                          dsc.

                          Comment


                          • #28
                            Re: split dose - do it or not?

                            Originally posted by dsc link=1173990485/15#26 date=1175541046
                            Ola,

                            Ive read in Jim Schulmans paper that overdosing doesnt really do anything good. I mean putting more coffee into the basket doesnt mean that you will get more taste in the cup. The optimum dose was said to be around 14g.
                            As I understood it, he recommends underdosing for a very specific type of bean and roast style: high grown single origins which are very light roasted. his reasoning includes that with overdosing the result is usually a quite acrid and sour taste - but again only for this type of beans and roast!! He didnt claim it to universal application at all.
                            but I may also be totally wrong with my interpretation - so feel free to shoot me down

                            marco

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                            • #29
                              Re: split dose - do it or not?

                              I find that that what works best for me and my silvia is to grind directly into PF and slightly overfill, bench tap 3 times then level, bench tap again and then wipe ane left over coffee from top of basket level with rim.
                              then temp lightly in centre and then tamp north,south east west with a final tamp of about 15kg in the centre, wipe the rim and insert into machine.

                              this i find lightly touches the shower screen and i end up with a dry puck and really nice coffee(although its taken me a long time to get consistent.

                              My wife had a tupperware party last week and i made 30 cups of coffee in a row most lattes with a couple of long blacks thrown in the middle(good way to bring temp back down after frothing milk)

                              only 1 complaint and that was because i wouldnt go home with her ha ha

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                              • #30
                                Re: split dose - do it or not?

                                whoah 30 coffees in a row with a silvia! thats a fair effort.

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