Nivona NICR 820 - Typ 709 CafeRomatica - Weak Taste, Cold Coffee, Thin Crema

    • Yes, we asked for a video and got one :)
      Now about your thread title:Weak Taste, Cold Coffee, Thin Crema

      Weak Taste:
      sb_NUE has informed you that the grinding level does not appear to be optimal - if this cannot be improved further, the grinding stones may be worn out (how many covers does the machine have on this grinder ?)

      Cold Coffee:
      With this small quantity, the coffee is inevitably cold, as the "few drops" of liquid are immediately cooled by the "giant cup".

      Thin Crema:
      For such a small amount of grinding (3 beans) in conjunction with the grinding level described above and the small reference amount, the crema in the video is rather a lot and not a little!
      Immer logisch und Schritt für Schritt vorgehen. Blinder Aktionismus kostet Zeit und Geld.
      Küche: Jura GIGA 5 Pianoblack-Chrom Bj: 2012
      Büro: [sJura GIGA X3 ALU Bj: 2014

    • And he also wrote, that if he uses 11 to 12 grams of coffee, the connection between the drain valve and the brewing unit opens.
      And that was what I expected to see or at least hear in the video.

      If you do a Ristretto, better use the correct cup and preheat it with hot water.
      Kontakt: sb_NUE ät stephanb.net

    • sb_NUE schrieb:

      And he also wrote, that if he uses 11 to 12 grams of coffee, the connection between the drain valve and the brewing unit opens.

      Then the mechanics of the brewing unit could have too much play and at a certain pressure or at a certain amount of powder the brewing unit pushes out of the drainage valve. Then you have to try to rework the brewing unit or replace it completely - for this it would be practical to try out a test brewing unit from another machine to see if the same problem occurs.
      Immer logisch und Schritt für Schritt vorgehen. Blinder Aktionismus kostet Zeit und Geld.
      Küche: Jura GIGA 5 Pianoblack-Chrom Bj: 2012
      Büro: [sJura GIGA X3 ALU Bj: 2014

    • I understood you want to see a video of a standard brewing procedure. You asked for the video before I did and mentioned the test with preground coffee. The cup was preheated, I always do that. I didn't know there was a relation between cup size and amount of crema.

      I wouldn't really consider the test with preground coffee (and the opening of the drainage valve during it) relevant as it happened with much finer grind than what the machine itself can produce (and is therefore supposed to work with) as well as with higher amount of coffee. I think the drainage valve acted as safety valve since the powder puck had too much flow resistance, so it was opened by overpressure.

      I usually brew ristretto lately (and I also did that in the video) because it has significantly less "bad" flavours which are covering the "good" flavours than espresso. The cup is always preheated with boiling water first so I see no issue there regarding possible temperature reduction, no matter how big the cup is.

      I adjusted the grinder as soon as sb_NUE adviced that. There was no significant improvement. What do you mean with how many covers does the grinder have?

      Increasing strenght (number of beans) doesn't improve the flavours either, it just makes the coffee stronger/heavier.

      I made another video, I tried to reflect your remarks. The glass is preheated.
      youtube.com/shorts/Ubpvj_VNuPo?si=4vt--Tozd8pEBrGp

      Dieser Beitrag wurde bereits 1 mal editiert, zuletzt von vit ()

    • I think it was a google translation fault.
      Cover should mean the number of coffees brewed by the machine.

      What manufacturer and what variety of coffee do you use?
      Immer logisch und Schritt für Schritt vorgehen. Blinder Aktionismus kostet Zeit und Geld.
      Küche: Jura GIGA 5 Pianoblack-Chrom Bj: 2012
      Büro: [sJura GIGA X3 ALU Bj: 2014

    • It has done around 5700 cups.

      Most of the time we get coffee from local roasters, we are alternaning between ca. 5 types. All of them are light roasts. When we can't get anything local, we get some light roasts from Tchibo such as this one.

      I can't get rid of the feeling that the grinder stones are worn out. There are really big pieces in the puck, see yourselves.

      Before buy another machine, I'd like to try changing the stones. Do I need to buy ones for Nivona? There are spare parts for other brands such as Miele or Saeco which are cheaper and easier to get. They look identical.

      Thanks!
      Bilder

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    • Doesn't look too coarse to me to be honest.
      But you could disassemble the grinder and check if the stones have any obvious damage.

      You can't replace the stones of this grinder as there are simply none available on the market.
      Only option is buying a completely new grinder.
      Kontakt: sb_NUE ät stephanb.net
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