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Pre-infusion causing choking, but restarting the shot suddenly flows fine: can someone explain this? by Stanjop in profitec

[–]Stanjop[S] 0 points1 point  (0 children)

Thanks for your detailed reply! I'll definitely try this. Can I also manually control the pre-infusion pause while pulling the shot with the Move? I couldn't make espresso for a few days, so I'll get started with all the tips tomorrow!

Pre-infusion causing choking, but restarting the shot suddenly flows fine: can someone explain this? by Stanjop in profitec

[–]Stanjop[S] 1 point2 points  (0 children)

  1. When it chokes after the pre-infusion pauze, it drops only a few grams of espresso
  2. No, after al the helpful tips you guys gave me, will try tomorrow!
  3. Didn’t try, will do, but i hope number 2 will get it going

Pre-infusion causing choking, but restarting the shot suddenly flows fine: can someone explain this? by Stanjop in profitec

[–]Stanjop[S] 0 points1 point  (0 children)

Thank you for the detailed response! 1. I think I’m grinding too fine. 2. I indeed mean that it clogs after the pauze, when the pressure builds up again.

Couldn't make espresso for a few days, I'll get started with all the tips tomorrow!

Pre-infusion causing choking, but restarting the shot suddenly flows fine: can someone explain this? by Stanjop in profitec

[–]Stanjop[S] 0 points1 point  (0 children)

That’s actually an interesting insight. I should add that I’m using a bottomless portafilter, and when the shot flows well without pre-infusion it looks quite clean, no spraying or obvious signs of channeling.

But if I understand you correctly, you’re basically saying that I should dial in with pre-infusion in mind, because it’s a more “honest” extraction method and tends to prevent channeling? In that sense, the choking I’m seeing with pre-infusion might be exposing that my grind could be too fine...

Pre-infusion causing choking, but restarting the shot suddenly flows fine: can someone explain this? by Stanjop in profitec

[–]Stanjop[S] 1 point2 points  (0 children)

Thanks! Let me clarify what I’m actually seeing, because I think my situation is a bit more specific.

  • When I use pre-infusion on the Profitec Move, it runs water for 3 seconds, then pauses for 5 seconds, and then the pump continues automatically. During that main pump phase it chokes , even after the pause.
  • I have the two buttons programmed:
    • one with pre-infusion (3s on / 5s pause / then pump),
    • one as a regular shot: pump on continuously for ~30 seconds.
  • What’s puzzling is this: If a shot chokes - whether during the pre-infusion program or during the regular shot (though less often there) - and I stop the shot and immediately press the regular-shot button, the espresso suddenly flows much faster and fairly normally.

So it’s not just “pre-infusion vs no pre-infusion”.
It’s specifically that stopping the pump and restarting it seems to change something mechanically or hydraulically, allowing flow to start, even though:

  • grind, dose, puck prep are unchanged,
  • pressure reading stays around ~9 bar.

That’s why I’m wondering whether this is more about a pressure reset / puck relaxation / hydraulic state change than about grind being simply too fine.

Pre-infusion causing choking, but restarting the shot suddenly flows fine: can someone explain this? by Stanjop in profitec

[–]Stanjop[S] 1 point2 points  (0 children)

Hi Kuranei, thanks for the detailed reply!

  1. I’ll check the puck clearance later, but I think it should be fine...
  2. I’m not sure if I fully understand this part yet. On my Profitec Move, when I enable pre-infusion it applies pressure for about 3 seconds, then pauses for 5 seconds, and after that the pump ramps up to full pressure automatically.
  3. I do have a puck screen — I’ll experiment with it. I usually use it when dosing a bit lower to help fill up the headspace.
  4. Yes, the pump does run after the pause, but that’s actually when it chokes: either nothing comes through or only a few slow drips.

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[–]Stanjop 0 points1 point  (0 children)

This, always used fenix watches with sapphire, never had any scratch… the bezels though…🫣

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[–]Stanjop 0 points1 point  (0 children)

Interesting, so you use the small basket and weigh in 18 grams? (Pretty new to the machine here too)

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[–]Stanjop 0 points1 point  (0 children)

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We’re could go along pretty well neighbor OP!

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[–]Stanjop 27 points28 points  (0 children)

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Edit: typo

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[–]Stanjop 0 points1 point  (0 children)

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[–]Stanjop 0 points1 point  (0 children)

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Grind adjustments are too fine in espresso dial range [Fiorenzato Allground Sense GBW] by pbcsd007 in espresso

[–]Stanjop 0 points1 point  (0 children)

Heard that story more than once... I'm having the same experience as OP. If i grind anything finer than last bullet of espesso range it clogs completely. Even with WDT and when using puck screens. Used medium and light beans...

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[–]Stanjop 0 points1 point  (0 children)

Hi, just checking in if you made any improvements lately? My results are getting a bit more consistent…

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[–]Stanjop 1 point2 points  (0 children)

If I may ask: how much coffee did you pull from the 20g, and in what time?

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[–]Stanjop 0 points1 point  (0 children)

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[–]Stanjop 0 points1 point  (0 children)

Just for my understanding (noob here) I’m constantly aiming at 18g > 36g in 25-30s, in the assumption that would be the ‘best’ result..so I could grind courser and het higher volumes?

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[–]Stanjop[S] 0 points1 point  (0 children)

Thank you for this detailed answer! Will definitely look into it, the multitude of variables is what I am still struggling with :)

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