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Thread: Anyone ever seen this before

  1. #1
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    Anyone ever seen this before

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Happy new year and how good is it to be able to get great coffee from coffeesnobs.

    Just got to show you the state of my coffee lately,

    I have been buying and roasting green beans from here for years but i have never produced this before

    Look at the crema,Mexico el Triunfo Arabigo, roasted to around 8 with breadmaker and heat gun.
    Tastes great puck looks ok and this also happened with last roast Costa Rica Miel SHB.
    That was even better perhaps the best coffee i have ever bought.

    The only clue i have for this strange looking pour is my rocky grinder is now set to just above zero,12 years with the same grinder,well cleaned but burrs must be worn away, new burrs on the way.

    Anyway the coffee is fine, but i think its worth a look, has anyone ever seen this before because all my other shots for last 12 years were nothing like this.
    Attached Images Attached Images

  2. #2
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    Anyone ever seen this before

    Holy smokes, that looks like toothpaste coming out.

    Iíve never seen espresso come out like that before. Is it possible you left some cleaning powder in the portafilter or the group?

    How long were the beans rested after roasting?
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  3. #3
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    Hahah , no its not cleaning powder, the beans are around 4 days old and its 2 different roasts now, actually i hope it is a grinder issue cause its looking pretty weird, tastes is really really good though.
    I buy a decent coffee in sydney if ever im there ,so i have something to compare.

  4. #4
    Senior Member Yelta's Avatar
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    Interesting! the crema looks to be a column of foam.

    Have to say I've never pulled a shot straight out of the PF without a spout in place, is this your normal Modus operandi?

    Is it possible there is a small air leak in the system that's introducing air into the water flow, looks to be very large air bubbles in the stream.

  5. #5
    Senior Member simonsk8r's Avatar
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    Hahaha that's awesome! Like cheese whiz!

    I'd say it's a combination of potentially too fresh coffee, and the high pressure of squeezing that out of the small exit.

  6. #6
    Senior Member Lyrebird's Avatar
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    Quote Originally Posted by simonsk8r View Post
    the high pressure of squeezing that out of the small exit.

    It's got nothing to do with the orifice on the portafilter, the pressure drop across an 8mm orifice 10mm in length at that flow rate is about 0.1 Pa which is around 1 / 1000000 of a bar.

    FWIW I run both my machines without spouts and without problems.

  7. #7
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    Yelta,i took the spout off because i always pour a double shot into one cup/glass no other reason. I also wonder about an air leak as this phenom has only just started a few weeks ago, i put it down to the beans,Costa Rica Miel SHB. Icant grind any finer until new burrs arrive i'm hoping that is the cause. When i raise the lever coffee pours out just from boiler pressure and i don't need hardly any force on the lever...hardly any at all. Crema is solid and thick but lots of air...gonna get more Costa Rica Miel SHB beans though they are incredible.
    cheers

  8. #8
    Senior Member simonsk8r's Avatar
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    Quote Originally Posted by Lyrebird View Post
    It's got nothing to do with the orifice on the portafilter, the pressure drop across an 8mm orifice 10mm in length at that flow rate is about 0.1 Pa which is around 1 / 1000000 of a bar.

    FWIW I run both my machines without spouts and without problems.
    Ah fair enough, should have prefaced with "just a guess"

  9. #9
    Senior Member artman's Avatar
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    Mr Whippy does coffee!

    That looks bizzare.

    Certainly looks like it is aerated. Next time do a quick vid, will give a better picture.

    Cheers
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  10. #10
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    Quote Originally Posted by brianleon View Post
    The only clue i have for this strange looking pour is my rocky grinder is now set to just above zero,12 years with the same grinder,well cleaned but burrs must be worn away, new burrs on the way.
    I can't explain your fizzy pour, but I replaced the burrs on My Rocky after 13 years, went from 65 seconds for 18g of beans to 32 seconds. Also went from needing "the finest setting where the burrs weren't completely jammed together" (still too coarse) to about five divisions back from just touching.
    Then my Niche Zero arrived and I've pretty much forgotten all about the Rocky. 23 seconds for 18g, super quiet and super consistent with almost no grounds retention.

  11. #11
    Senior Member speleomike's Avatar
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    Hi

    One can find this phenomena via a Google search. Here is one link displaying it.
    This link suggests its the air that was above the puck being forced out. One normally does not see it as its inside the PF.
    And one person suggested "Extreme amounts of foam from a lever in my experience are air being forced through the puck, so likely the cylinder wasn't filled to it's ideal level."
    https://www.home-barista.com/levers/...ma-t34836.html
    And there are some links in there on bleeding.
    Certainly the video in that link above does show the same phenomenon.

    Mike
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  12. #12
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    Thanks spelomike i am onto it now. If i get rid of any excess air and replace it with water i will get a true double shot(i assume) i always thought the shots were a little shy so i will measure em.

  13. #13
    Senior Member greenman's Avatar
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    Behmor Coffee Roaster
    One comes to mind from years ago, a Monsoon Malabar espresso roast run through the machine soon after roasting--but not to the extent of that pic!!
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