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Thread: em6910 bubbles in shot

  1. #1
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    em6910 bubbles in shot

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    hi guys

    odd thing - appears that in my shots I am getting bubbles.

    Have adjusted grind, currently on 16 (em0480), beans are 1 week old.

    However, have never adjusted brew temps on machine (or steam wetness for that matter either)

    could this be it? the shot is too cold? it has been doing it a little while now. machine was cleaned last week with cafetto

  2. #2
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    Re: em6910 bubbles in shot

    Can you post a photo?

    Coffee could be still fresh even though its 7 days old. Im assuming it is elevated levels of CO2 and can be caused by many things including but not limited to roast style (depth and duration of roast), faulty gusset valve in bag, brew water temperature too high (unlikely on EM6910 but if youre working on the Faema, it may be a possibility).

    Best of luck,

    David.

  3. #3
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    Re: em6910 bubbles in shot

    hi david

    just got back to the forum, its still happening and annoying the hell out of me. it is on the em6910, the beans are from a good raoster etc, however the co2 is a consideration if there bags are no good.

  4. #4
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    Re: em6910 bubbles in shot

    Yeah, a photo of what it looks like exactly would be great.

    Are the bubbles small/large?

    Ive never experienced this with my EM6910 before,


  5. #5
    Senior Member Magic_Matt's Avatar
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    Re: em6910 bubbles in shot

    I get this reasonably often; typically in shots with very thick crema, bubbles about 0.5mm in diameter start appearing after a minute or so. AFAICT its related purely to the beans Im using.

  6. #6
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    Re: em6910 bubbles in shot

    i reckon i have it figured -overpacking the basket!


    I tried to underdose my normal dose last night and it worked better, nice crema and no bubbles. i packed as normal this morning and bubbles.....


  7. #7
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    Re: em6910 bubbles in shot

    took a photo of the "shot" then showed it to Greg Pullman and Chris from TalkCoffee today at CafeBiz. They both concured that it was young coffee and a little gassy, apart from that all good!

    Phew - thanks guys, really appreciated.

  8. #8
    TC
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    Re: em6910 bubbles in shot

    Quote Originally Posted by 6169606E79797E620C0 link=1300795797/5#5 date=1304736413
    i reckon i have it figured* -overpacking the basket!

    I tried to underdose my normal dose last night and it worked better, nice crema and no bubbles.* i packed as normal this morning and bubbles.....
    Glad to help melbuurn.

    You were heading in the right direction anyway. A good way to manage really young coffee is lower and finer and perhaps even with a lighter tamp.

    All the best...

    Chris

  9. #9
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    Re: em6910 bubbles in shot

    thanks Chris

    Was a pleasure to put a face to the voice at Cafe Biz

  10. #10
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    Re: em6910 bubbles in shot

    Quote Originally Posted by 4A424B4552525549270 link=1300795797/8#8 date=1306669503
    thanks Chris

    Was a pleasure to put a face to the voice at Cafe Biz
    Likewise melbuurn. Its always great to meet another CSer. Pop in for a coffee some day ;)

    Chris

  11. #11
    Roz
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    Re: em6910 bubbles in shot

    Im getting large bubbles in my recent shots, locally roasted beans last week I had a pack that was 2 days post roast, even up until last night I was still getting large bubbles in the last of those beans.

    Off to the same cafe today picked up some of their house blend, roast date was thursday, my normal dose, tamp, PID temp, shot looks great for the first 10 seconds, then starts to blonde early and come through a bit faster, bubbling quite a bit so I stop the shot, big bubbles, taste is a bit bitter, let it sit while I steam some milk the crema dissipates into virtually nothing by the time Im done, the taste was okay in milk not fantastic but not bad.

    I didnt try lowering my dose as I normally pack 19g into my synesso with a consistent firm tamp. Im using a naked PF, there was no evident channeling.

    Ive just cleaned my grinder, I will try grinding finer, lowering dose and tamping a bit less and see what happens tomorrow.

    If this doesnt improve Ill go get some other beans from another roaster, I generally choose this cafe as they have a great range of roasts available, and I have tried these roasts before and they have always provided great shots with thick creamy crema.




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