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Thread: Levetta brew pressure

  1. #1
    htb
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    Levetta brew pressure

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi Snobs,

    I managed to pick up a cheap Levetta the other day and am pretty happy with it. It was filthy when I got but a new shower screen, seal and lot of scrubbing fixed that.

    Anyway I have only made about four shots on it so far and have noticed that the brew pressure doesnt get over 8 bar. Should I be concerned with the pressure and if so how can I adjust this?

    The coffee also seems to be a tad hot and tastes a little bitter but this could be due to my technique (or lack of). I am still getting aquinted with this machine and its crazy steaming ability.

    Thanks




  2. #2
    Senior Member flynnaus's Avatar
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    Re: Levetta brew pressure

    Is this 8 bar on the pressure gauge on the front? Sounds too low. Mine shows 10 bar, and that was after it was properly adjusted by Chris from Talk Coffee to deliver 9 bar at the grouphead.

    Bitter could be due to under-extraction due to under-dosing, too coarse grind or channeling. If you are in Sydney or Melb. might be worthwhile having someone look at it.


  3. #3
    htb
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    Re: Levetta brew pressure

    Its 8 bar on the front gauge. I am aware that it will be different at the group but from what I understand its usually lower not higher.
    What effect does the brew pressure have on the shots?

    I am still experimenting with the dose, tamp etc and the shots taste okay so I am too fussed with slight bitterness at the moment.

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    Re: Levetta brew pressure

    Quote Originally Posted by flynn_aus link=1226635869/0#1 date=1226637284
    Is this 8 bar on the pressure gauge on the front? Sounds too low.
    8 bar is way too low. this is the system pressure which needs to up around the 10-10.5 range in order to achieve 9bars at the head. once that is adjusted, then youll need to see if its running too hot as well.

    as flynnaus mentioned, it wouldnt hurt to take in and have one of our sponsors look at her.

    sd

  5. #5
    Senior Member flynnaus's Avatar
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    Re: Levetta brew pressure

    Quote Originally Posted by htb link=1226635869/0#2 date=1226638334
    Its 8 bar on the front gauge. I am aware that it will be different at the group but from what I understand its usually lower not higher..
    The grouphead pressure is lower than what the pressure gauge shows.

    What effect does the brew pressure have on the shots?
    Under-extraction, as the water will be pushed through the grounds at a higher pressure, therefore faster

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    Re: Levetta brew pressure

    Quote Originally Posted by flynn_aus link=1226635869/0#4 date=1226638852
    Under-extraction, as the water will be pushed through the grounds at a higher pressure, therefore faster
    Actually, I have heard that higher pressure produces SLOWER pours, not faster. Apparently this has to do with the puck getting more compressed under the higher pressure, therefore compressing the grind particles closer together and slowing the flow.

  7. #7
    htb
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    Re: Levetta brew pressure

    Quote Originally Posted by flynn_aus link=1226635869/0#4 date=1226638852
    The grouphead pressure is lower than what the pressure gauge shows.
    Thats what I thought.

    Okay, so by sounds of it the pressure is low as suspected, any ideas on how/where to adjust this?
    I take it the hole in the top is for the temperature.

    I would take it to a site sponsor but I have car problems at the moment.

  8. #8
    htb
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    Re: Levetta brew pressure

    I opened up the case, found and adjusted the valve. Its a remarkably simple machine.
    I just did a test shot and it hit just over 9 bar so an improvement but still a bit lower then what I think is right based on the theory that the group is 1 - 1.5 bar lower then the boiler.

    The shot definitely tasted better and less bitter. I will adjust it further tomorrow if I can sleep tonight :D *

    Thanks for the help!

  9. #9
    Mal Dimal's Avatar
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    Re: Levetta brew pressure

    By the way "htb"...

    How fresh is your coffee and is it good quality and also, which grinder do you have? ::)

    Mal.

  10. #10
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    Re: Levetta brew pressure

    Hi Mal, I bought the coffee from Di Bartoli last week and am using a rocky to grind it.
    The pressure is now at 10 bar and I am getting a much better coffee :D

  11. #11
    Mal Dimal's Avatar
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    Re: Levetta brew pressure

    Excellent..... [smiley=thumbsup.gif]

    Mal.



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