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Thread: Domobar Jnr making plane coffee

  1. #1
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    Domobar Jnr making plane coffee

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi guys I have a Domobar Jnr matched with a Mini Mazzer both less than 12 months old. Lately my coffees have been lacking favour and body. I have tried 3 different brands of coffee (all fresh beans) and grind settings, more beans, tamping pressures.
    Any ideas on why only plane, lacking body and full flavour?? I have noticed 2 of my 3 coffee beans were of a lighter roast.

    Thanks

  2. #2
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    We need a lot more info before we try to sort out your problem. eg doubles or singles, dose amount/weight, levelling, tamp, age of beans, roast date, cleanliness of machine, your technique etc etc etc.

  3. #3
    TC
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    G'day mmm,

    Lighter roast- yes. You will probably need a very tight pour to get anything remotely drinkable (and then it's still not what I want to drink as an espresso). Remedy? Buy fresh espresso roast.

    On another note, when was your machine last serviced and checked?

  4. #4
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    Thanks guys. Here's some more info...
    Double shots in VST baskets
    18-20g with pour of 25seconds
    Drink milk based drinks- flat whites
    Age of beans from 1 week-3weeks (used up by 3 weeks after roast date)
    Machine is spotless and regularly back washed etc.
    Machine hasn't been services- noticed that if I over dose it make a squeezing sound (done since new) is this normal??

    Hope that helps.

  5. #5
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    Machine is only about 8 months old too

  6. #6
    TC
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    Try winding the pour out to more like a 35 sec double ristretto and see how it goes.

  7. #7
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    If I let is run longer it overextracts and goes a very pale/ clear pour

  8. #8
    TOK
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    "...Any ideas on why only plane, lacking body and full flavour??..."

    The beans / blend / roast.

    Referring back to post # 3 = "...Remedy? Buy fresh espresso roast..."

  9. #9
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    Quote Originally Posted by mmmcoffee View Post
    If I let is run longer it overextracts and goes a very pale/ clear pour
    What you are describing is underextracted light roast. Assuming the machine is operating correctly and your technique is satisfactory, these light roasts do benefit from a tight pour (as mentioned to deliver double ristretto volume in more like 35 sec from the appearance of the first drops). That said, I'd still rather pour many of the examples of very light roast espresso into the sink rather than consume them.
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  10. #10
    Senior Member Vinitasse's Avatar
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    I'm still trying to figure out what aircraft have to do with coffee ;-P
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    Quote Originally Posted by mmmcoffee View Post
    If I let is run longer it overextracts and goes a very pale/ clear pour
    try grinding finer so that its almost but not quite choking the machine.

    Another possibility if its suddenly going very pale is channeling. Do you have or can you borrow a naked portafilter? If not, when you look at the puck after the shot, are there any cracks or holes?

  12. #12
    Senior Member artman's Avatar
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    I was going to mention channeling also as a possibility of early blonding. Easily diagnosed with a naked PF and could be a possibility as some people report the VST baskets being finicky?

    Cheers

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    Quote Originally Posted by Vinitasse View Post
    I'm still trying to figure out what aircraft have to do with coffee ;-P
    Guarantee of very plane bad coffee!
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  14. #14
    Senior Member Barry O'Speedwagon's Avatar
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    Quote Originally Posted by water_dragon View Post
    Guarantee of very plane bad coffee!
    But should at least be smooth.

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    yes this is my only contribution i'm sorry

  16. #16
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    ^^^^^ ahh that picture explain my plane coffee

    Will try my naked portafilter tomorrow and see. Normally picks are solid, dense and dry. The bean pre grinding are weighted to get correct amount in the portifter.
    I'll play around with grind some more and and naked portafilter and see how it goes, and report back.

  17. #17
    TOK
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    Afraid this has nothing much to do with "channeling". Channeling or not, the same end effect will apply from using too light a roast without being mindful of excellent advice in post #9 above.

    So called "naked" group handle ditto....channeling or not, it has not much to do with the end result if all the usual variables in espresso making are being given a good run by the operator. Sometimes you just get channeling and the coffee is still well acceptable. Look elsewhere for what is said to be happening here, put naked thingomibob in the drawer for use to impress your guests.

    KIS (keep it simple) please and stop looking for problems where they dont exist.

    First up, throw light roast coffee into the garden and buy espresso style roasts for use in making traditional espresso style coffee (if that is what you seek). Plenty of time after that for endless speculation.

    Be mindful, that it is tiresome for respondents to keep giving good advice but have people ignore it.....it tends to have a nett effect of good people nolonger bothering to give their advice in forums...

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    Thanks TOK I totally agree, I have beans brought from well known & site sponsor had their bra sinter cafe and purchased them. They are slightly in the lighter side, but it too much. Just roasted up a darker batch of my own green beans today willowy you know, but suspect it's the slightly lighter roast.
    Out of interest if it is, why would these beans taste so brilliant at the cafe and not as great at home??

    Appreciate all the responses and help!!

  19. #19
    Life-long Learner DesigningByCoffee's Avatar
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    Quote Originally Posted by mmmcoffee View Post
    Out of interest if it is, why would these beans taste so brilliant at the cafe and not as great at home??
    Most likely different technique - maybe brew temp too
    If I do a 'tradtional' 25ml / 25sec pour on just about any of my slightly lighter roasts they taste sour - but grind finer and slow it down … mmmmm
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    Caffeinated kopigeek's Avatar
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    I've got a vbm Jnr and agree with the above, slow down the pour and the lighter roast will taste better.

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    Hey guys out of interest, when I grind fine my Jnr make a sqeel sound, does anyone else have this, or know what it might be, has done so since new??

  22. #22
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    Domobar Jnr making plane coffee

    Quote Originally Posted by mmmcoffee View Post
    Hey guys out of interest, when I grind fine my Jnr make a sqeel sound, does anyone else have this, or know what it might be, has done so since new??
    Mine does also. It whines/squeals when it goes above 9bar and closer to 10.
    Last edited by kopigeek; 18th April 2015 at 10:37 PM.

  23. #23
    Mal Dimal's Avatar
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    It's just the OPV bypassing water back to the tank....

    As the pressure approaches the OPV setting, the valve action can sometimes setup a harmonic that is audible. Nothing to worry about, unless it's annoying...

    Mal.
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  24. #24
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    Apologise on the delay in responding
    Roaster darker and the coffee has one back more full bodied. If expect the toaster I had brought must have been too light.

    As far as the OPV squeezing it still happens most shots pulled at it is a little annoying Mal, anything that can be done??

  25. #25
    Mal Dimal's Avatar
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    Quote Originally Posted by mmmcoffee View Post
    As far as the OPV squeezing it still happens most shots pulled at it is a little annoying Mal, anything that can be done??
    Not a lot mate, other than changing out for a different type of OPV.

    You could try and grab a few samples of suitably rated (and length) springs, to see if the harmonic can be shifted outside the range of the normal operating pressure. Other than this, it's a hydro-mechanical interaction and can only be adjusted/calibrated via physical attention to the components involved unfortunately...

    Mal.

  26. #26
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    Thanks Mal! Regardless of the slight noise love this machine!!
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  27. #27
    Mal Dimal's Avatar
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    Yep, VBMs are very decent machines. No doubt about it...

    Mal.

  28. #28
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    Sure is Mal love the looks of her and great machine to make coffee on
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    plain (10 chars)



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