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Thread: Adjusting brew temperature to tune a shot flavour characteristics

  1. #1
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    Adjusting brew temperature to tune a shot flavour characteristics

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

    Ive got a PID Silvia which I used to make about 3-4 double shots everyday. My source of green beans are from coffeesnobs of course. I bought a batch of Yunan Wet-hulled beans not too long ago and I am going through my first batch of beans through the Gene Cafe. I roasted it to a few snaps into second crack. These beans seem to be quite dense and need alot of heat to get to second crack.

    I am tasting a bit of bitterness from my shot. I tried dropping the PID temp to 107 deg instead of the usual 108 deg in an attempt to reduce the bitterness. It might have help a tiny bit but I cant be sure.

    My question is, how do you go about changing the brew temperature to achieve the optimum taste? I always read about how so and so will set the temperature to xx because of the blend they are using. What determines this temperature? A rough guide would be very helpful. Thanks in advance.

  2. #2
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    Re: Adjusting brew temperature to tune a shot flavour characteristics

    Hi Onewheel,
    I dont have a silvia, but ill have a go at answering anyway.
    My question is, how do you go about changing the brew temperature to achieve the optimum taste?
    First off 107 deg sounds a bit high. If you could flush the group head a little longer until the temp drops to around 95 and then lock in your portafilter this may help.
    A general guide to brew temp goes something like this - if the temp is too low the espresso will taste grassy and acidy and will most likely be sharp and have a rough mouthfeel. Too high and it will taste woody and possibly bitter, as well as being pretty flavourless.
    So the idea is to find a balance between the two which displays the coffees inherent characteristics.
    Also good to keep in mind that there is a relationship between grind - dose - and temperature. So make sure that your grind and dose are exactly the same each time your experimenting with different temps, otherwise you will drive yourself mad.

  3. #3
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    Re: Adjusting brew temperature to tune a shot flavour characteristics

    I might have to try this temperature thing again when I get a proper thermometer for the brew head. The temp is set to 107 instead of 90-96 degrees in account of heat loss through the water path.

    Hmm.. Relationship between grind, dose and temperature? Im screwed then. I adjust my grind daily and my beans change weekly. I was afraid this would open up more questions then answers. Thanks for the tip anyway :).

  4. #4
    Mal Dimal's Avatar
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    Re: Adjusting brew temperature to tune a shot flavour characteristics

    Welcome "onewheel"... [smiley=thumbsup.gif]

    Dont get too hung up on the "temperature" thing mate..... ;)

    Sure, you can tailor the Brew Temperature to extract the best from the bean, down to the nth degree. Best thing really, is to adjust the PID Setpoint to a value that delivers water at 92-93C to the top of the coffee puck. From what Ive read re: Silvias with PID Controllers fitted, this setpoint temperature should be around 107-108C when the feedback t/couple is mounted on top of the Boiler.

    If you do a search of the forum going back a year or two, there is quite a bit of information on how to do an accurate temperature measurement on top of the puck, if you dont own a Scace Device (not many of us do) and Id recommend you do that, just to be certain of what is happening with your particular controller installation.

    All the best... :)

    Mal.

  5. #5
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    Re: Adjusting brew temperature to tune a shot flavour characteristics

    Behmor Brazen - $249 - Free Freight
    Sounds good enough to me Mal. :)



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