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Thread: Do you pre-heat your corretto?

  1. #1
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    Do you pre-heat your corretto?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    When I was reading this post
    http://coffeesnobs.com.au/YaBB.pl?num=1214989367

    I noticed that the corretto (I assume corretto as this is in the signature) was preheated about 220 degrees Celsius and then the beans put in. This is from the attached zip file.

    Yet another chart
    http://coffeesnobs.com.au/YaBB.pl?num=1195544620 (reply 10)
    show the ambient temperature on the day.

    I can see why a BBQ roaster would need to be preheated, but a corretto?

    What do you all do, preheat or drop in at ambient temperature?

    Cheers

  2. #2
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    Re: Do you pre-heat your corretto?

    Hi PhilMac
    I dont preheat my corretto at all, i dont even preheat my heatgun.

    Mal

  3. #3
    Senior Member MeanzBeanz's Avatar
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    Re: Do you pre-heat your corretto?

    Same here. No preheating. I have only done 8 roasts but they have all turned out ok.

  4. #4
    ev
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    Re: Do you pre-heat your corretto?

    I dont preheat.

    Evan.

  5. #5
    Senior Member greenman's Avatar
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    Re: Do you pre-heat your corretto?

    I dont preheat. I usually have the heatgun lower in the bucket until it gets to around 100C then back it off gradually to the roast profile I am aiming for.

  6. #6
    Sleep is overrated Thundergod's Avatar
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    Re: Do you pre-heat your corretto?

    No pre-heating.
    Almost 100 roasts now.


  7. #7
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    Re: Do you pre-heat your corretto?

    Hmm, I pre-heat. Generally switch on the breadmaker to stir and run the heatgun on full (Ryobi 2-speed on high = 600C) for about 1-2 minutes. Dont use a temp probe yet, but I reckon it would heat the pan to 100-150C. Pre-heating wouldnt very effectively heat the beans faster though... now that I think about it. Theres not enough thermal mass in the breadmaker pan... But it does seem like a good idea to heat the gun up.

    Theoretically, its a good idea to get the beans above 100C as soon as possible... though someone else will better be able to tell you why. ;)

    Cheers
    Stuart.

  8. #8
    CoffeeSnobs Owner Andy's Avatar
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    Re: Do you pre-heat your corretto?


    I assume corretto as this is in the signature
    ...or maybe the data source was someone with a drum roaster?

    **wink**


  9. #9
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    Re: Do you pre-heat your corretto?

    I dont preheat my corretto but i used to preheat my pot roaster.

  10. #10
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    Re: Do you pre-heat your corretto?

    No preheating at all.
    Just dump the beans in, turn on the BM and HG, start the timer and away we go.
    Another roast on the way.

  11. #11
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    Re: Do you pre-heat your corretto?

    Why would you pre-heat a drum roaster but not a corretto?

  12. #12
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    Re: Do you pre-heat your corretto?

    I pre-heat my corretto for a couple of minutes while Im setting up. I dont know why I do, just habit of pre-heating.... maybe to just take that cold bite out of the pan, to get the beans up to temp quicker without scorching them. I think last time I looked though, the temp probe was only reading someting like <80 when I dumped in the greens... Ill have to double check that though, I cant really remember.

    And admittedly, Ive only done a handleful of roasts in the Corretto.

  13. #13
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    Re: Do you pre-heat your corretto?

    Quote Originally Posted by NewToEspresso link=1215512207/0#10 date=1215556970
    Why would you pre-heat a drum roaster but not a corretto?
    I was refering more to the home made BBQ rotisiery type barrell roaster rather than the smaller Gene drum-type ones. A BBQ has a much larger thermal mass and would take a lot longer to heat up than a smaller corretto arrangement. Mind you Gene owners may pre-heat as part of their routine, I dont know.

    Commercial roasters would obviously put beans into an already hot roaster.

    I wonder why it is best to have the beans above 100 degrees C quickly? Maybe so they dont stew, as versus roast?

    Cheers

  14. #14
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    Re: Do you pre-heat your corretto?

    I am getting a little confused by this topic. I had previously done all my roasts from a cold start (no pre-heating). During the latest beanbay pickup and talking to Andy, he suggested that a preheat is the way to go and though it might be more applicable to a drum roast, I dont see why a corretto wont benefit from pre-heating either. So I tried a roast pre-heating and i don;t know if its psychological or not, but I thought that the preheated roast tasted significantly better than the previous roasts of this bean. Ive proceeded to preheat the few roasts since then and I havent cupped them yet. I would have thought that pre-heating was beneficial because it would mean you dont apply heat too quickly at the early stages. From a cold start, the first 2-3 minutes, the rate of temp rise would be 30-40 degs a minute. It will then taper down to 25 degs a minute for the next minute and a half, and keep slowign down after that. On preheating, it would start at a higher temp, but would not climb at more than 25 degs a minute from there on. So, which one is better? I know Ill be asked to judge by taste but I dont quite trust my taste when it comes to coffee because I dont really know how to appreciate espresso unadulterated (by sugar or milk).

  15. #15
    Sleep is overrated Thundergod's Avatar
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    Re: Do you pre-heat your corretto?

    Wouldnt pre-heating the pan would only warm the few extra beans that are in contact with it from the beginning as opposed to a cold start?

    If the majority of the beans arent being affected by pre-heating the pan then whats the point?

    Wouldnt a short period of time warming the beans on a low heat be better?
    Note I said WARM so as not to be accused of baking the beans.

    What would be a good temperature and time to aim for (if thats a good idea) before switching to high?

  16. #16
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    Re: Do you pre-heat your corretto?

    Quote Originally Posted by PhilMac link=1215512207/0#0 date=1215512206
    (I assume corretto as this is in the signature)
    Confession: the data was Andys - he bench tested the spreadsheet for me. ;)

    The questions a good one!

  17. #17
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    Re: Do you pre-heat your corretto?

    Ahh, so Andy pre-heats, or was that a drum roaster as suggested????

    Cheers

  18. #18
    sdg
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    Re: Do you pre-heat your corretto?

    Think that wasnt a suggestion guys, more like a hint wrapped round a brick

    Or, reading between the various lines, Intellidepths beooutiful sample curve is from Andys (preheated) drum roaster ;D

  19. #19
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    Re: Do you pre-heat your corretto?

    Simone, spot on :)

  20. #20
    Senior Member greenman's Avatar
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    Re: Do you pre-heat your corretto?

    I did two roasts last week when the ambient temp in my garage was 3C, the first roast I started from cold and ramped it up as per usual roast method.
    The next batch I pre-heated the bucket (Corretto) to 80C and then added beans, the temp very quickly dropped back to low temp readings and by the time it reached 50C the time was within a few seconds of the first batch from cold start--so I think I will stick with cold starts.

  21. #21
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    Re: Do you pre-heat your corretto?

    Ive been preheating my corretto to 130 or 135 degrees and then loading the beans. The temp then drops to about 70 degrees before starting the slow climb up again. Dont really know if it improves on the taste as my palate is really untrustworthy when it comes to espresso. And the taste of the espresso is dependent on so many other factors...

  22. #22
    Mal Dimal's Avatar
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    Re: Do you pre-heat your corretto?

    Behmor Coffee Roaster
    Nope,

    I never bother to do it.... The thermal mass of the bread-pan and stirring blade(s) is insignificant compared to the mass of the beans being added. If Im roasting several batches back to back, by the time Ive cooled and bagged the most recent batch, the bread-pan is back to ambient temperature so each batch is in effect, roasted from the same point of origin.

    Also agree with "greenman", the change to the shape of the roast profile is immeasurable from a practical point of view. A totally different scenario though if youre talking about commercial roasters using drums that can weigh as much as a man.... a lot of mass there to either sink or soak thermal energy from/to the bean mass. Pre-heating in this situation is essential,

    Mal.




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