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Thread: Slowing popper roasting by turning popper on and off at intervals

  1. #1
    Junior Member Jazzymc's Avatar
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    Slowing popper roasting by turning popper on and off at intervals

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hey home roasters,

    My 1200w popper is running way too hot, if I leave it on with 75g of green beans with popper top removed, but chimney added (to stop beans jumping out) and fan pointed at the popper ... no matter what I do, either stir or shake the unit or put the fan on full blast, the whole roasting process is over in 4 minutes or less ... 1st and 2nd crack practically merge into each other which definitely isn't ideal.

    Today whilst using a digital thermometer, I tried slowing the roasting down by turning the popper on and off at regular intervals during the roasting process, but continuously stirring ... I would let it rise by a few degrees and then turn off the popper and let it cool a bit and then turn it back on. I think I was able to extend the roasting to about 6 minutes or so (first crack around 4 minutes and 2nd crack just before 6 minutes)

    Has anyone else tried this method before? Any tips or tricks? Is there any problems with this method? I must admit is quite labour intensive especially if I need to do more than 1 batch.

    If only I could find a popper which doesn't run so hot at 1200w.

  2. #2
    Mal Dimal's Avatar
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    Have you tried tilting the Popper over such that a reasonable percentage of the hot air is spilled past the bean mass?
    You can angle the tin-can over, such that the beans remain inside the Popper...

    Mal.

  3. #3
    Junior Member Jazzymc's Avatar
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    Quote Originally Posted by Dimal View Post
    Have you tried tilting the Popper over such that a reasonable percentage of the hot air is spilled past the bean mass?
    Yes I have tried it to a certain amount .... what angle do you think I should try? 45 degrees or more?

  4. #4
    Mal Dimal's Avatar
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    No mate...

    Thinking more like 15-20Deg.
    Poppers are peculiar beasts to get consistency from, even with identical models from the same manufacturer.

    If you're up for it, the easiest mod to do in an effort to cool things down a bit, is to remove the guts of the popper (carefully) and then drill a plethora of 8-9mm holes throughout the body of the popper and then reassemble. How well this works is quite variable too unfortunately, but worth a shot.

    The next mod would be to split the fan power supply away from the internal supply and drive this (the fan) with a 24V DC variable power supply. Speeding up the fan will cool the air passing through the heating element somewhat but have to be careful not to overdrive the fan - They're not known for being overly robust.

    After this, the next mod would be to separately supply the Heating Element itself but this may not be necessary.

    Have you read through the Roasting with a Popper thread here? Some good ideas in there...
    http://coffeesnobs.com.au/roasters/2...ng-popper.html

    Mal.

  5. #5
    Junior Member Jazzymc's Avatar
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    Quote Originally Posted by Dimal View Post
    Have you read through the Roasting with a Popper thread here? Some good ideas in there...
    http://coffeesnobs.com.au/roasters/2...ng-popper.html
    Hey Dimal,
    Yes I've read through it ... would love to do the fan and heat element mod, but it does look quite complicated. I will try taking everything out and blowing the fan at it and see if that cools it down a bit .... but in the end I think my best option going forward is to start saving up for a Behmor 1600 !! For meantime I'll just mess around a bit with the popper

  6. #6
    Mal Dimal's Avatar
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    A Behmor is definitely the way to go...
    Hope you're able to invest in one soon.

    I wouldn't advise operating the Popper without the outer case. Lots of exposed 240V AC connections in there and too easy to accidentally touch one and then - Goodnight . If you're not up for drilling holes in the outer case, I'd leave well enough alone. Play it safe please...

    Mal.

  7. #7
    Senior Member WhatEverBeansNecessary's Avatar
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    Behmor Coffee Roaster
    Second (or third Mal's comments) with regards to increasing airflow. Drilling holes will help a bunch.
    I did operate my popper without a top and would not recommend. Too easy to electrocute oneself.

    Try reducing the batch size by another 10-15 grams. I had great success with 60-65 gram roasts.

    I recently upgraded from a popper to the behmor. While a popper was great fun, the behmor really is the bees knees. They pop up for sale her for around the $300 mark regularly.



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