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Thread: Oil cooled bean blaster

  1. #1
    Senior Member Lovey's Avatar
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    Oil cooled bean blaster

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Gday all, just had a go at my first roast yesterday using an un-modified (for now) Aldi popcorn popper, with the Indonesian Java beans from the newbie starter pack.
    Yesterday was a very wintery 24 degrees up here. *;D *
    1st crack came at 1 min 55, 2nd at 3 min 20, (very fast, I know) and taking some advice from here, I let them go until the end of the 2nd crack to see what would happen. *I dumped out a heap of oily, burnt beans into the Oil cooled bean blaster at 4 min 24.
    As expected, they tasted like ground up BBQ coals, mmm, mmm, tasty. :P
    I had another go today, but this time it was only 19 degrees. *1st crack came at 2 min 25, and I dumped the beans as the 2nd crack started at 4 min 15.
    I havent tried these ones yet, but they smell fantastic. :)
    Is this bean better suited as a SO or in a blend? *If it is better in a blend, what other types are recommended.
    Ive attached a couple of pictures of the Oil cooled bean blaster
    All the best,
    Steve.


  2. #2
    Senior Member Lovey's Avatar
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    Re: Oil cooled bean blaster

    Here you can see the handy de-tachable cooling tray, complete with handle.



  3. #3
    Senior Member Lovey's Avatar
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    Re: Oil cooled bean blaster

    Here you can see the engine room of the blaster. *A standard exhaust fan which has been butchered, I mean engineered, to fit into the body of the blaster. *This thing gets the beans cool to the touch in about 10-15 seconds, depending on the weather up here. *I know that its not exactly round, but that just adds to the charm of the device, dont you think? ;D
    All the best,
    Steve.


  4. #4
    Super Moderator Javaphile's Avatar
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    Re: Oil cooled bean blaster

    Quote Originally Posted by Lovey link=1124529098/0#0 date=1124529076
    Gday all, just had a go at my first roast yesterday using an un-modified (for now) Aldi popcorn popper, with the Indonesian Java beans from the newbie starter pack.
    Yesterday was a very wintery 24 degrees up here. ;D
    Now I *know yall are truely upsidedown people! Wintery and 24 degrees just *dont belong in the same sentence! Maybe Wintery and minus 24 degrees! But *certainly not Wintery and +24 degrees!! ;D

    Java "Knows which way is up" phile

    BTW, nice bean cooler. :) Gotta love ingenuity and using whats available. :)

  5. #5
    Mal Dimal's Avatar
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    Re: Oil cooled bean blaster

    Yep,

    Top job Lovey, no doubt about it [smiley=tekst-toppie.gif]

    Have you considered the "Soup Tin Chimney" mod on your popper? Its definitely worth a go and has the added benefit of stretching your roast times out a bit which adds a bit of extra body to the roasted bean flavour in the cup.

    Ridiculously easy to do and needs nothing more than said Soup Tin and a pair of trusty Tinsnips to cut an upside-down "V" section out of the bottom and then push the tin into the top of the popper. It might depend a bit on which type of Soup Tin you use and the dimensions of the popper but for my Tiffany popper, a section about 6-9mm wide and between 35-45mm high seems to do the trick pretty well.

    Youve given me some inspiration to create a similar cooler to yours you know, just have to find where I put that old 10 gallon paint drum I used to have and Ill be laughing 8-) ,

    Cheers,
    Mal.

  6. #6
    Senior Member robusto's Avatar
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    Re: Oil cooled bean blaster

    Your roast times are somewhat turbocharged by the Queensland winter-heat. How many grams are you doing? Try just 50 grams. That might slow things down a little, but in that sort of weather the difference may not be significant.

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    Re: Oil cooled bean blaster

    Just do it early in the morning when it is much, much cooler, like 9-15 degrees.

  8. #8
    Senior Member Lovey's Avatar
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    Re: Oil cooled bean blaster

    Gday all,
    just to give a bit more info about my roasting efforts.
    - Im not quite in Queensland, about 130km south, but we still get the nice mild winters. * ;) *Wait until summer, Ill have to roast at midnight when its 40 degrees plus in the day time, I think that the hottest Ive experienced here was 48. *>:(

    - The second and third roasts were done in 17 and 19 degree temps in the afternoon, Im not much of a morning person *;)
    - The roasts were all done with 80 gr so I could try and get some consistency between the roasts for my database, Ill try some smaller batches.
    - Ive got a tinned tomato chimney on the popper already, which wouldnt appear to help much in slowing it down. *I havent made a cut in the tin, but its wired to the top and it fits very snugly. *
    Geez, Id hate to see how fast it went without the chimney. :o

    - The popper is unmodified, but the electrical parts just arrived this arvo from Jaycar, so Im going to fit a new power supply to it and see how that goes in upping the fan speed.
    Wish me luck.
    All the best,
    Steve.
    P.S. Ive already got plans underway for the Oil cooled bean blaster MK II

  9. #9
    Senior Member robusto's Avatar
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    Re: Oil cooled bean blaster

    From what Ive read in several forums, the soup tin chimney is utilised for the popper to hold more beans...so they dont spill out.

    More beans mean quicker roasts.

    I cant see how the chimney would slow a roast. If anything, wouldnt the added mass hold in more heat, and therefore speed up the roast time.

    Also, would not the extra volume, irrespective of the material enveloping it, mean a longer escape path for the heat? Again, speeding up the roast?

    Any thoughts...

  10. #10
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    Re: Oil cooled bean blaster

    Hi

    Ive been using a tin (chickpeas I think it was) in the top of my popper for a couple of months now and I cant see a time difference between the 70g - 90g roasts I used to do without it and the 130g roasts I do now. 2nd crack always happens around 6ish mins depending on the bean.

    The biggest variation is from temperature in my laundry, 13c in winter and 36c in summer according to CoffeeRoastingDB.

    I just got this spiffy new glass lantern cover thing from Aussie disposals for $3.25. Anyone else had any experience in trying to attach it, its a perfect fit but it just sits there at the moment and Im worried Im gonna knock it off and break it (again).

    Luke


  11. #11
    Mal Dimal's Avatar
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    Re: Oil cooled bean blaster

    Behmor Coffee Roaster
    Quote Originally Posted by robusto link=1124529098/0#8 date=1124705581
    From what Ive read in several forums, the soup tin chimney is utilised for the popper to hold more beans...so they dont spill out.

    More beans mean quicker roasts.

    I cant see how the chimney would slow a roast. If anything, wouldnt the added mass hold in more heat, and therefore speed up the roast time.

    Also, would not the extra volume, irrespective of the material enveloping it, mean a longer escape path for the heat? Again, speeding up the roast?

    Any thoughts...
    Hi Robusto,

    Youre pretty right on all counts... With the plastic shroud removed though and a more direct path, straight up, for the heated air to exhaust through the maximum temp in the roasting chamber decreases slightly for a given bean load... roughly 25 C in the case of my Tiffany popper with a bean load of 80 grams.

    When the tin chimney is fitted, I can roast between 100-120 grams at a time depending on bean type and ambient temperature. I used to control the roast profile in an earlier popper I owned by blocking and unblocking the Butter Dish hole in the top of the plastic shroud... it achieved much the same effect as the chimney before I started experimenting with chimneys as an alternative.

    My current chimney is a kerosene lantern glass chimney that just happens to be a perfect fit in the Tiffany... Its one of the chimney types that has a bulge in the middle and a tube entering and leaving the bulge of the same size. Works really well and allows me the added luxury of viewing the roasting progress of the beans much more easily. Very handy when youre trying to pick the ideal stage of the roast to dump the beans and start cooling ;) .

    Cheers,
    Mal.



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