HomeRoast Digest


Topic: odd first crack (5 msgs / 188 lines)
1) From: Stephen Carey
This may be fairly normal and I just haven't roasted enough batches 
to know it, but someone here will.  I was roasting 5.5 oz. of 
Tanzania NgorNgor Convent.  The roast was going fine, other than I 
forgot to turn the exhaust fan on for the first few minutes so heat 
may have been hanging out in the dryer duct going from the IR2 to the fan.
I heard what sounded like the beginning of the first crack a bit 
early, at 5:50 into the roast, but it was only one, fairly loud 
crack.  Then, about 25 seconds later they took off and went through 
the first crack cycle.
This has happened once before that I have noticed or logged - and I 
log a lot of information during this learning time.  Is this fairly 
normal, maybe a small bean cracks first and the others go when 
expected or perhaps it contains something that makes it crack early?
I can say that when I did the bean crunch test, which can only give 
me limited information, but if it is good there I know I will have a 
decent roast, the bean was incredible - I promise, I could taste 
apple.  It wasn't my mind wanting to taste it, for I tried another 
one and there it was, a wonderful apple taste near the front of the 
full taste (make sense?).
Thanks for any help on this probably normal occurrence.  Perhaps I 
just haven't listened well enough to hear it very often.
All the best,
Stephen

2) From: True, Dennis W. FC1 (CVN69)
Ok so you told us about the First Crack but when did you stop the roast
and at what roast level did you finish the roast?
Inquiring minds want to know....
Apple that would be interesting 
Dennis

3) From: Stephen Carey
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Sorry, I was still upset that I had miscounted my roasts and had done 
fewer than I had thought, and that is with good logs - guess the 
excitement got to me.
Anyway, the roast finished at a healthy City +, right on, I 
believe.  The roast went 8:15 total.
I ran a second roast just to see what would happen if I darkened it 
up a touch, that went 8:25, with the first crack at 6:03.  I added 
time to the second cycle - 5 more seconds at 395F for a total of 3:25 
on that cycle.  Then 5 more seconds to the last cycle to a time of 
2:20 at 450F, it went slightly darker, but stayed in the City + 
range, the color is barely darker, the taste not quite as fruity on 
the crunch test (I crunch it and let it sit on tongue for a while and 
just notice what I taste).  Still was very good.
Tomorrow I will do an early taste, at about 12 hours, then wait for 
24 and more for the true flavor.  I kept each roast apart so I can do 
a side by side comparison to see which I prefer.
Stephen
At 08:29 PM 8/17/2007, you wrote:
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Sorry, I was still upset that I had miscounted my roasts and
had done fewer than I had thought, and that is with good logs - guess the
excitement got to me.
Anyway, the roast finished at a healthy City +, right on, I
believe.  The roast went 8:15 total.  
I ran a second roast just to see what would happen if I darkened it up a
touch, that went 8:25, with the first crack at 6:03.  I added time
to the second cycle - 5 more seconds at 395F for a total of 3:25 on that
cycle.  Then 5 more seconds to the last cycle to a time of 2:20 at
450F, it went slightly darker, but stayed in the City + range, the color
is barely darker, the taste not quite as fruity on the crunch test (I
crunch it and let it sit on tongue for a while and just notice what I
taste).  Still was very good.  
Tomorrow I will do an early taste, at about 12 hours, then wait for 24
and more for the true flavor.  I kept each roast apart so I can do a
side by side comparison to see which I prefer. 
Stephen
 
At 08:29 PM 8/17/2007, you wrote:
Ok so you told us about the
First Crack but when did you stop the roast
and at what roast level did you finish the roast?
Inquiring minds want to know....
Apple that would be interesting 
Dennis
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4) From: Aaron
I experience this a lot in my I roast.   Ill have first crack hanging on 
the threshold right about the 515 - 530 mark, with the occasional bean 
crack being heard., then at 6 minutes when I ramp the heat they take off 
like crazy and finish off around 730 ish  sometimes 700 if I rush it or 
want a lighter roast.
As long as the first crack is reached and you gave it enough time for 
most or all the beans to actually hit it then it's normal and you should 
be fine.
aaron

5) From: John Brown
my problem is i can't hear the first crack or even the second.
Aaron wrote:
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