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9 bar
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FatBuck
Senior Member


Joined: 16 Oct 2013
Posts: 6
Location: Fernie BC Canada
Expertise: I love coffee

Posted Wed Oct 16, 2013, 6:51pm
Subject: 9 bar
 

So I adjusted my Bezzera BZ40, which has a rotery pump, to 9 bar.  The pump was replaced some time ago and I had set it to 12 bar.  I noticed early blonding on almost all shots, then started to notice the channels.  I realized the water was jetting through the puck.  I reduced it to 9bar and the shots looked better, less blonding.  BUT the puck isn't hard and I still get a lot of channeling.

My equipment should be sufficient:

Bezzera BZ40DE espresso machine
Espro tamper
Mazzer Mini Electronic B grinder
Behmor coffee roaster
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bjornm
Senior Member


Joined: 18 Feb 2012
Posts: 19
Location: New York
Expertise: I love coffee

Espresso: Qiuckmill Anita
Grinder: Robur E, Baratza Preciso
Posted Wed Oct 16, 2013, 8:03pm
Subject: Re: 9 bar
 

Sounds like a distribution problem and not so much related to pressure.
Is this a new problem? Have you tried WDT or similar?
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FatBuck
Senior Member


Joined: 16 Oct 2013
Posts: 6
Location: Fernie BC Canada
Expertise: I love coffee

Posted Wed Oct 16, 2013, 8:22pm
Subject: Re: 9 bar
 

bjornm Said:

Sounds like a distribution problem and not so much related to pressure.
Is this a new problem? Have you tried WDT or similar?

Posted October 16, 2013 link

I think you are right.  I went back and was very meticulous about the distribution of the unpacked grounds.  It seemed to help.  Strange enough the puck is better, but it sticks to the grouphead when I remove the portafilter.  I measured out exactly 14g in the 14g basket.  I thought the puck wasn't supposed to touch the screen, but it obviously does.
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jonr
Senior Member


Joined: 25 Jun 2013
Posts: 298
Location: Americas
Expertise: I like coffee
Posted Wed Oct 16, 2013, 8:34pm
Subject: Re: 9 bar
 

FatBuck Said:

I thought the puck wasn't supposed to touch the screen, but it obviously does.

Posted October 16, 2013 link

I would reduce the dose until it doesn't touch (during brew).  Beyond grind, dose and tamp, pressure ramp rate and preinfusion will effect channeling.
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boar_d_laze
Senior Member


Joined: 21 Nov 2006
Posts: 1,317
Location: Monrovia, CA
Expertise: I live coffee

Espresso: La Cimbali M21 DT/1 Junior...
Grinder: Ceado E92; "Bunnzilla"
Vac Pot: Royal Coffee Maker
Drip: Chemex + Kone; Espro Press
Roaster: USRC Sample Roaster
Posted Thu Oct 17, 2013, 8:34am
Subject: Re: 9 bar
 

FatBuck Said:

I think you are right.  I went back and was very meticulous about the distribution of the unpacked grounds.  It seemed to help.  Strange enough the puck is better, but it sticks to the grouphead when I remove the portafilter.  I measured out exactly 14g in the 14g basket.  I thought the puck wasn't supposed to touch the screen, but it obviously does.

Posted October 16, 2013 link

It's not that simple.  After the shot is pulled and the water stops, a vacuum forms in the group and sucks the puck up against the screen.

BDL
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