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Factory brew pressure, to adjust or not to adjust?
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qualin
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qualin
Joined: 30 Jun 2012
Posts: 662
Location: Calgary, AB
Expertise: I love coffee

Espresso: Izzo Alex Duetto 3
Grinder: Mazzer Mini Elect. Type A
Vac Pot: Looking to buy
Drip: Manual
Roaster: Considering?
Posted Wed Jan 16, 2013, 9:35pm
Subject: Factory brew pressure, to adjust or not to adjust?
 

I could probably read about this forever, but I thought I'd ask other Duetto 2/3 owners here.

So far, I've been using my machine for about a month now, "Out of the box".  

According to the brew pressure gauge, extractions happen at 10 bar. Locking in a portafilter with a blind basket results in 10.5 bar reading.

This is the way the machine was delivered to me and it makes great coffee. However, after going through about 2.5 kg of coffee, I've noticed some coffees are much more prone to
channeling than others. Doing a 2 second pre-infusion seems to help, but before I start doing things like WDT or grinding finer with 13-14 gram doses in order to avoid it, I wonder if I should
lower the brew pressure so it reads 9.5 bar with a blind portafilter to lessen the possibility of channeling?

For the people who have adjusted the brew pressure on their Duetto 2/3, What were your results? What did your machine do when "stock"?

 
Garbage In, Garbage Out, for every step of the process. From Beans to grinder, grounds to machine, coffee to cup.
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emradguy
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emradguy
Joined: 31 Mar 2011
Posts: 3,146
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4 x2, VDD...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Wed Jan 16, 2013, 9:41pm
Subject: Re: Factory brew pressure, to adjust or not to adjust?
 

Hey Man! Where ya been? Vacation?

I lowered my brew pressure to 9bar, but for flavor, not for channeling. I don't see myself raising it back up.

 
.
Always remember the most important thing is what ends up in your cup!
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qualin
Senior Member
qualin
Joined: 30 Jun 2012
Posts: 662
Location: Calgary, AB
Expertise: I love coffee

Espresso: Izzo Alex Duetto 3
Grinder: Mazzer Mini Elect. Type A
Vac Pot: Looking to buy
Drip: Manual
Roaster: Considering?
Posted Wed Jan 16, 2013, 10:26pm
Subject: Re: Factory brew pressure, to adjust or not to adjust?
 

emradguy Said:

Hey Man! Where ya been? Vacation?

Posted January 16, 2013 link

Work work work work work.. :) Sometimes posting or reading these forums can be a little time consuming and the days after xmas are very hectic.

emradguy Said:

I lowered my brew pressure to 9bar, but for flavor, not for channeling.

Posted January 16, 2013 link

What was it before and what changes in flavor did you notice?

 
Garbage In, Garbage Out, for every step of the process. From Beans to grinder, grounds to machine, coffee to cup.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,833
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Thu Jan 17, 2013, 6:56am
Subject: Re: Factory brew pressure, to adjust or not to adjust?
 

I stay to right at 9 to 9.5 bar, regardless of the machine you pull the espresso with, pressure is pressure and the beans don't know who made the machine. If you don't like the taste, change the settings. If it is only channeling I would look at what you are doing in the prep of the shot.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 3,146
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4 x2, VDD...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Thu Jan 17, 2013, 7:17am
Subject: Re: Factory brew pressure, to adjust or not to adjust?
 

higher pressures may cause an overextraction of bitters.

 
.
Always remember the most important thing is what ends up in your cup!
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