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marsel
Senior Member


Joined: 14 Sep 2013
Posts: 4
Location: NC
Expertise: Just starting

Posted Thu Sep 26, 2013, 7:19am
Subject: Gaggia Classic- Short Shots
 

I have Gaggia Classic for few weeks.
Double Shots are about 15 seconds long.
My understanding is I should be pulling double shots in  25-30 seconds.
Currently I'm using preground espresso.  
Baratza Preciso is on the way, should be here in a few days.
Anyhow my question is as follows:
Assuming tamping is correct, amount of coffee is correct, that leaves grinding size as a culprit. But as i was researching about Gaggia modifications it appears
that Classic has manufacturing pressure default at around 13 bars and it should be adjusted to 9-10 bars. My thinking is more pressure equals shorter a shots.
So before I I fine tune Grinder to proper ground size should i first adjust OPV?
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,026
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Sep 26, 2013, 8:15am
Subject: Re: Gaggia Classic- Short Shots
 

With or without OPV adjust, fresh roast of <2 week post roast date, freshly/immediately ground will help Gaggia work.  Adjusting the OPV will not fix any of that, but, it will make the machine a bit more tolerant of grind.  Fix the OPV as soon as you are comfortable working in the machine.

Click Here (coffeeforums.co.uk)(over-Pressure-Valve)-Gaggia-Classic

 
D4F also at
http://www.gaggiausersgroup.com/
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qualin
Senior Member
qualin
Joined: 30 Jun 2012
Posts: 665
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 Thu Sep 26, 2013, 2:45pm
Subject: Re: Gaggia Classic- Short Shots
 

marsel Said:

Currently I'm using preground espresso.

Posted September 26, 2013 link

That's your problem. Stop using preground coffee ASAP.

Espresso demands that you must grind your coffee and use it within 15 minutes after it is ground. This is extremely important.

Once you start grinding your coffee on demand, your shots will take as long as you want them to.

marsel Said:

that leaves grinding size as a culprit.

Posted September 26, 2013 link

There are four major factors which influence a shot. Grind coarseness, Shot dosage, type of coffee and coffee freshness.
You can control all of these things if you want to. Once you control these things, you will be able to control your shot times.  

marsel Said:

So before I I fine tune Grinder to proper ground size should i first adjust OPV?

Posted September 26, 2013 link

No. Do not adjust your brew pressure to compensate for shot times. The only time you want to adjust brew pressure is when you want to
change how you want your coffee to taste. Leave it at factory default for now and focus on getting your shot times to where you want them
by adjusting the factors which I listed above.

Good luck!

 
Garbage In, Garbage Out, for every step of the process. From Beans to grinder, grounds to machine, coffee to cup.
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jonr
Senior Member


Joined: 25 Jun 2013
Posts: 304
Location: Americas
Expertise: I love coffee
Posted Thu Sep 26, 2013, 4:46pm
Subject: Re: Gaggia Classic- Short Shots
 

I agree, start with good quality just ground coffee, a good grinder adjusted for the right grind, weigh your doses and tamp consistently.  Then you might look at an OPV adjustment and even a PID controller.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,026
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Sep 26, 2013, 7:59pm
Subject: Re: Gaggia Classic- Short Shots
 

I would go ahead and adjust the OPV since you have a Preciso arriving soon.  The OPV adjust will make the machine more tolerant, not make up for poor technique or beans.  I give you credit for knowing that as the "Preciso is arriving soon."  I would rather have the OPV adjusted and then use the Preciso than try with high brew pressure.  Why have to dial in the grinder twice, once for each OPV setting?

 
D4F also at
http://www.gaggiausersgroup.com/
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Iluvdabean
Senior Member
Iluvdabean
Joined: 7 Mar 2005
Posts: 1,282
Location: Kentucky
Expertise: I love coffee

Espresso: La Nuova Era Cuadra/Gaggia...
Grinder: Baratza Preciso/K-A Pro...
Drip: Bonavita BV 1800 TH
Roaster: Nesco 1010/Behmor 1600
Posted Fri Sep 27, 2013, 7:26am
Subject: Re: Gaggia Classic- Short Shots
 

Heres another thing also. The Preciso has internal adjustments that can be done to set the machine to a finer grind. So if the machine at its finest setting isnt fine enough
then I suggest following Baratza's advice. Its a very very capable grinder.

www.baratza.com


www.baratza.com/troubleshooting/

My Preciso canít get quite fine enough for my espresso machine, OR my Preciso is very fine at a setting of >10.


marsel Said:

I have Gaggia Classic for few weeks.
Double Shots are about 15 seconds long.
My understanding is I should be pulling double shots in  25-30 seconds.
Currently I'm using preground espresso.  
Baratza Preciso is on the way, should be here in a few days.
Anyhow my question is as follows:
Assuming tamping is correct, amount of coffee is correct, that leaves grinding size as a culprit. But as i was researching about Gaggia modifications it appears
that Classic has manufacturing pressure default at around 13 bars and it should be adjusted to 9-10 bars. My thinking is more pressure equals shorter a shots.
So before I I fine tune Grinder to proper ground size should i first adjust OPV?

Posted September 26, 2013 link

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