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Gaggia Classic Pressure test issues?
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toyman
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Joined: 30 Oct 2012
Posts: 48
Location: PA
Expertise: Just starting

Espresso: Expobar Office Lever Plus,...
Grinder: Baratza Preciso
Drip: Cuisinart
Posted Thu Apr 25, 2013, 6:38am
Subject: Gaggia Classic Pressure test issues?
 

I've been searching and haven't found any posts with my issue.  I connected a pressure guage to my portafilter last night.  Let the machine warm up and tried to take a reading.  It leaked thru the top of portafilter?  I had just cleaned the shower screen and thought that I may have disturbed the gasket, so I put my blind basket in and, everything was fine?  I put the double basket in and water was coming out of the top of the portafilter.  Grabbed some beans and ground and tamped and pulled a shot.  No leaks????  Put the gauge back on the PF and leaks?  Would not give a pressure reading.  The double basket was in place when I put the PF on.  Any thoughts?
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dyqik
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Joined: 7 Oct 2011
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Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
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Roaster: Gene Cafe, Modded Poppers
Posted Thu Apr 25, 2013, 8:04am
Subject: Re: Gaggia Classic Pressure test issues?
 

With the pressure gauge in place, you need a seal between the basket and the PF as well as between the basket and the gasket - normally the pressure is contained by the coffee grounds and the basket, but with no grounds, the PF body is the part that has to be sealed to the group and that has to hold the pressure.  The PF may have cut outs in the edge under the basket lip, or there could just not be a good seal there.  If there's no cutout, try cleaning the inside of the basket lip and putting some teflon tape on the PF edge.  Otherwise, you'd be best to do the test without the basket in place if you can get a good seal that way.

Also, the blind pressure (i.e. when the PF is terminated by the gauge) will be higher by at least a bar (and possibly more) when brewing a shot.  This could be enough to cause the leak between the basket and the gasket that doesn't appear normally.
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brianl
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Joined: 1 Dec 2012
Posts: 441
Location: Chicago IL
Expertise: I love coffee

Espresso: Gaggia Classic (w/PID)
Grinder: Baratza Vario
Drip: chemex
Posted Thu Apr 25, 2013, 8:37am
Subject: Re: Gaggia Classic Pressure test issues?
 

Agreed with above poster. You should remove the basket and test just the portafilter. It should read 10 bars.

Don't know what youre talking about not finding any posts with the issue because it's a commonly documented process.
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D4F
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Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Apr 25, 2013, 9:32am
Subject: Re: Gaggia Classic Pressure test issues?
 

Agree, no basket.  The leak is between the basket and PF.  Of course the PF without the basket will rotate farther around to lock and may not seal as easily as the basket, different lip shape.  10 - 10.5 bar static and that will be about 9 bar in use.  You can add a valve to the PF gauge plumbing and set the leak to about simulate your brew rate and set to 9 bar.

 
D4F also at
http://www.gaggiausersgroup.com/
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toyman
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Joined: 30 Oct 2012
Posts: 48
Location: PA
Expertise: Just starting

Espresso: Expobar Office Lever Plus,...
Grinder: Baratza Preciso
Drip: Cuisinart
Posted Thu Apr 25, 2013, 6:40pm
Subject: Re: Gaggia Classic Pressure test issues?
 

brianl Said:

Don't know what youre talking about not finding any posts with the issue because it's a commonly documented process.

Posted April 25, 2013 link

Let me explain, I searched specifically for a leaking portafilter while pressure testing and found no posts that specifically addressed my situation. I did however find info on the yahoo board that specified that the basket needed removed. I hope that is more understandable?

To everyone else thank you for the feedback.  I got the pressure gauge connected and reading appropriately. You definitely don't want the basket in place and you need to make sure the PF is tight. From many searches, I also found that a lot of posters recommend adjusting the OPV 270* CC will get you close. My unit was close to 16 bar before adjustment. I made the 270* adjustment and it was at a solid 10.5 bar. Not saying that it will work for all but it was pretty accurate for my unit.   Thanks again!
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Apr 25, 2013, 8:22pm
Subject: Re: Gaggia Classic Pressure test issues?
 

Good to hear that it all worked.  Have you done the Silvia V1 wand yet?  The OPV is a great mod for brew and makes the Classic much easier to use.  Silvia wand is similarly helpful for steam.  And then PID.....

 
D4F also at
http://www.gaggiausersgroup.com/
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toyman
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Joined: 30 Oct 2012
Posts: 48
Location: PA
Expertise: Just starting

Espresso: Expobar Office Lever Plus,...
Grinder: Baratza Preciso
Drip: Cuisinart
Posted Fri Apr 26, 2013, 3:53am
Subject: Re: Gaggia Classic Pressure test issues?
 

I have not done the wand upgrade yet.  I'm kicking around it and PID, but haven't pulled the trigger yet. Getting ready to pull a few shots with the lower pressure and hoping for great results!  

Got the grind dialed in and a big step forward. No sourness at all. I have fresh roasted dark espresso and it is strong. Not bitter, strong. The difference in flavor is amazing.
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D4F
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Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri Apr 26, 2013, 8:49am
Subject: Re: Gaggia Classic Pressure test issues?
 

toyman Said:

I have fresh roasted dark espresso and it is strong. Not bitter, strong. The difference in flavor is amazing.

Posted April 26, 2013 link

Dark meaning roast, what beans are you using?

 
D4F also at
http://www.gaggiausersgroup.com/
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toyman
Senior Member


Joined: 30 Oct 2012
Posts: 48
Location: PA
Expertise: Just starting

Espresso: Expobar Office Lever Plus,...
Grinder: Baratza Preciso
Drip: Cuisinart
Posted Fri Apr 26, 2013, 6:40pm
Subject: Re: Gaggia Classic Pressure test issues?
 

Yes, very dark roast. It's a local roast from the Strip District in Pittsburgh, if your familiar.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri Apr 26, 2013, 8:11pm
Subject: Re: Gaggia Classic Pressure test issues?
 

You have made your machine easier to use.  Not wanting to overstep the thread, but you may want to try something like Redbird Espresso or Redbird Blue Jaguar.  Easy to obtain by USPS and easy to brew.  Fairly known and consistent, and often recommended on CG.  I use both.

 
D4F also at
http://www.gaggiausersgroup.com/
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