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Gaggia pressure problem and subsequent fix
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Discussions > Espresso > Machines > Gaggia pressure...  
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CraigA
Moderator
CraigA
Joined: 19 Dec 2001
Posts: 11,172
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Tue Feb 27, 2007, 6:04pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

I can set for stagnation (blind) or dynamic pressure, simulating a shot., or pulling a real shot & measuring exact extraction brew pressure. Stagnation or static (blind) pressure for a Silvia, although not the best way to measure it., should be set for 10 - 10.5 bars & for a dynamic simulated or real shot, the pressure set to 9 - 9.5 bars., (1 bar lower to account for dynamic {running} pressure drop) depending on your particular espresso blend recommendations (temp @ grouphead & extraction pressure).

Quote from my alt.coffee post on this: Click Here (groups.google.com)

"Well, I just KNEW that there was gonna be a hell of a difference in the
shot quality of the Black Cat that I'm using. On my May 2001 Rancilio
Miss Silvia, the OPV valve pressure that I didn't know what is was till
Fri Feb 23/07 when I completed my portafilter pressure assembly with
needle bleed valve., is/was 170 psi! or 11.6 bars. So my readjusted
dynamic pressure is 135 - 140psi, a drop of 30 - 35psi or 2.04 -
2.38/2.4 bar. Quite significant IMO.

VERY MUCH sweeter tasting, smoother, no harshness, no blonding, & due to
the lower extraction pressure drop from 17.7% - 23.5%., & from my
previous grinder setting I had to go 3 notchs coarser or approx 30%.

The very first shot I forgot to readjust my grinder & pulled a very
sweet, intense ristretto 1oz with 16 - 17 grams of Black Cat., slightly
under dosed La Marzocco style (Ascaso of Spain) ridgeless double basket.
Second re-adjusted shot was right on the money, same basket., 18 grams
of BC & 1.8 - 2oz.

Brad Ford, the Canadian Intelligentsia rep for Canada recommends &
Chicago Intelly recommends running 199.5F/~93C at the grouphead for
Black Cat, roughly the same for KidO. They use a Cirqua system to get
the water close to SCAA spec and run the pumps dialed back to about 8.2
bar as well. That's what they were running at the Toronto HostEx show as
well on a brand spanking new La Spaziale Vivaldi S1.
http://www.hostexshow.com/

I was running 198 - 199F at the grouphead & a little more than 1 bar
more pressure (1.3bar more). I wanted to err a little on the high than
low pressure side.

I PID'd my machine on June 24th 2006, & the new Rancilio OPV on Sun Feb 25th 2007,
dam I WISH I had'a done., or had the money to do the pressure mod then!
Cheers,
Craig."


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Jeff_K
Senior Member
Jeff_K
Joined: 7 Jul 2005
Posts: 1,589
Location: Chicago
Expertise: I love coffee

Espresso: LaCimbali Junior D/1,...
Grinder: LaCimbali Junior, Rio...
Drip: Presto Scandinavian, Bodum...
Roaster: Hottop KN8828, Kitchen...
Posted Wed Feb 28, 2007, 8:11am
Subject: Re: Gaggia pressure problem and subsequent fix
 

Nice pictures and explanations - I'll have to try and find something similar and then assemble the brass fittings myself since that seems to be a great idea compared to what is being sold for testing pressure.  The Gaggia valve fix is pretty interesting as well and maybe I'll open mine up and check that out.
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4_40saved
Senior Member


Joined: 10 Mar 2007
Posts: 4
Location: Gwinnett CountyGA
Expertise: Just starting

Posted Sat Mar 10, 2007, 10:44am
Subject: Re: Spresso_Bean
 

Jeff K
I am a newbie @ the espresso experience. I just opened my refurb Gaggio Evolution WLL and new Gaggio MM grinder (with no instructions?).
I noticed you had the same setup at one time.
Would you be willing to answer some questions I have compliled so far?
I know one mistake I am already making is using *$ espresso beans. Unfortunately i bought them b4 reading up on the art. My wife has been buying 2 venti latte a day. Thought *$ was the way to intro the home process.
hope to hear from you
Dean
GA
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mtb_chris
Senior Member
mtb_chris
Joined: 12 Nov 2004
Posts: 12
Location: Idaho, USA
Expertise: I love coffee

Espresso: Gaggia Evolution
Grinder: Innova i2 / Capresso...
Drip: Kitchenaid Ultra 4
Posted Sat Mar 10, 2007, 12:47pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

Update:

The nice 9-bar pressure I was getting has gone away, and now the machine is back up to about 12 bars (stalled) with the OPV backed out all the way.  This is completely inexplicable because I have not modified the machine at all.  I blame gremlins.
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4_40saved
Senior Member


Joined: 10 Mar 2007
Posts: 4
Location: Gwinnett CountyGA
Expertise: Just starting

Posted Sat Mar 10, 2007, 12:59pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

Chris
Does your evolution drip after pulling a shot?
The machine is still on and the brew button is off. It's almost like
a steam release of sorts. The PF is still in place, so espresso (i'm new so i'll use that term lightly) will drip onto the drip plate. I just bought this refurb from WLL and have a small window to make sure it's running correctly.

For a 2oz pull, maybe 1% of it is crema color. I see these pics of what crema is and I realize I am far from that.
Dean
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stevier
Senior Member


Joined: 4 Jan 2008
Posts: 157
Location: So. California
Expertise: I love coffee

Espresso: Expobar Office Control,...
Grinder: Rancilio MD-50
Drip: Aeropress
Roaster: HG/BM
Posted Sat Jan 5, 2008, 2:08am
Subject: Re: Gaggia pressure problem and subsequent fix
 

How do you solder the copper to the stainless basket?  I've worked with copper pipe before, soldering fittings - but I'm not sure how this would work.  Is there special equipment and/or solder needed?  Any tips on making such a connection?  I'm working on a pressure gauge this weekend, and will be figuring out how to connect to a blank filter basket next week.
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CraigA
Moderator
CraigA
Joined: 19 Dec 2001
Posts: 11,172
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Sat Jan 5, 2008, 3:14pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

stevier Said:

How do you solder the copper to the stainless basket?  I've worked with copper pipe before, soldering fittings - but I'm not sure how this would work.  Is there special equipment and/or solder needed?  Any tips on making such a connection?  I'm working on a pressure gauge this weekend, and will be figuring out how to connect to a blank filter basket next week.

Posted January 5, 2008 link

Hi Steve,

Welcome to the coffeegeek forums! {;-)

I got your email, but I'll answer here. Nothing special, I used a handymans/plumbers standard propane torch & Kesters Silver Solder.

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stevier
Senior Member


Joined: 4 Jan 2008
Posts: 157
Location: So. California
Expertise: I love coffee

Espresso: Expobar Office Control,...
Grinder: Rancilio MD-50
Drip: Aeropress
Roaster: HG/BM
Posted Sun Jan 6, 2008, 1:39am
Subject: Re: Gaggia pressure problem and subsequent fix
 

Great, thanks for the tip, I'll give it a try when my blank disc gets in.  

I've been reading the forums for quite a while, but I guess that was my virgin post.  I am working on restoring a older Gaggia Baby I found on craigslist for cheap - completely torn apart right now, waiting for a rebuild kit on its way from italy :).  Can't wait to get it running and finally be able to make great espresso (i've been using, or should I say trying to use, a cuisinart burr grinder and older krups espresso machine for about two years, so the gaggia and rocky are such an upgrade :) )
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Iluvdabean
Senior Member
Iluvdabean
Joined: 7 Mar 2005
Posts: 1,217
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 Sun Jan 6, 2008, 6:20pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

So does that mean that "ALL" Gaggias run with this high of pressure? Would a new Baby or Calssic also run at this pressure? Just Curious?
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Iluvdabean
Senior Member
Iluvdabean
Joined: 7 Mar 2005
Posts: 1,217
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 Sun Jan 6, 2008, 6:24pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

So does that mean that "ALL" Gaggias run with this high of pressure? Would a new Baby or Classic also run at this pressure? Just Curious?
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