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Should espresso stream accelerate during the extraction?
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rwj
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Joined: 10 Feb 2011
Posts: 13
Location: Erie, PA
Expertise: Just starting

Posted Sat Aug 11, 2012, 2:43pm
Subject: Should espresso stream accelerate during the extraction?
 

Or is this pathological?

Basically, my stream seems to speed up about 2/3 of the way through the extraction. Right around 20sec, say.

When I watch the machines at my favorite cafes, the rate of pour seems constant throughout the extraction. Its color looks a bit more uniform as well.

Or am I overanalyzing?
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FrankyD
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Joined: 27 Jul 2012
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Location: Davis, CA
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Posted Sat Aug 11, 2012, 11:00pm
Subject: Re: Should espresso stream accelerate during the extraction?
 

I think you mean to say psychological.

What machine are you using?
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rwj
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Joined: 10 Feb 2011
Posts: 13
Location: Erie, PA
Expertise: Just starting

Posted Sat Aug 11, 2012, 11:41pm
Subject: Re: Should espresso stream accelerate during the extraction?
 

Gaggia Classic with few-days-old beans. Double ristrettos, mostly.
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emradguy
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emradguy
Joined: 31 Mar 2011
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Posted Tue Aug 14, 2012, 9:53am
Subject: Re: Should espresso stream accelerate during the extraction?
 

sounds like your grind might be too coarse to me, but you haven't given a lot of info.  perhaps you could post a video of your extraction?

 
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Always remember the most important thing is what ends up in your cup!
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jkoll42
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Joined: 2 Jan 2010
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Posted Tue Aug 21, 2012, 11:07am
Subject: Re: Should espresso stream accelerate during the extraction?
 

rwj Said:

Gaggia Classic with few-days-old beans. Double ristrettos, mostly.

Posted August 11, 2012 link

I found that with very recently roasted beans when I had my Gaggia the cone would get wider at the point you are describing.  It made it look like it was pulling faster but I think it was just more co2 pulling out near the end of the extraction.  It didn't seem like the volume was increasing.  Not sure if this is what you are seeing or not.
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