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The two stream shot...that was good!
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DeanOK
Senior Member
DeanOK
Joined: 24 Sep 2012
Posts: 649
Location: OK
Expertise: I like coffee

Espresso: QM Vetrano 2B
Grinder: Vario W
Posted Tue May 27, 2014, 4:40pm
Subject: The two stream shot...that was good!
 

Had an early evening latte.... Using my naked PF, I frequently have my "two streams" to last nearly half way through the shot, but I never have them stay in there for the entire shot... until tonight. I don't know why this one was different, but I had two distinct streams through the entire shot... but the shot was great... top 10 percent for sure. My yield and shot time were exactly what I shoot for.

Anyone else have this experience or have a comment?
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marosmith
Senior Member
marosmith
Joined: 15 Dec 2013
Posts: 85
Location: Lafayette, Oregon
Expertise: I love coffee

Espresso: NS Oscar, Silvia V2
Grinder: NS MCF, Baratza Encore
Posted Tue May 27, 2014, 5:27pm
Subject: Re: The two srtream shot...that was good!
 

DeanOK Said:

Had an early evening latte.... Using my naked PF, I frequently have my "two streams" to last nearly half way through the shot, but I never have them stay in there for the entire shot... until tonight. I don't know why this one was different, but I had two distinct streams through the entire shot... but the shot was great... top 10 percent for sure. My yield and shot time were exactly what I shoot for.

Anyone else have this experience or have a comment?

Posted May 27, 2014 link

I have had the two stream shots as well with my oscar, more so than with my old silvia. They seem to taste just as good and not totally sure what causes them.
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boar_d_laze
Senior Member


Joined: 21 Nov 2006
Posts: 1,102
Location: Monrovia, CA
Expertise: I live coffee

Espresso: La Cimbali M21 DT/1 Junior...
Grinder: Ceado E92; "Bunnzilla"
Vac Pot: Royal Coffee Maker
Drip: Chemex + Kone; Espro Press
Roaster: USRC Sample Roaster
Posted Tue May 27, 2014, 6:19pm
Subject: Re: The two srtream shot...that was good!
 

You can't argue with good results, so take it FWIW:

Multiple streams which persist more than half way through the shot are almost always sign of channeling caused by uneven distribution, a bad tamp, or a wet basket.  Channeling usually means some degree of under extraction.  

If you're getting good shots then it's possible the under extraction is balanced by a corresponding over extraction; something which could result -- by way of example only -- from brewing too hot.  

Multiple streams are not, in and of themselves, proof of under extraction.  A simple and and absolutely conclusive test is looking at the color of the streams as well as at the bottom of the pf during the shot.  If either or both of the streams are light colored and there's little to no striping on them or their cones, then the under extraction is confirmed.

If multiple-stream shots are your best shots, you might want to think about adjusting your future technique toward lower extraction by brewing cooler, dosing higher, and/or grinding coarser -- while perfecting your distribution and puck building.  

Rich
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