Effects of brew pressure on taste of espresso - Page 2

Beginner or pro barista, all are invited to share.
User avatar
cafeIKE
Posts: 3083
Joined: Tue Jun 27, 2006 4:53 pm
Real Name: Ian Eales
Equipment: Elektra MXC, Macap MXK & MC4, Vibiemme Domobar DB & HX Super PID, UberHotTop
Location: Woodland Hills, CA

Postby cafeIKE » Sat May 14, 2011 10:49 am

innermusic wrote:Should I be calculating brew pressure or backwash pressure? (About 1/2 bar difference on my machine.)

If you don't know gauge accuracy, you're adjusting blind. When the gauge 'ages', you may adjust needlessly.
Lot's of experimenting w pressure, not profiling, many years ago led to the conclusion pressure is not crtical.
As Chris says, trust your taste.

PM me if you want borrow my gauge. You pay shipping & insurance. Both ways. :lol: .75kg

User avatar
innermusic
Posts: 446
Joined: Mon May 10, 2010 12:33 pm
Real Name: Steve Holt
Equipment: La Spaziale S1 Vivaldi II, Macap MXK, Baratza Vario, Aeropress, evolving taste buds...
Location: Toronto CANADA

Postby innermusic » Sat May 14, 2011 11:59 am

Didn't realize that gauge could be inaccurate - I figured a gauge measures pressure. Babe in the woods that I am. Anyway, this morning I dropped down to 8 from previous 9ish and the difference in taste was huge, and terrible. Then I pushed it up to 9.6 same coffee and tasted much better. Low pressure was more dry. Awful.

User avatar
cafeIKE
Posts: 3083
Joined: Tue Jun 27, 2006 4:53 pm
Real Name: Ian Eales
Equipment: Elektra MXC, Macap MXK & MC4, Vibiemme Domobar DB & HX Super PID, UberHotTop
Location: Woodland Hills, CA

Postby cafeIKE » Sat May 14, 2011 1:29 pm

8 on the gauge could be below 7 on the puck... yuck

User avatar
cannonfodder
Team HB
Posts: 8069
Joined: Mon May 23, 2005 8:20 am
Real Name: Dave Stephens
Equipment: Elektra A3, Faema, Gaggia Lever, LaCimbali the list goes on...
Location: Downingtown PA

Postby cannonfodder » Mon May 16, 2011 8:40 am

Machine gauges are notoriously inaccurate. The capillary tube that feeds the gauge connects pretty far upstream from the grouphead will also affect the reading. Before I had the scace I simply screwed a pressure gauge onto one of my spare portafilters. Do not take the onboard gauges as being an exact measurement, but a general reference point for changes. Adjust the machine to your taste.
Dave Stephens

User avatar
AndyS
Posts: 1059
Joined: Thu May 05, 2005 11:29 pm
Real Name: Andy Schecter
Equipment: 'Spro: Speedster, Silvia, Schectermatic Profiling Pump; Grinder: Robur, M3; Extractmojo
Location: NY

Postby AndyS » Mon May 16, 2011 8:04 pm

cafeIKE wrote:8 on the gauge could be below 7 on the puck... yuck


Doesn't that pressure regime describe most lever shots?
-AndyS
VST refractometer/filter basket beta tester, no financial interest in the company

User avatar
HB
Posts: 14652
Joined: Fri Apr 29, 2005 9:13 pm
Real Name: Dan Kehn
Equipment: La Marzocco Strada, Elektra Microcasa a Leva, Compak K10 WBC
Location: Cary, NC

Postby HB » Mon May 16, 2011 8:09 pm

No doubt that it would describe the majority of spring-powered lever espresso machines. I certainly wouldn't describe the espressos they produce as "yuck". In fact, for some coffees, I think spring-powered levers produce more nuanced, flavorful espressos than those produced by pump-powered machines.
Dan Kehn

User avatar
cafeIKE
Posts: 3083
Joined: Tue Jun 27, 2006 4:53 pm
Real Name: Ian Eales
Equipment: Elektra MXC, Macap MXK & MC4, Vibiemme Domobar DB & HX Super PID, UberHotTop
Location: Woodland Hills, CA

Postby cafeIKE » Mon May 16, 2011 8:28 pm

AndyS wrote:Does that pressure regime describe most lever shots?

Never measured pressure on lever.
Anything tried below 7 on a vibe pump was less than appealing.
Kinda a flat and 'oh so coffee'

The response was to a post with a vibe machine

our caffeinated commitment to you
User avatar
AndyS
Posts: 1059
Joined: Thu May 05, 2005 11:29 pm
Real Name: Andy Schecter
Equipment: 'Spro: Speedster, Silvia, Schectermatic Profiling Pump; Grinder: Robur, M3; Extractmojo
Location: NY

Postby AndyS » Tue May 17, 2011 6:40 am

cafeIKE wrote:Kinda a flat and 'oh so coffee'


Espresso that tastes like coffee? Disgusting.
-AndyS
VST refractometer/filter basket beta tester, no financial interest in the company

aecletec
Posts: 478
Joined: Wed Dec 29, 2010 6:12 am
Real Name: Chris
Equipment: ROK, Anfim Super Caimano Standard
Location: Australia

Postby aecletec » Tue May 17, 2011 8:01 am

AndyS wrote:Espresso that tastes like coffee? Disgusting.

I'm not sure about 'oh so' coffee (or what that is), but 'so so' coffee I can empathise with.

User avatar
HB
Posts: 14652
Joined: Fri Apr 29, 2005 9:13 pm
Real Name: Dan Kehn
Equipment: La Marzocco Strada, Elektra Microcasa a Leva, Compak K10 WBC
Location: Cary, NC

Postby HB » Wed May 18, 2011 3:03 pm

Split follow-on discussion to Brew pressure gradient of espresso.
Dan Kehn