Effects of brew pressure on taste of espresso - Page 2

Beginner or pro barista, all are invited to share.
User avatar
cafeIKE
Posts: 3077
Joined: Tue Jun 27, 2006 4:53 pm

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

expert repairs with an Italian touch
Sponsored by EspressoCare - expert repairs with an Italian touch
User avatar
innermusic
Posts: 452
Joined: Mon May 10, 2010 12:33 pm

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.
Steve Holt
Trent Hills, Ontario Canada
Vivaldi II, Macap MXK, Baratza Vario

User avatar
cafeIKE
Posts: 3077
Joined: Tue Jun 27, 2006 4:53 pm

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: 8678
Joined: Mon May 23, 2005 8:20 am

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: 1058
Joined: Thu May 05, 2005 11:29 pm

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
Admin
Posts: 16245
Joined: Fri Apr 29, 2005 9:13 pm

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: 3077
Joined: Tue Jun 27, 2006 4:53 pm

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

coffee & espresso equipment and accessories
Sponsored by Prima Coffee - coffee & espresso equipment and accessories
User avatar
AndyS
Posts: 1058
Joined: Thu May 05, 2005 11:29 pm

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

User avatar
aecletec
Posts: 1267
Joined: Wed Dec 29, 2010 6:12 am

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
Admin
Posts: 16245
Joined: Fri Apr 29, 2005 9:13 pm

Postby HB » Wed May 18, 2011 3:03 pm

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