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Bar Pressure vs. Grinder Setting
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vpasquan
Senior Member


Joined: 8 Dec 2012
Posts: 1
Location: Toronto
Expertise: I love coffee

Espresso: Brewtus IV Vibration
Grinder: Compak K3 Touch
Posted Sat Dec 8, 2012, 2:22pm
Subject: Bar Pressure vs. Grinder Setting
 

I'm a proud new owner of a Brewtus IV with Vibration pump and a Compak K3 Touch grinder.  Currently using Lavazza Red beans.  My OPV is set to 11 bar, as measured with a blind filter.

I'm pulling some great shots with the machine.  Using 16 grams, double basket, 2.5oz in about 30 second shot.  I'm using a calibrated 30lb tamper, so I know this is being tamped correctly.  The result:  Nice crema and great taste.

**I have one issue (maybe).  The bar pressure gauge on the Brewtus IV only gets up to around 4-5 bars during extraction. **


My question is, should I fiddle with grind, tamp, dose in order to get 9bar pressure during extraction.

- I tried increasing dose of grinds, but the coffee is too strong for me, so I want to keep that at 16g
- I tried making the grind finer, but the extraction time for 2.5oz was over a minute.  Bar pressure did creep close to 9bar.

Should I do anything or be happy with the 4-5bar extraction?  Would getting it to 8 bar actually improve my coffee?
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andys
Senior Member
andys
Joined: 10 May 2003
Posts: 856
Location: NY
Expertise: Just starting

Espresso: Speedster, Londinium 1
Grinder: EK-43,Robur, HG One, M3
Vac Pot: Yama
Drip: various
Roaster: PIDed Popper
Posted Sat Dec 8, 2012, 5:17pm
Subject: Re: Bar Pressure vs. Grinder Setting
 

vpasquan Said:

 My OPV is set to 11 bar, as measured with a blind filter....The bar pressure gauge on the Brewtus IV only gets up to around 4-5 bars during extraction....I tried making the grind finer, but the extraction time for 2.5oz was over a minute.  Bar pressure did creep close to 9bar.

Posted December 8, 2012 link

If you find the shots to be good as they are, there is little need to change. But it is possible, with experimentation, they could be even better.

A difference of 6-7 bar between static condition and flow condition means that something isn't right. Seems to me your normal grind is too coarse, and the one minute grind setting was obviously too fine. Can you find an intermediate setting that gets you 25-30 grams of liquid espresso from a 16 gram dose in 25-30 seconds?

 
-AndyS
picture page:  http://flickr.com/photos/andy_s/sets/
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