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Isomac Venus - pressure
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Discussions > Espresso > Machines > Isomac Venus -...  
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petr_cz
Senior Member


Joined: 6 Aug 2012
Posts: 12
Location: Haarlem NL
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Macap MC4
Posted Mon Oct 15, 2012, 11:00pm
Subject: Isomac Venus - pressure
 

Hello,

I have just bought Isomac Venus and I need help or some advise already at the beginning.
When I make espresso, the pressure is between 13 and 14 bars, which is too much, right? However the coffee is only dripping!!
What should I change? Did I do something wrong, or should I set up the machine??

Thank you!

Greetings,

Petr
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qualin
Senior Member
qualin
Joined: 30 Jun 2012
Posts: 665
Location: Calgary, AB
Expertise: I love coffee

Espresso: Izzo Alex Duetto 3
Grinder: Mazzer Mini Elect. Type A
Vac Pot: Looking to buy
Drip: Manual
Roaster: Considering?
Posted Tue Oct 16, 2012, 2:26am
Subject: Re: Isomac Venus - pressure
 

petr_cz Said:

When I make espresso, the pressure is between 13 and 14 bars, which is too much, right?

Posted October 15, 2012 link

Ideally, it should be at 9 bars for a proper extraction, but I don't know how to change it.

petr_cz Said:

However the coffee is only dripping!! What should I change? Did I do something wrong, or should I set up the machine??

Posted October 15, 2012 link

It sounds to me like you are choking the machine. Try using a coarser grind until you get 2 fluid ounces in about 25 seconds. Getting two 1 oz shot glasses will help.

I suspect, once you coarsen up the grind and get better flow, your manometer might read correctly.

Good luck!

 
Garbage In, Garbage Out, for every step of the process. From Beans to grinder, grounds to machine, coffee to cup.
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skispresso
Senior Member


Joined: 11 Nov 2007
Posts: 26
Location: Colorado
Expertise: I love coffee

Espresso: isomac venus
Grinder: macap m4 doserless
Posted Tue Oct 16, 2012, 7:13pm
Subject: Re: Isomac Venus - pressure
 

Hi Petr,

I also have an Isomac Venus and actually it came set around 11-12 bar, which they recommend.  If you are seeing 13-14 bar with only a drip, then I would adjust your grinder setting to slightly coarser.  I can get some really nice ristrettos at that pressure.  

I would work on grind adjustment first, before adjusting.  It can take some practice, but I think you are really going to enjoy the Venus once you get your grinder and dosing method to your liking.  

However, if you are curious there are some discussions here and in HB community.



"Isomac Venus extraction and manometer"

"Can the pump pressure on the Isomac Venus be adjusted?"

Click Here (www.home-barista.com)

this is a video on temp surfing which I also practice, and although featuring the Rancilio Sylvia the principle can apply to the Venus

https://www.youtube.com/watch?v=QhxvDusY3jk
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qualin
Senior Member
qualin
Joined: 30 Jun 2012
Posts: 665
Location: Calgary, AB
Expertise: I love coffee

Espresso: Izzo Alex Duetto 3
Grinder: Mazzer Mini Elect. Type A
Vac Pot: Looking to buy
Drip: Manual
Roaster: Considering?
Posted Tue Oct 16, 2012, 7:27pm
Subject: Re: Isomac Venus - pressure
 

skispresso Said:

I also have an Isomac Venus and actually it came set around 11-12 bar, which they recommend.

Posted October 16, 2012 link

My apologies, I should have done more research before I considered posting to this thread. I'll be a bit more careful next time.

 
Garbage In, Garbage Out, for every step of the process. From Beans to grinder, grounds to machine, coffee to cup.
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skispresso
Senior Member


Joined: 11 Nov 2007
Posts: 26
Location: Colorado
Expertise: I love coffee

Espresso: isomac venus
Grinder: macap m4 doserless
Posted Tue Oct 16, 2012, 7:42pm
Subject: Re: Isomac Venus - pressure
 

hey Qualin, no worries,  :) the 9 bar pressure seems to be more in line with most machines out there so a good thought there, Venus is just a little odd in that detail.

the grind suggestion seemed right to me, and I have also heard of folks who turn their Venus pressure to 9.5 with much success.

good coffee to you both!
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GVDub
Senior Member


Joined: 25 Jan 2008
Posts: 881
Location: Los Angeles, CA
Expertise: I live coffee

Espresso: Londinium I, Arrarex...
Grinder: Gaggia MD85, Dienes Mokka,...
Drip: Behmor Brazen, Abid Clever
Roaster: Behmor 1600+
Posted Tue Oct 16, 2012, 8:02pm
Subject: Re: Isomac Venus - pressure
 

If the machine is choked (which sounds like you're getting) the pressure reading is going to be showing roughly what the OPV (over pressure valve) is set to, since the coffee puck is, for all intents and purposes, impenetrable at that fine a grind. With the proper grind to get a shot flowing at the right rate, the pressure will drop to normal ranges. Even so, it sounds like you might need to get the OPV adjusted down just a a little bit as it should open between 11 and 12 bars, if that's what the manufacturer recommends.
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petr_cz
Senior Member


Joined: 6 Aug 2012
Posts: 12
Location: Haarlem NL
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Macap MC4
Posted Wed Oct 17, 2012, 12:01am
Subject: Re: Isomac Venus - pressure
 

Thanks a lot!
Will check the links, watch the video and set up the grinder.
...and practice :-)
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