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pressure profiling (sort of)..... now I get it
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nygel74
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Joined: 2 Jan 2006
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Location: USA
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Posted Fri Nov 22, 2013, 9:10am
Subject: pressure profiling (sort of)..... now I get it
 

well, I just picked up a newer pump and bypass assembly for my beloved bz99 and since today has been declared a 'Mental Health day":) no better time to tinker with it.  long story short, after getting the pump in and realizing that my brew head pressure gauge has given up the ghost, I was just having some fun pulling some shots and playing with variables.  The pump I picked up from a fellow cg'er had a large bypass with the valve adjustment on the bottom, and because of space requirements, that adjustment nut had to be mounted facing the back of the machine.  The last couple shots I pulled I was playing with the adjustment during the shot....lessening the pressure at the beginning, ramping up towards the middle, and a slow ramp down towards the end.  I get it now.  Pressure profiling opens up so many more flavors and almost a whole other dimension to pulling an espresso shot.  Rather then the grind tamp pull, I felt like I was manipulating the espresso all the way to the cup.  I get it, and now I want more of it :P  Just thought I would share my lightbulb moment!!!


....nygel74
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calblacksmith
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calblacksmith
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Espresso: ECM Vene. A1, La Cimbali M32
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Roaster: gave it a try, decided no
Posted Fri Nov 22, 2013, 10:39am
Subject: Re: pressure profiling (sort of)..... now I get it
 

Let phase two begin! .... or is that phase 3 ??? LOL!
Congrats on the "discovery", it will be some time before I get a machine that makes it easy to profile, I just cant afford it but I sure would like to play with it!

 
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Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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nygel74
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Joined: 2 Jan 2006
Posts: 46
Location: USA
Expertise: I live coffee

Posted Fri Nov 22, 2013, 12:31pm
Subject: Re: pressure profiling (sort of)..... now I get it
 

I hear ya.  Even though this was totally a fluke, I kind of got a glimpse of what its really all about.  I can't profile on this machine, and settles on a pressure, set it, and re assembled it, but the bug is definitely there.  Read a lot bout light dimmers and vibe pumps etc? I'm certainly interested.
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jonr
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Joined: 25 Jun 2013
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Location: Americas
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Posted Mon Dec 2, 2013, 10:09am
Subject: Re: pressure profiling (sort of)..... now I get it
 

I've modified my vibratory pump machine to produce automated flow/pressure profiles and recommend it.  Especially since I haven't gotten very far on determining what profiles are best (ie, more people doing it would help).
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nygel74
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Joined: 2 Jan 2006
Posts: 46
Location: USA
Expertise: I live coffee

Posted Mon Dec 2, 2013, 12:44pm
Subject: Re: pressure profiling (sort of)..... now I get it
 

Got a vid or pics or the mod? Would be very interested in learning how u did it
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jonr
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Posted Mon Dec 2, 2013, 3:33pm
Subject: Re: pressure profiling (sort of)..... now I get it
 

http://coffeegeek.com/forums/espresso/machinemods/638206

You can also add a variac to a vibe pump for manual control.  Might work well when combined with a pressure gauge (like a direct lever machine but less work).
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