[Homeroast] Re : Sour espresso taste

denis bordeleau bomerlo at yahoo.ca
Mon Jun 4 16:32:37 CDT 2012

Hi Mike,    I'm only 5 but I'll try answering that one. I have a Rancilio Sylvia.        From what you said it appears you have 2 problems: sour taste and cold water in the cup.  Sour taste can be because of rancid oil accumulation and minerals.  So, clean both of your machine and decalcify them.  Temperature problem will  probably  be solved.  Check your chain of  T°. If you have steam ­in the wand and 168 degrees in the cup you have a loss in between. Keep your porta filter hot and panty (not in the freezer), warm the cup and try bigger size than ristretto.  Clean the grinders with instant  minute rice to get rid of sour tasting oil by cleaning the burrs.  Be sure the blend is OK by trying another extraction and grinding method.   For cleaning, backwash and decalcifying method on the Gaggia New Baby and Classic models, go with the instructions book or the mighty list will come to your help.    I wish you good luck and a
 very nice evening


 De : Mike Wilkens <mike.wilkens at gmail.com>
À : homeroast at lists.sweetmariascoffee.com 
Envoyé le : samedi 2 juin 2012 2h36
Objet : [Homeroast] Sour espresso taste
Does anyone have hints on temperature surfing the Gaggia Classic?  I saw the earlier posts from 2006 on this subject, tried what was detailed there, didn't work for me.

My shots are very consistent in taste, problem is they're all extremely sour tasting.  I've used four different beans, two different grinders, two different espresso machines (New Baby and Classic).  To raise the brew temp, I draw water (PF off) until the heating element goes on, install PF, wait until heating element goes on, wait 6 s, and pull.

Unless I'm preparing it with coffee, the PF is installed at all times.  30 minutes warm up.

Also tried turning on steam switch for 10 seconds just before pulling the shot, all other parts of surfing ritual the same.  No difference.  Coffee temp in the cup was 168*F +- 2*F.

Of course I've also tried just walking up to the machine and pulling.  No difference.

I've ground fine enough that 2 drops of coffee come through, but if I get coffee it's extremely sour tasting.

To my untrained eye, the crema usually appears tan and not chocolatey brown, which I'm told signifies underextraction.  Also to my untrained eye, the flow of the shot appears to go from dark dark brown straight to blond, without going through that reddish brown phase.  Suspecting channelling, I added another ritual sometimes called the Weiss Distribution Technique but could also be called Stirring with a Paperclip.  No difference.

Next step is to find a 6 year old child...


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