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Foam in bottom of portafilter/puck

Postby buzzmc on Sun Nov 08, 2009 1:14 pm

Recently my espresso has been suffering and the title basically says it all.

The espresso is thin and lacks crema, whatever crema I do get is extremely light in color, and there's usually 1-2 places on the puck and in the pf that appear 'foamy' to me.

Any clues would be most helpful
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Postby HB on Sun Nov 08, 2009 1:23 pm

Sunday's a good day for an espresso puzzler, especially one with such a tantalizing title. Would you post a video?

Without more details, I'll start by saying that I hold very little regard for puckology. Firm pucks, soft pucks, squishy wet pucks, they're all fine by me as long as they're consistent. Foaminess could be a sign of excessive degassing, e.g., if the coffee is 1 or 2 days post-roast. Extremely fresh coffee can be more difficult to manage too, channeling, running thin / blonding early, etc. One trick that others have told me works is to let super-gassy coffee "age" in the doser. Yep, we always rail on Italians that dose a half-hour's worth of grounds into the doser, but I have it on good authority that letting the coffee degas post-grinding will help ultra fresh coffee settle down.

Other than these puckology comments, I can only offer general diagnostic comments that you will find in plenitude with a bit of searching the FAQs (e.g., fresh coffee, proper degassing, burrs are sharp, etc.).
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Postby buzzmc on Tue Nov 10, 2009 12:18 pm

if video's from an iPhone will suffice I can provide said video... But I'm not so sure the quality is going to be that useful... But I imagine at least people will get the idea of what the pull/shot looks like. I don't know that the "foam" on the bottom of the puck or in the PF will be visible however.

I suppose the good news is that its consistent. The bad news is of course that its not particularly good, tho still better than most coffee shops... But no where near moderately decent espresso.
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Postby Beezer on Tue Nov 10, 2009 2:31 pm

What kind of beans are you using? Are they fresh? What kind of grinder?

Do you have a bottomless portafilter to help diagnose problems with dose and distribution? Posting a video of a bottomless shot would probably be the most helpful way to diagnose the problem. I imagine an iPhone video would be OK, assuming you can see what's going on.
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Postby malachi on Tue Nov 10, 2009 2:49 pm

More details would help.
In particular:
- what is the coffee you are using?
- how old is it? (since roast, not since you bought it)
- what grinder are you using?
- you say "recently" which would indicate that this used to NOT be the case. what has changed?
"Taste is the only morality." -- John Ruskin
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