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No matter what I do, I get channeling! - Page 3

Postby GriffDeLaGriff on Sun Feb 14, 2010 2:55 pm

It got darker after editing so its hard to see.
Turn up your brightness a few notches or watch in fullscreen.

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Postby JmanEspresso on Sun Feb 14, 2010 10:04 pm

Honestly.. That doesn't look bad at all, except, that you let it run too long. Notice how there wasn't any spray until after the cone collapsed and the shot had already blonded? Around 28-29sec, is where Id have stopped it. After this point, you can the cone has collapsed, the stream has turned thin, and it is blonding. This is why you're seeing the spraying.

I would suggest dosing 17-18grams.. And dial it in, so that it beads the same.. The shot shouldnt speed up as much as it did in the video, running a higher dose. More coffee in the basket, more goodness to extract, more time it takes. What surprised me at first, is how slow it beaded, but then how fast it sped up shortly into the extraction. Then i remembered, I would see this behavior when running low doses on my E-61. At 14grams, there is a lot of headspace, AND the coffee has extracted quicker, then if you're running a 17-18gr dose. So, the cone breaks down quicker, and it blondes quicker. The shot time of ~29sec, is about right for a 14gram dose, even pulled slightly ristretto. Most people who own E-61s(and other machines too), run 18gram doses, +/- a gram or two. 18gr was where I pulled 90% of my shots, and it was not at all uncommon to stuff 20gr in the basket. What was uncommon(meaning it almost never happened, was doses below 16grams)

The only other thing that pop in my head as to why it sped up is:

-Brew pressure too high. IDK if your machine has a brew pressure gauge. If it does, it should read 9Bar during the extraction. If it DOESNT have a gave, you'll need to construct one out of a spare portafilter, and adjust the brew pressure down to 8-9Bar. Too high of a brew pressure would also explain that "noise spike", at the 20sec mark in the video.

Though, .. Unless your pressure is set above 10Bar(which, it could be, Ive seen machine set at 12-13B from the factory), thats still in the ballpark, and acceptable. Most prefer between 8.5-9B, but 8-10B is generally accepted as the range.


Try this: Dose at 17grams. Dial in the grind, so the shot beads like it did in the video(roughly, it doesnt have to be scientifically identical), and stop the shot JUST as the cone breaks down, before it blondes(which would be, in the video, 28-29sec). You should then get an extraction which runs slower, and lasts a bit longer. You wont stop at the same TIME, but you will stop at the same COLOR.
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Postby JmanEspresso on Sun Feb 14, 2010 10:12 pm

Now that I read my post.. I want to add something.

Aside from letting the shot run longer then it should.. that was a nice extraction. So, BEFORE you change your dosing.. Keep it how it is, and stop the shot sooner(28-29sec, from that video). Because, there was no spraying or channeling up to that point, and looked like it probably would tasted quite nice.

Also, looking at when you show the basket in the video, full of coffee.. I think you'll have a tough time getting 18grams in there, without hitting the shower screen. 16grams is definitely doable in the Faema "14gr" baskets, and some coffees you can get 17gr, but it's tight. IF you want to experiment with doses higher the 16gr, a Ridgeless Double basket is what you want.

One more thing: Forget about volume in the cup. Stop the shot on color. When the color starts to lighten, and the cone collapses, kill it. Color is the best way to judge when to stop the shot. Time and Volume aren't going to be the same every time.. they'll differ under all circumstances. So, even if you only have about an ounce in the cup, stop the shot when the color tells you too. The whole 25sec/2oz golden rule, IMO, needs to be squashed...because its not a rule at all, and doesnt do a whole lot to help one get where they want to be.
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Postby GriffDeLaGriff on Mon Feb 15, 2010 3:05 am

Thank you so very much for the reply.

I will try everything you say and get back here with the results.
I do have a slightly larger basket that came with the machine
so I can try higher dose.

Problem is Its actually spraying before 29seconds.
If you look at 18-28s on the left side of the cup.
Even if I almost choke the machine this happens.
I can never get a drinkable amount without having to
wipe away grinds from the cup.

Im hoping it will minimize as I up the dose and it could very well
do so. I have had minimal spraying on occasion and my standard
measure have always been level with the top and thats about 16g
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Postby JmanEspresso on Mon Feb 15, 2010 3:24 am

The constant spraying, sounds like the brew pressure is probably too high. You dont need to make a gauge to adjust it, but to do it with any idea what changes are being made, you should have a gauge. BUT, you can always adjust by taste, and even with a gauge, thats what you will do.
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Postby geoffbeier on Mon Feb 15, 2010 3:35 am

GriffDeLaGriff wrote:Problem is Its actually spraying before 29seconds.
If you look at 18-28s on the left side of the cup.
Even if I almost choke the machine this happens.
I can never get a drinkable amount without having to
wipe away grinds from the cup.


Out of curiosity, is your basket dry before you load it with your dose? Your results look similar to what I saw before I learned to dry the basket.
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Postby GriffDeLaGriff on Mon Feb 15, 2010 5:35 am

I again want to say thanks so very much for taking the time to help me.
What you guys say is invaluable and every time I come back
I read something that gives me that warm cuddly feeling inside (hope)
Not just this thread but many places on the forum. Great place this is.

I only had one more shot with that blend so I wanted to try higher dose.
Same grind at 17g almost choked but it sprayed minimal and in 1 minute
I got a single that was very interesting taste :mrgreen:

So I put in the ethiopian from cafe fresco and gave it a try at 17g
and it came out alright. Not too much spray but it ran too slow.
The shot was sweeter then Im used to, and very strong.

It is looking a little brighter. Looks definitely like higher dose is
the way to go. Looking back, I always used to level with the basket
and it didnt use to spray so much, but still some.
I was too coarse then and a full basket gave me about 16g.
I was trying to test different doses and this is what lead me in the wrong path
I believe. I was a little blind trusting the scale and golden rule.

Im hoping it wont spray as I shorten the timing with 17g (now its over a minute for 1.25oz)
but I will try with the ethiopian later on.


I have that gauge you see in the video, but thats not it, is it?

It says bar in white and psi in red.
Bar scale is from 0-2,5
Psi scale is from 0-36

Idle:
Bar: 0.7-1
Psi: 10-14

After flush:
Bar 0.7
Psi 10

Brewing:
Bar: 0.8-1
Psi: 12-14



Yes basket is dry.

I saw that nicely made video here about making a shot (dont remember what it was called)
where he said to dry the basket because otherwise the coffee starts something
before you pull the shot and it sounded smart so ever since then I have been
wiping it.

Sometimes I flush over the handle and basket and then pop the basket
(leave the handle in the group) dry it, and then dose in the basket.
This is so I can use the scale everytime until I know what the
fudge is going on here :mrgreen:

Sometimes I dose into another basket and pour it over, but its always dry.
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Postby GriffDeLaGriff on Mon Feb 15, 2010 5:40 am

And also the puck after 17g only had 1 hole in it.
I used to have like 10 holes :shock:
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Postby GriffDeLaGriff on Mon Feb 15, 2010 6:11 am

Ok. If there is a way to alter the pressure Im willing to give it a go.
Isnt there a screw or something so I can turn it just a little :mrgreen:
If someone could point me in the right direction as how to do it
It would be nice.

I ground coarser 1 click and got more towards normal timing
like 50s for a 17g 1.25oz before cone destabilized but its spraying more.

So I upped to dose to 18g and 1 click finer and it doesnt help.
I tried to flush and then directly lock and go.
It looks AMAZINGLY beautiful tho. Really nice tigerstriping
and very golden and dark for the entire shot. 1.25oz in 50-something seconds.
Cone is holding alot better but its still spraying alot.
Its better then before, but its still too much.
Not much grains like before but something is off.
I dont really like the idea of me having to make a triple just to get it working.


I can also see that something happens after a while, first its calm
and nice and then *poff* it starts to spray along with that sound.
Is it upping the pressure and thats what destroys it? Looks so.
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Postby sdavidp on Mon Feb 15, 2010 8:22 am

GriffDeLaGriff wrote:Sometimes I flush over the handle and basket and then pop the basket
(leave the handle in the group) dry it, and then dose in the basket.
This is so I can use the scale everytime until I know what the
fudge is going on here :mrgreen:


Do you do this most of the time? Have you tried what gyro suggested, dosing directly into the portafilter? If you really want to weigh, then dose into a small bowl that you can use to weigh the grounds then put them into the basket/portafilter.
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