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Splatter shots
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Discussions > Espresso > Q and A > Splatter shots  
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elemenoh
Senior Member


Joined: 3 Jun 2014
Posts: 1
Location: Bay Area
Expertise: I love coffee

Espresso: Nuova Simonelli Oscar
Grinder: Rocky
Posted Tue Jun 3, 2014, 8:31pm
Subject: Splatter shots
 

I recently got a naked portafilter and all of my shots have been splattering.

Setup
Nuova Simonelli Oscar
Rocky grinder
Naked portafilter (58mm) with double basket
58mm flat tamper
Beans less than 2 weeks old
Grind below '10' adjusted each batch
Scale (only measures to the gram)

Process
Machine is on a timer and has usually been on for 30 min before I use it
Purge some water to avoid steam shock
Purge the grinder a bit to get rid of stale stuff in the chute
Dose 17-18 grams (i've tried more and less to avoid splattering, but it hasn't helped)
I level off with my finger, leaving a bit of a concave shape from the middle
Tamp straight down with about 30lbs force (I've tried more and less, but it hasn't helped)

I can get the shot to pour slower/faster depending on my config, but it always splatters.
I've found there is always coffee on the screen, even though the coffee is below the taper line after I tamp.

From what I've read it sounds like the coffee touching the screen might be the cause of the splatter, but I'm not sure how to avoid it touching. Are there different sized screens or gaskets? Anything else to try adjusting?
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JasonBrandtLewis
Senior Member
JasonBrandtLewis
Joined: 9 Dec 2005
Posts: 6,398
Location: Berkeley, CA
Expertise: I live coffee

Espresso: Elektra T1 - La Valentina -...
Grinder: Mahlkönig K30 Vario -...
Vac Pot: Yama 5-cup
Drip: CCD, Chemex
Roaster: No, no, not another...
Posted Wed Jun 4, 2014, 7:57am
Subject: Re: Splatter shots
 

a) your grinder is part of the problem; b) it's your puck.  Have you tried the Weiss technique, or other distribution method?

 
A morning without coffee is sleep . . .
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 3,129
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4 x2, VDD...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Wed Jun 4, 2014, 12:10pm
Subject: Re: Splatter shots
 

elemenoh Said:

I recently got a naked portafilter and all of my shots have been splattering.

Posted June 3, 2014 link

sounds like channeling, but some light spritzs also happen occasionally without channeling.  difficult to know which, unless you 1) post a video or photo depicting the problem, or 2) confirm the "splattering" is coming out in streams



elemenoh Said:

Grind below '10' adjusted each batch

Posted June 3, 2014 link

need to adjust for each shot, not each batch

elemenoh Said:

Scale (only measures to the gram)

Posted June 3, 2014 link

you "need" a better scale, that measures in 0.1 g increments.  Of course, if you can dose consistently without a scale, then you could get by without one.

elemenoh Said:

Process
...Dose 17-18 grams (i've tried more and less to avoid splattering, but it hasn't helped)...I've found there is always coffee on the screen, even though the coffee is below the taper line after I tamp...From what I've read it sounds like the coffee touching the screen might be the cause of the splatter, but I'm not sure how to avoid it touching. Are there different sized screens or gaskets? Anything else to try adjusting?

Posted June 3, 2014 link

dose needs to be adjusted for machine and basket.  try the nickel test

coffee on the screen can be normal...at ~135psi water pressure (8 bar), there's going to be some movement in the puck.

go to www.espressomyespresso.com Look for article 12 under how to Easy Guide to Better Espresso at Home

 
.
Always remember the most important thing is what ends up in your cup!
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,031
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sun Jun 8, 2014, 11:59am
Subject: Re: Splatter shots
 

+1 to everything said.  Grinder and weight.  Fix those two things and you will only have the rare spritz.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

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Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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