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lee1980

Naked Portafilter splutter

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I have been using naked portafilter with my Rocket R58 for sometime now, I think it is a 21g basket it came with. Works well generally, my question relates to how can stop it from spluttering/spraying. I guess its when it takes a long time to form one continuous stream you get little smaller streams off that make a mess.

Is there a simple reason why this happens?


Thanks

 

Lee. (R58 and Zenith 65e)

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Right grinder settings, right distribution and amount of coffee, proper tamping and it should be fine.

The bad think about naked holders is that if only one of these is not correct, you get messy shot more or less.

Edited by L&R

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What is your shot preparation and what is your recipe?

 

By shot preparation I mean do you do anything apart from grinding and tamping?

 

Recipe wise, how many grams of coffee are you using, what is the output weight and time?

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I thought that be the case one thing out and its messy.

Set to 7.5 secs, between 1-2 on grind setting and tend to adjust as see grind vary depending on age of bean.

 

I think ultimately its down to not enough in basket and not fine enough, will go back to weighing it to.

Is a 21g basket to.


Thanks

 

Lee. (R58 and Zenith 65e)

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Purge, Prep, distribution, prep, distribution, prep, level and tamp.
This.

 

As Soon as I paid more attention to prep and distribution I get zero spurty naked PF shots.


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Purge, Prep, distribution, prep, distribution, prep, level and tamp.

 

I'm so glad you said that. I thought I was being too picky/slow/over-whatever with my prep & distribution stage.


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Umm what do i purge? ok with rest of it but need to be more consistent and better distribution.


Thanks

 

Lee. (R58 and Zenith 65e)

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I use an 18g VST on my R58 with a Londinium distribution tool and an OCD tool and I get absolutely no issues. 99% of extractions look fantastic. If you get your routine right it really isn’t hard.


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I have a 21g basket I use with my naked portafilter from time to time. While it doesn't happen often, I have found the odd bean needing more coffee (sometimes as much as 24g) to get a decent fill height.


Laissez les bons temps rouler

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I have been using naked portafilter with my Rocket R58 for sometime now, I think it is a 21g basket it came with. Works well generally, my question relates to how can stop it from spluttering/spraying. I guess its when it takes a long time to form one continuous stream you get little smaller streams off that make a mess.

Is there a simple reason why this happens?

 

End to end Vid with your shot prep and the pour would be handy to see,...especially for diagnostics/advice.


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Will try on weekend, though lighting is terrible to see clearly. I tried finer and got 20g weight in there but it feels like far to much and then takes for ever to push through. At around 18g in 21g basket seemed better and 3rd one I did it went to a nice stream real quickly. I gave up weighing in the past and just did it by eye as found the beans varied (Italian job from Rave) getting same blend each time but i guess depending on how long left they vary then in grind.

I would keep number of seconds on grinder the same but adjust grind until i get a nice mountain that doesn't over spill to much.


Thanks

 

Lee. (R58 and Zenith 65e)

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Purge, Prep, distribution, prep, distribution, prep, level and tamp.

 

Out of curiosity, you see many times that people don't do as much "prep, distribution" (sometimes none), why do their shots come out fine?


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If you look at a naked PF extraction, it will squirt coffee at you or you’ll have the walls of your house painted.

 

You’ll see black spots and you’ll see what only parts of the holes are actually letting water through.

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I'm not following how that answers my question?


Home 1 -- Melitta Varianza CSP

Home 2 -- Lido 3 & 2012 Gaggia Classic (modded)

Outside -- Porlex mini (modded) & Aeropress

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I'm not following how that answers my question?

 

Sorry. I now understood you question. What do you mean by no prep?

 

Bear in mind they high end grinders do the distribution for you.

 

For example, if with my grinder, I don’t stir the grinds in the basket, I get a bad extraction. With a high end grinder, you do not need to do this.

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Sorry. I now understood you question. What do you mean by no prep?

 

Bear in mind they high end grinders do the distribution for you.

 

For example, if with my grinder, I don’t stir the grinds in the basket, I get a bad extraction. With a high end grinder, you do not need to do this.

 

I’m stirring . . .


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By no prep I mean I don't see them fluffing up the coffee in the basket. But yeh, a good grinder answers that question I suppose. Thanks.


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Home 2 -- Lido 3 & 2012 Gaggia Classic (modded)

Outside -- Porlex mini (modded) & Aeropress

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I’m stirring . . .

 

Yes... but that’s on the monolith right? I meant to say high end hopper fed commercial grinders.

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Out of curiosity, you see many times that people don't do as much "prep, distribution" (sometimes none), why do their shots come out fine?

 

It's because it depends on a number of factors.

 

1. The type (varietal) and roast level of coffee (because they all have to be ground differently (finer/coarser) and some coffees absorb water better/faster than others

2. The type of basket (not single or double) I mean the type of double etc..and diameter of basket.

3. The application of brew pressure

4. The temperature

5. Distribution

6. Tamping

 

It would be fair to say that distribution and tamping are not major factors, but a small part of the whole. I often don't bother distributing, but the shots still come out fine. Perversely, your more likely to have an easier job on a vibe pump machine as opposed to a rotary pumped machine, due to the slow pressure ramp. So there is not a single answer to the question, but broadly speaking you cannot put all the success criteria down to distribution.

 

P.S. All my early Niche shots had no stirring, but I didn't really get problems.

Edited by DavecUK

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It's because it depends on a number of factors.

 

1. The type (varietal) and roast level of coffee (because they all have to be ground differently (finer/coarser) and some coffees absorb water better/faster than others

2. The type of basket (not single or double) I mean the type of double etc..and diameter of basket.

3. The application of brew pressure

4. The temperature

5. Distribution

6. Tamping

 

It would be fair to say that distribution and tamping are not major factors, but a small part of the whole. I often don't bother distributing, but the shots still come out fine. Reversely, your more likely to have an easier job on a vibe pump machine as opposed to a rotary pumped machine, due to the slow pressure ramp. So there is not a single answer to the question, but broadly speaking you cannot put all the success criteria down to distribution.

 

P.S. All my early Niche shots had no stirring, but I didn't really get problems.

 

Hehe, ok I did not realise that any of those points 1-4 affected the smooth flow at the end. Thank you Dave, again :)


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Home 2 -- Lido 3 & 2012 Gaggia Classic (modded)

Outside -- Porlex mini (modded) & Aeropress

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I thought that be the case one thing out and its messy.

Set to 7.5 secs, between 1-2 on grind setting and tend to adjust as see grind vary depending on age of bean.

 

I think ultimately its down to not enough in basket and not fine enough, will go back to weighing it to.

Is a 21g basket to.

As a fellow 65e owner, I'm surprised that you get anywhere enough ground coffee in that time and at that setting (acknowledging that machines will vary and also depends on bean). Mine is set to about 11.5secs on 2.5 grind setting (Rave Chatwood blend) and I'm getting approx 19g into an 18g VST. Are you sure you're putting enough coffee in the basket ? Have you weighed like everyone else has said ?


Rocket Giotto Evo 2, Zenith 65e

 

I know what the problem is now.... it's me !

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Thanks after some trying on weekend I think maybe going to fine a grind to, forgot to do any vids and keep forgetting to weigh before I start!!! Need some better scale to mine seem to vary depending on where porta filter i placed. Need flatter bigger scale.

Another thing I noticed is the stream of coffee sometimes pulses, and like stops and starts, maybe this is the pump as its to fine and working to hard, should be continuous flow i guess.


Thanks

 

Lee. (R58 and Zenith 65e)

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Still getting random spurts from naked basket, sometimes its like many spurts that sort of shower inside of walls of glass, other times its on tiny pin size stream shooting out the top of cup and going everywhere.

Is there one typical cause for this?, been trying to be more consistent will all weighing and tamp pressure etc.  Just seems random, one time it will build to one nice thick flow stream no spurts clean glass etc, other times just the 1 tiny spurt!!


Thanks

 

Lee. (R58 and Zenith 65e)

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Do you stir your grounds with a whisk at all?


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