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Shower screen and basket options for Delonghi Dedica?


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Hi all,

 

I'm wondering if anyone has found an upgraded/precision shower screen and non-pressurized basket that will fit the Delonghi Dedica 685. I've ordered a bottomless portafilter which comes with a non-pressurized basket, but I'm wondering if I can upgrade further by getting a precision 51mm basket and/or any upgrades to the shower screen. With regards to the basket, I'm assuming that as long as it's 51mm in diameter it should fit the bottomless pf? Or is there more to consider?

Many thanks.

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The lip / flange of the basket needs to be considered. Some are flat some are curled over.

I bought a La Pavoni 51mm basket for a DeLonghi Icona and had to hammer the flange flat in order to make it fit. Worked OK though, but I wouldn't describe it as precision. Not sure if the Icona has the same PF style as your machine.

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GS3 MP, Ceado E92 and E37s, Feldgrind. Niche.

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13 hours ago, lake_m said:

The lip / flange of the basket needs to be considered. Some are flat some are curled over.

I bought a La Pavoni 51mm basket for a DeLonghi Icona and had to hammer the flange flat in order to make it fit. Worked OK though, but I wouldn't describe it as precision. Not sure if the Icona has the same PF style as your machine.

Thanks, I'll have a look around and see if any match. Did you run in to any problems having hammered the flange flat on your La Pavoni? Did everything fit snug?

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9 hours ago, Espressonic said:

Thanks, I'll have a look around and see if any match. Did you run in to any problems having hammered the flange flat on your La Pavoni? Did everything fit snug?

Yes, it sealed just fine. Started off bending the lip out with pliers all the way around then gently hammered it out flat and smooth. 

GS3 MP, Ceado E92 and E37s, Feldgrind. Niche.

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Might be easier with one of these, although again, not ‘precision’.

https://www.amazon.co.uk/MagiDeal-Coffee-Pressurized-Breville-Delonghi/dp/B01JRH3DMS

 

 

GS3 MP, Ceado E92 and E37s, Feldgrind. Niche.

_____________________________________________________________________________________________________________________________________________________

 

 

 

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On 02/01/2021 at 00:41, HDAV said:

Can you adjust the pressure of the machine from the factory 15bar?

I'm not sure but I don't think so. Perhaps by opening the machine up and changing the pump? Not something I've heard about being modded though

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31 minutes ago, Espressonic said:

I'm not sure but I don't think so. Perhaps by opening the machine up and changing the pump? Not something I've heard about being modded though

Then you are likely wasting money on trying to improve extraction by buying more expensive baskets and screens 

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Because at 15bar the extraction will be too fast by all means try it but baskets and screens are fine tuning to slow a bit pressure extraction down you will have to grind very fine and tamp hard with a classic for example the first thing to do is lower the pressure from 15 to 9 bar (what commercial machines run)  or lower

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2 hours ago, HDAV said:

Because at 15bar the extraction will be too fast by all means try it but baskets and screens are fine tuning to slow a bit pressure extraction down you will have to grind very fine and tamp hard with a classic for example the first thing to do is lower the pressure from 15 to 9 bar (what commercial machines run)  or lower

Surely 15 bar is the maximum the pump can produce when the system has 0 flow? So wouldn't the "real" pressure at the group head be determined by the grind/tamp? 

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Depends how much flow there is. Without an OPV to limit the pressure, you'd probably have to go coarser than is good for the extraction in order to keep the pressure down. Put a fine grind in there that's suitable to properly extract and the pressure will shoot past 9 bar pretty quickly.

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20 hours ago, allikat said:

Depends how much flow there is. Without an OPV to limit the pressure, you'd probably have to go coarser than is good for the extraction in order to keep the pressure down. Put a fine grind in there that's suitable to properly extract and the pressure will shoot past 9 bar pretty quickly.

I wonder how easy it would be to fit an OPV with the correct rating. Could be something I'll look into as well. From reading, I can't quite work out if it has one fitted already. I found one post where someone said they replaced the OPV with a saeco valve, but other places it sounds like it doesn't have one at all.

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Look up parts diagram or open the machine up and have a look if it’s a boiler rather than themroblock it likely does have a pump mounted opv may be integral to the pump but you could fit a second opv at lower pressure 

 

https://coffeemachineparts.uk.com/index.php/coffee-machine-parts/delonghi-spare-parts/delonghi-ec-685-spare-parts

 

part 39 looks like opv to me but here is also a flow meter and adjusting opv may upset the flow meter 

Edited by HDAV
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22 hours ago, Espressonic said:

Surely 15 bar is the maximum the pump can produce when the system has 0 flow? So wouldn't the "real" pressure at the group head be determined by the grind/tamp? 

There is a formula to work it out based on the flow, most machines use max set pressure (excess is dumped via opv back to tank while brewing)  to flow water through the puck you adjust grind and tamp to achieve the brew time and output typically 1:2 by mass in 30 seconds with a fixed pressure with 50% more pressure you going to be running faster so won’t get the extraction the pressurised basket is designed to work with the higher pressure and force crema from stale supermarket pre ground coffee. 

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On 10/01/2021 at 10:29, HDAV said:

Look up parts diagram or open the machine up and have a look if it’s a boiler rather than themroblock it likely does have a pump mounted opv may be integral to the pump but you could fit a second opv at lower pressure 

 

https://coffeemachineparts.uk.com/index.php/coffee-machine-parts/delonghi-spare-parts/delonghi-ec-685-spare-parts

 

part 39 looks like opv to me but here is also a flow meter and adjusting opv may upset the flow meter 

Do flow meters generally work on volume? I know you can adjust the quantity for a shot on the Delonghi Dedica so if I changed the opv would it just be a case of adjusting the quantity to compensate?

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I don’t have intimate knowledge of the machines operation, however I see a potential issue, with machines like a classic you control the pump and can pump for as long as you wish 10seconds, 30sec, 300 sec..... if you lower pressure more water flows through opv so dose would be short possibly too short to drink now depends how much adjustment and manual control you have of the flow if you can ignore the preset does button and runs the pump manually great if not I can see a lot of wasted or undrinkable shots. 
 

this is the issue when your trying to manualise a process that has been automated for consumers  delonghi expect you to put some so so pre ground in and be happy with what falls out I worked with a guy who had a delonghi machine only ever drank illy preground straight with sugar I was going to buy the same machine back then until I fell into this rabbit hole,and ended up with a classic 

Edited by HDAV
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On 02/01/2021 at 00:41, HDAV said:

Can you adjust the pressure of the machine from the factory 15bar?

Depends how far you are willing to go.

https://www.youtube.com/watch?v=rT6k6exSXKU

It's in Arabic, but it's self explanatory. You add your manometer with a controlled valve into the water path before the basket, Then you take the excess pressure from the basket through this valve.



 

Edited by Curious
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Anything is possible if you throw enough time and money at it.............. I would make that my signature... but that costs £15 🤭

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Here is a less brutal and free way of doing the same. Is this guy a genius or what? I don't understand 99% of what he is saying, I guess he explains the theory behind his "invention" for the first 8 minutes. But it becomes pretty simple when you see his way in action at 8:32. 

https://www.youtube.com/watch?v=ZXXDzD9bxA8&t=512

I might try this one day. :)


 

Edited by Curious
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You have two issues here. First the pressure hitting the puck is an issue, but you also have to maintain the flow through the thermoblock to get anything close to the right brew temperatures. So you'd really have to put the OPV after the thermoblock so that doesn't either overheat the water or shut off and cool down either... which means throwing hot water into your drip tray or back into the reservoir. 

Personally, I gave up on trying to mod the Dedica and moved on to Gaggia rebuilding as the machine is far better designed for a real espresso shot. Don't get me wrong, the Dedica is a lovely machine for what it is, but it is inherently limited in what it can be. I love mine and keep it around for emergencies... it's a neat little machine and can do wonders with terrible coffee.

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2 hours ago, allikat said:

You have two issues here. First the pressure hitting the puck is an issue, but you also have to maintain the flow through the thermoblock to get anything close to the right brew temperatures.... 

Can be mitigated by controlling how much coffee is in the basket and how fine you grind. Just put less coffee to make sure you get proper extraction with less flow.  
 

2 hours ago, HDAV said:

well leaving steam valve open will redu🤪ce the pressure ..... how much tho 

Depends :). Fully open reduces it by 100%, fully closed - by 0%.

I guess his fiddling with the steam valve before the actual shot was in order to achieve roughly 60%-40% split between the basket and the wand. 60% of 15 bar = exactly 9 bar. Anyway, 9 bar is not written in stone. One can still make a good espresso with anything between 5 to 8 bars, as long as it is more or less consistent. 

Anyway, I am not saying that this way gives better results than Olympia Cremina, just answering the original question if the pressure can be reduced below 15 bar.

 

Edited by Curious
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