Flow-profiling mod on KvdW Speedster - Page 2

Need help with equipment usage or want to share your latest discovery?
User avatar
Peppersass
Posts: 3690
Joined: 15 years ago

#11: Post by Peppersass »

Slayer has a gicleur in their system. I believe the advantage is that you can quickly switch back-and-forth between pulling shots at the standard flow rate and extended pre-infusion using the needle valve simply by disabling or enabling Pre-Brew (i.e., deactivating or activating the solenoid valve.)

I think readjusting the needle valve to switch between the modes would make it hard to reproduce the desired flow rates consistently.

Perhaps a less important reason is that with the Slayer you can switch between Pre-Brew and standard flow during a shot. This allows you to pre-infuse at a slow rate and then ramp to full pressure at the standard rate. From what I understand, however, careful adjustment of the needle valve can get you slow preinfusion with a smooth ramp to max pressure without switching to full flow.

Personally, I'd put the gicleur back in.

User avatar
indend007 (original poster)
Posts: 232
Joined: 13 years ago

#12: Post by indend007 (original poster) replying to Peppersass »

Hi Peppersass.
I'm now using 0.7mm gicleur on my speedster. ^^
And It is same as slayer's.

User avatar
Peppersass
Posts: 3690
Joined: 15 years ago

#13: Post by Peppersass replying to indend007 »

Ah. I thought you had removed the gicleur altogether. My bad.

User avatar
JohnB.
Supporter ♡
Posts: 6579
Joined: 16 years ago

#14: Post by JohnB. »

indend007 wrote:John. I have no plan to swap my gicleur to 0.6mm again.

It's very easy to simulate extraction like your speedster in needle valve system. I will set the flow to about 600ml/min with needle valve and it will show same extraction ability as 0.6mm gicleur. Any matter?
The pre infusion that Kees designed into the Speedster result's from a combination of the remote .6mm jet located between the boiler & HX and the PPI cylinder. The initial zero pressure wetting of the puck & slow build to line or pump pressure is a result of the slow build up of pressure between the puck & the .6mm jet located inside the machine. If you want to compare your modded set up to the Speedster's pre infusion that Kees designed in then use the stock set up not a "simulation" using your needle valve & a .7mm jet.
LMWDP 267

User avatar
indend007 (original poster)
Posts: 232
Joined: 13 years ago

#15: Post by indend007 (original poster) replying to JohnB. »

John, I think that there is no different in 0.6mm and ristricted needle valve to 0.6mm. Both have same flow-rate and same charge speed into PPIC.

User avatar
JohnB.
Supporter ♡
Posts: 6579
Joined: 16 years ago

#16: Post by JohnB. »

I explained the difference in my post, you are free to do as you chose.
LMWDP 267

User avatar
indend007 (original poster)
Posts: 232
Joined: 13 years ago

#17: Post by indend007 (original poster) »

<missing video>

Nowadays, I tested some extraction profiles with different flow-rate.
By combination needle valve and flow source, I'm able to apply variable flow on my shot.
I made some shot videos, and today post one of them.

There are 5 phases on this video.

#1. Pre-infusion : Ristricted line flow-rate.
#2. Pre-Brew : Line flow-rate.
#3. Extraction : Full Pressure.
#4. Post Extraction : Ristricted Pump flow-rate.
#5. Final Extraction : Ristricted line flow-rate.

User avatar
naked-portafilter
Posts: 698
Joined: 10 years ago

#18: Post by naked-portafilter »

Hi Devin,

Wasting that delicious double shot just for the video! It's a sin :-).

We exchanged on SOURCED (https://vimeo.com/130524288) 3 weeks ago on the bwissue fb side? Is that right? Is that your home page?

Kind regards

Gábor

User avatar
indend007 (original poster)
Posts: 232
Joined: 13 years ago

#19: Post by indend007 (original poster) »

naked-portfilter wrote:Hi Devin,

Wasting that delicious double shot just for the video! It's a sin :-).

We exchanged on SOURCED (https://vimeo.com/130524288) 3 weeks ago on the bwissue fb side? Is that right? Is that your home page?

Kind regards

Gábor
Yeh, We did. :) And it's my website, too.

TheJavaCup77
Posts: 267
Joined: 10 years ago

#20: Post by TheJavaCup77 »

Did you find that flow profiling influence flavor profile?

Would like to know...
It could be as complex or as simple as you want. It's the choice of the barista.