Last edited by Javaphile; 12th September 2015 at 04:22 PM. Reason: Remove unneeded/bad code
Gauge is with me in Sydney now. Anyone else want it next?
Turned out my Silvia has an adjustable OPV so no washer needed. Much force was needed to crack open the locking nut but once loosened I was able to drop pressure down to 9 bar on the gauge. I did find the needle valve in the pressure gauge setup a little tricky to calibrate & get the flow rate to repeatably drip at 1mL/sec. I was also surprised that pressure didn't seem to change dramatically with the flow rate too low (~0.5mL/sec) or too high (~1.5mL/sec) while I was trying to dial in the flow rate.
Just paid my dues to Greg's account so add me to the list. I did this last year but have moved my Silvia to a new homeand cleaned her and can't pull a good coffee since. I've tried everything but a check of the pressure will confirm all is OK. It's such an easy test that it's orth the money. Cheers...
Rechecked my pressure and had to tweak the bleed and then make a fine adjustment to my valve. All fine again now. I can recommend this setup for testing your pour pressures. Gauge is back with Greg now if you want to partake of this great service. Cheers...
Just paid Greg for the hire of the Portafilter.
Just sent the money through for the gauge hire.
Does anyone want the gauge or shall I send it back to Greg?
Gauge is coming back to me now, feel free to post in the thread when you want it next.
Paid, please add me to the list. I'm trying the 6 bar approach promoted by Matt Perger. I want to see whether the pressure set at the rotary pump corresponds to the pressure at the portafilter. I have a Vibiemme Replica single group. Many thanks.
Paid - please add me to the list. I want to check whether my Breville Oracle pump is working as it should (I suspect it is not putting out enough pressure)
I'm testing the pressure on a Vibiemme Replica. I also have a Breville BES920, so I'll check whether the portafilter pressure gauge fits this machine
Good point - might have to buy a second group handle (I was considering having two anyway, as we use it in an office).
Hi John I'm ready to send the pressure gauge. However, you'll need a portafilter that uses the standard 3/8" BSP thread. I don't believe you can get one for the BES920.
So do you want me to ship the pressure gauge to you?
According to this WLL vid on youtube, the gauge should read 10bar to get 9bar at the grouphead as the excess 1 bar will be diverted to the reservoir? happy to be corrected if I misunderstood. getting a porta filter gauge myself to adjust the pressure on my BFC junior.
Pressure can't be diverted elsewhere (but flow can).
9 bar at the group is a guide only - the pressure will vary during an espresso pour, as the resistance and flowrate change.
Greg Pullman's portafilter attemps to replicate flowing conditions, so that there is some pressure drop in between the OPV and the group.
It is a better approximation of real conditions than a blind, but you are effectively calibrating the OPV/pump gauge for a single flowrate.
But, isn't that the intention?but you are effectively calibrating the OPV/pump gauge for a single flowrate.
Identify a median flowrate and then adjust the OPV/Pump Bypass Valve to achieve this at the Group?
All I'm saying is that it won't maintain 9 barg at all flowrates - so there isn't really _an_ ideal brew pressure.
Does that mean that everything revolves around how well the coffee puck in the filter basket is prepared that will determine the actual brew pressure and flow rate?
Yep, it sure does...
And with machines that lack an OPV or a Spring Lever machine, etc it's even more important...
I remember the advice given to me by the guy I bought my naked portafilter for my Gaggia Classic from. "If you do not like how the shot you pulled turns out, just do it again. Don't change the dose or the grind setting. There is a high chance it is just your fault." Best advice I got when I was a newbie to the world of home made espresso.
Is this still doing the rounds?
Yep as long as someone needs it it's still available. Just follow the instructions in the first post and I'll send it out to you.
Paid up, please add me to the queue.
Thanks Janus... if anyone else wants to use the gauge please check the instructions at the start of the thread. Janus should have it around the end of this week so I'd imagine it'll be available mid-September-ish.
Whoops figured it out.
Last edited by Janus; 5th September 2017 at 09:38 PM.
Thinking about joining the queue. I know MB21 was also considering it.
Righto, I've paid up... add me to the queue. I've sent a message to Janus.
As matt said I'm keen just not ready yet
I've sent payment tonight so when Matt is finished (no hurry) i'll get the gauge when Matt is finished.
Please add me on the list, all paid up.
All done with this now. If there is nobody on the list I'll send it back to Greg after the weekend.
Hi Greg. I have just paid you by internet banking $20.
For anyone else who does not find it obvious, yes you have to remove the underscores as well.
All the best,
OK I am ready to post on or back to Greg.
The female brass fitting that screws onto the group handle had split along a manufacturing seam and leaked badly so I had to source one. The new one has a bit thicker wall so I doubt it will happen again. The threads on the old fitting were pretty worn so not a bad thing that it is replaced. I have put in a new rubber washer that was missing but the new fitting is a little deeper than the old one. This means that the short length of threading on most group handles will probably not compress the washer and you will still have to rely on the plumber's tape to seal the threads. I have put in a new roll of tape.
Thanks Greg for providing the service.
Glad I stumbled upon this thread before I started building my own!
I'm paid up - please add me to the queue, and thanks for sharing!
All done with this now. If there is nobody on the list by the end of the week, I'll send it back to Greg.
Hey guys! I just completed payment, please add me to the queue!
Just wondering if this is still on the road and who has it...?
Just paid up. Keen to see what the pressureís like on my machine.
Thanks for lending out your gauge Greg. It is very helpful to know what the pressure like at the group head. Iíll send it back to Greg next week if no one else is in line.
I have made payment. Please add me to the queue