Iluvdabean Senior Member Joined: 7 Mar 2005 Posts: 1,271 Location: Kentucky Expertise: I love coffee
Espresso: La Nuova Era Cuadra/Gaggia... Grinder: Baratza Preciso/K-A Pro... Drip: Bonavita BV 1800 TH Roaster: Nesco 1010/Behmor 1600
Posted Sun Mar 24, 2013, 8:06am Subject: Re: Breville dual boiler pressure too low
Well so it sounds like scratch my PP idea. Dan you make me laugh with your comments,you have a good sense of humor.
I bought a BDB and had the same problem. I messed around with grind, tamp pressure, dose and God knows for about a month. My pressure maxed at about 7.5 bars, and grinding finer on my Vario eventually just choked the machine. My shots were all sour tasting too. Always.
Breville offered to exchange the machine. I suspect that this was one of the earlier machines that was shipped with a too tight OPV, and then recalibrated, but they overdid it on the down side.
I sucked it up and adjusted the OPV myself, using the advice in the youtube video. Being a klutz, it took me longer than 15 mins. DO NOT drop the nylon locking sleeve into the guts. Particularly do not drop it in a second time or your expletives will blister paint, necessitating repaint kitchen walls and therapy for any kids nearby.
Anyway, I got it adjusted. Now sweet 9 bars, 199 degrees, 4 second preinfusion, heavy tamp, coarser grind, 18.8 g dose, resulting in a 26-27 second 45ml shot of absolute loveliness. My heart sings with delight when tasting the chocolatey aromatic goodness, and then palpitates when I cannot resist the second shot.
Oh and BTW, I think letting the machine warm with PF in place for 20 -30 mins is a good idea. I still run a little hot water through the empty PF before fillling. I think it makes a diff.
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