Chris, Now that you have dialed it down to 10 bar with the blind PF would you say the shots have improved? If so how so?
Josh On Jan 30, 1:00 pm, Chris Bailey <[email protected]> wrote: > I don't believe I got a PF pressure gauge with my machine, but maybe I'll > check in on that. I have mine now set to 10 bar with the blind PF, and it > seems to indicate about 9.5 bar when pulling shots. Having another gauge, > as long as it's relatively accurate, would be another data point. Does > anyone sell a complete pressure gauge solution that works for the BII? I've > seen people building them, but haven't found one I can just buy. I can > build one, but, um, am not really motivated to do so if I can find one to > purchase. > > > > On Thu, Jan 29, 2009 at 8:53 AM, <[email protected]> wrote: > > I might add that when I did my investigation of the pressure gauge > > mounted on my Brewtus II, I found that the portafilter pressure gauge which > > was sent to me by WLL when I first bought the machine was accurate when > > compared to my expensive test gauge. It was the pressure gauge mounted on > > the machine that was 2 bar too high. > > > Allen > > > *From:* Chris Bailey <[email protected]> > > *Sent:* Thursday, January 29, 2009 7:33 AM > > *To:* [email protected] > > *Subject:* Re: Adjusting pressure > > > Ok, thanks Todd, good to know. I will dial it down a bit. Yes, 11.5 bar > > when with blind, and more like 10 I think when brewing, which is consistent > > with what you mentioned. I'll try it out with my next shot and see how it > > goes. > > > On Thu, Jan 29, 2009 at 8:25 AM, Todd Salzman > > <[email protected]>wrote: > > >> Hi guys, I don't think I said that the gauge does not read correctly. I > >> was just trying to say that with a blind filter basket we set them at 10 > >> bar. This means that when you brew with a proper grind and coffee at > >> about 2oz in 25 seconds the brew pressure should read around 8.5 on the > >> gauge. This means the other 1 to 1.5 bar of pressure is being diverted > >> to the reservoir from the OPV, so that the gauge is actually reading the > >> brew pressure accuratly. > > >> When we do our set up on the machine we actually don't use a blind basket, > >> we use a portafilter with a gauge and the pressures are always very close. > > >> If you are at 11.5 with a blind portafilter you are to high put the blind > >> basket in and dial it back to 10 bar. This is a good starting point. > > >> Todd > > >> Whole Latte Love > > >> This was one of my worries, was that the pressure gauge wasn't accurate, > >> and then as per Todd's note that what the gauge reads isn't necessarily > >> what > >> the actual pressure is. That is pretty poor in my opinion - why bother > >> putting a gauge on there if it's going to be wrong. But, alas, that's what > >> we have. This is one reason I'm nervous to monkey with it, as it's hard to > >> say whether it's really wrong or not, it just surprised me that mine > >> consistently reads 11 bar (with blind PF or when pulling shots). I'll > >> verify that in a few minutes, but pretty sure. > >> I'm grinding, tamping, etc. as per standards AFAIK: 30lb tamp, grounds > >> typically around 15g in the double basket, grind setting such that my shots > >> are typically in the 25-30 second range from the time I pull the lever to > >> when I've filled a cup approx 1.5oz by volume (I mostly pull shots by where > >> it fills to on my cups, but have measured this and it's right about 1.5oz). > >> I've read a fair bit, practiced a ton, use only fresh beans (3 to maybe at > >> most 9 days after roast date), grind on a nice Macap grinder, etc. I've > >> had > >> a friend who's pulled a ton of shots use my machine as well. > > >> On Wed, Jan 28, 2009 at 7:05 PM, <[email protected]> wrote: > > >>> Also be aware that the pressure gauge on the Brewtus II can be wrong. I > >>> went to considerable effort and expense to more or less establish (to the > >>> degree that the large pressure gauge that I bought is accurate. It was > >>> sold > >>> with the statement that it has an accuracy of 1%) that the pressure gauge > >>> on > >>> my machine is two bar off. I wrote about this at the time on this group, > >>> so > >>> you might be able to find it with a search. > > >>> Allen > > >>> *From:* Chris Bailey > >>> *Sent:* Wednesday, January 28, 2009 4:56 PM > >>> *To:* [email protected] > >>> *Subject:* Re: Adjusting pressure > > >>> My screw looks like it's metal, and is located on the front of the > >>> machine, lower right corner, once you've removed the drip tray. Sound > >>> right? I do tamp to 30lbs. I'll use the blind PF to set the pressure, > >>> thanks for that info! > > >>> On Wed, Jan 28, 2009 at 5:46 PM, BinBakinBeans < > >>> [email protected]> wrote: > > >>>> Which version of Brewtus? > >>>> The first had a teflon screw on the opv valve that became problematic > >>>> after adjusting the pressure. > >>>> The first of the BII had teflon as well. They were later switched to > >>>> an opv with a brass adjusting screw. I replaced mine with one of these > >>>> after I had problems with my original teflon screw opv on my BII. > >>>> Strangely enough, Expobar has again gone back to using an opv with a > >>>> teflon screw on the new BIII machines. > >>>> I would say go ahead and adjust it, especially if it is a brass > >>>> screw. If it is teflon, be prepared to "possibly" have some future > >>>> problems with it. Not a big deal to change it out if you do. > >>>> Use the blind filter in the portafilter to get it down to about 8.5 to > >>>> 9 on the guage. > >>>> Check again when you actually pull a shot that it is around 8.5. I > >>>> will assume that you will have properly tamped to about 30 pounds. > > >>>> On Jan 25, 12:27 pm, Chris Bailey <[email protected]> wrote: > >>>> > I've seen a fair bit of talk on the list about adjusting pressure. > >>>> Given > >>>> > the fact that there's tape over the pressure adjust screw on my > >>>> machine, and > >>>> > all the warnings about don't touch it, only let the factory do it, > >>>> etc, > >>>> > etc., I'm leery of messing with it. Also, my understanding is that > >>>> > supposedly the factory has pulled shots and checked the pressure and > >>>> set it > >>>> > properly. > >>>> > But, I've just wondered about it. My pressure gauge typically reads > >>>> about > >>>> > 11 bar when I'm pulling shots. I'm unclear on whether it's supposed > >>>> to read > >>>> > the true 8.5-9 bar that an espresso should be done at, or whether the > >>>> gauge > >>>> > is a pressure at a different point in the system and thus the real > >>>> pressure > >>>> > at the PF is lower, or not. > > >>>> > Can folks discuss this a bit? Other than taste, are there ways for me > >>>> to > >>>> > know whether my machine is set right or not, and/or if I'm going to > >>>> adjust > >>>> > it (and potentially void my warranty?) how can I know when I've set it > >>>> to > >>>> > the right spot? From the reading I've done I think I understand that > >>>> too > >>>> > much pressure can actually cause a build up and not get things flowing > >>>> > properly (which seems a bit backwards, but I sort of understand). > > >>>> > Anyway, let me know what folks think. > > >>>> > -- > >>>> > Chris Bailey > >>>> > [email protected] > > >>> -- > >>> Chris Bailey > >>> [email protected] > > >> -- > >> Chris Bailey > >> [email protected] > > > -- > > Chris Bailey > > [email protected] > > -- > Chris Bailey > [email protected] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Brewtus" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/brewtus?hl=en -~----------~----~----~----~------~----~------~--~---
