I'm not sure yet. I can't say there's a noticeable improvement honestly. I see about 9.5 bar when pulling a shot (with the blind PF at 10). So far, it seems like the shots blond out sooner, and that I don't get as thick a head/build up coming out of the PF. I've been planning to dial it back up a bit and compare again, but am on vacation and haven't tried that yet.
On Sat, Feb 7, 2009 at 9:32 AM, Josh Heisler <[email protected]> wrote: > > 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] > > > > -- Chris Bailey [email protected] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Brewtus" group. 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