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] --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
