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Brasilia Cappuccino Del-1 Restored: Rebuild Project
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Discussions > Espresso > Espresso Mods > Brasilia...  
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rsinger
Senior Member
rsinger
Joined: 25 Jan 2008
Posts: 188
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Tue Nov 1, 2011, 10:38pm
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Olof:

Happy to help if I can...  good luck!

Best,

Rick

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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kellogs
Senior Member
kellogs
Joined: 28 Jul 2010
Posts: 6
Location: Sweden
Expertise: I live coffee

Posted Fri Nov 4, 2011, 8:45am
Subject: Re: Brasilia Cappuccino Del-1 Project
 

I was wondering if you could measure your brewing temperature and what does your pressure meter show?

Best regards
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rsinger
Senior Member
rsinger
Joined: 25 Jan 2008
Posts: 188
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Fri Nov 4, 2011, 1:46pm
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Hi Olof:

First of all, when it comes to pressure, there are two pressures to be aware of.  The Pump pressure (not shown on the espresso machine pressure gauge) and Boiler pressure, which is shown on the machine pressure gauge, and is our proxy measurement for brew temperature.

In the photo below, is the portafilter pressure gauge that I made for setting the over-pressure valve to adjust the pump pressure.  For this machine I adjusted the pump pressure to 8.5 Bar, but the only way to measure it is with the portafilter gauge.

The boiler pressure, i.e., what we read from the pressure gauge on the face of the the machine, is adjusted by the adjustment screw on the Sarai pressurestat see photo in the next window.  By adjusting the pressure in the boiler, we can control the temperature of the water used for brewing.  The general range of temperatures for espresso are in the range of approximately 192-205 (deg F) or about 89 to 96 (deg C).  On my machine, within the normal temperature range for espresso extraction, which can vary by bean variety, roast quality, and age of the bean, I'm, usually in to range of about  0.96 - 1.25 Bar.  But personally, I don't adjust the boiler pressure (I mean temperature) my measuring it, but rather by the flavor of the extracted shot (bitter - too hot, sour - too cold).
I hope that helps a bit.

Best,

Rick

rsinger: PF_Pressure Gauge2.jpg

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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rsinger
Senior Member
rsinger
Joined: 25 Jan 2008
Posts: 188
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Fri Nov 4, 2011, 1:46pm
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Here's a picture of the Sarai Pressurestat

rsinger: V_289_medium.png

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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kellogs
Senior Member
kellogs
Joined: 28 Jul 2010
Posts: 6
Location: Sweden
Expertise: I live coffee

Posted Sun Nov 6, 2011, 4:00am
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Thanks for your reply. I'm only getting my group head to around 70-75 C (158-167F). This machine has no thermosyphon the heating of the group is by the brass against the boiler (right?).  I don't know what to do to get the temperature higher. Espresso at too low temp isn't really nice :D
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rsinger
Senior Member
rsinger
Joined: 25 Jan 2008
Posts: 188
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Sun Nov 6, 2011, 6:13am
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Olof:

Have you adjusted the screw on the pressurestat??  If you look down from the top at the pressurestat, there is a slotted screw head.  Turning it counterclockwise, will increase the boiler pressure, and therefore the brew temp.  If adjusting the pressurestat has no effect, you may need to replace it... but first, make sure the "plumbing" is clean and not obstructed.

Best,

Rick

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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Spalte5
Senior Member


Joined: 22 Nov 2011
Posts: 19
Location: Copenhagen, Denmark
Expertise: I love coffee

Espresso: Brasilia Cappuccino Del 1
Grinder: Compak k3
Posted Tue Nov 22, 2011, 3:15pm
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Hi Rick,

That is truly an amazing job that you did!

I have an identical machine, which unfortunately has a rupture in the HX. I have thus removed the boiler and will now need to open it. I would therefore like to know how you removed the boiler ends before I damage something:-) ?

Thanks!

Malthe
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rsinger
Senior Member
rsinger
Joined: 25 Jan 2008
Posts: 188
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Tue Nov 22, 2011, 10:30pm
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Hi Malthe:

Thanks!  It was a fun project and the espresso I'm making in combination with the Pharos grinder is consistently great too!

Well........... that's a great question!

First - I would recommend you remove all of the connectors (elbows and T's) on each of the boiler end plates.

Second - you need to remove the two bolts (one on each end of the boiler) that hold the HX tube in place.

Third - get a rubber (or plastic) mallet (yep, that's right a rubber or plastic hammer).

Fourth - get to work!  Use the hammer around the edges (lip) of the end plate, striking it in a direction away from the boiler body, parallel to it's long axis.

Fifth - if it doesn't come off easily, don't worry, it doesn't!  Just get a bigger rubber hammer if necessary!

In all seriousness, that really is the way it's done, check this link, for corroboration.  Just be careful not to distort the body of the boiler (it's pretty resistant to distortion, so this really isn't a problem).  But you'll be surprised, it takes a fair amount of effort to get the end plates off, in order to open the boiler.

Of course, when you re-assemble the boiler, you'll want to get new gaskets (o-rings) for the boiler end plates, and for each end of the HX as well.  Keep in mind, depending on the year and model, some of the boiler end plates have just one large viton o-ring each, whereas others have the viton o-ring, as well as a Teflon seal for each end plate, so take a look at it open before you order any parts for it.


Good luck,

Rick

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 8,034
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Nov 23, 2011, 12:46pm
Subject: Re: Brasilia Cappuccino Del-1 Restored: Rebuild Project
 

Nice job Rick!
I hate that steel screws are used where they are sure to rust. I just did a full tear down and rebuild of a Silvia because one of the screws on the boiler corroded off and she developed a leak. Like yours, SS screws now are doing the holding duty. There is no excuse for steel screws in high potential corrosion use.

I was lucky though, the screw heads broke off high enough, I could use some very fine oil down into the threads and with the use of a vise to hold the screw ends, they came out.

Looks nice! I am sure you will enjoy that machine a whole lot more knowing every little thing about it. Nice job!

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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rsinger
Senior Member
rsinger
Joined: 25 Jan 2008
Posts: 188
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Wed Nov 23, 2011, 5:41pm
Subject: Re: Brasilia Cappuccino Del-1 Project
 

Hi Wayne-

Thanks!  It was a lot of fun, and except for those two rusted screws, pretty straight forward.  Believe it or not, the thing I'm enjoying most about it on a daily basis, is the custom tuned steam tip... It's become effortless to make good quality micro-foam and I'm able to pour latte art with every cup (getting pretty good at it too :).  I also replaced every structural and component support screw with stainless steel screws (and washers) while I was at it.

Since you just rebuilt a Silvia, I thought I'd point you in the direction of a Blog that I wrote describing the Silvia project that I did a while back.  It was incredibly challenging for me, and there was a huge learning curve regarding the electronics that I added as well as the programing that was involved.  

But then, It was a great project that lasted well over a year, I made some good friends in the process, and I never lacked for something to do!

Thanks again for the feed-back!

Best,

Rick

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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