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Permalink Reply by Valentin David on February 14, 2009 at 5:14am

I think most of machines have a pump that does over 10 bars. And then they reduce it with an OPV. At least these two machines do. What you can see from other forums around the Internet is that you can modify the one on the Rancilio Silvia if you are not happy of the configuration from the factory. Are you looking for a perfect 9 bars machine?

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Permalink Reply by Pangi on February 14, 2009 at 7:07am

From what I've read optimal bar pressure is about 9 bar.
The latest Silvia has a pump capable of pushing 15 bar.
Silvia machines built prior to 2005 had problems with the brew pressure being too high (around 11)
Post 2005 after adding an Over Pressure Valve (OPV) they do around 9-10. As Valentin noted the beauty of the OPV is that it is makes it possible to set the brew pressure to what you want it to be.
Here's some reading: http://coffeegeek.com/proreviews/firstlook/ranciliosilvia/details (last paragraph before "First use ...."
http://www.home-barista.com/espresso-machines/brew-pressure-for-ran...
Instructions on how to make the adjustment: http://www.home-barista.com/espresso-machines/adjusting-rancilio-si...
Peace

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