Hi,

When using a blind portafilter, my static pressure at the brewhead is increasing past 9 bar (up to 11 bar) whereas the pressure at pump is staying steady at 9 bar. Sometimes, however, the pressure at brew head will stay et 9 bar. In other words, despite not changing the pump pressure, my pressure at brew head will sometimes be the same as my setting at the pump and sometimes it will creep up past 9 bar.

Does anyone know why this is? I just installed a flow control with the stiffer spring on my synchronika.

I found an article explaining this phenomenon. Tried to delete the thread but looks like need a mod.

http://coffeetime.wikidot.com/pressure- ... g-pressure

Thanks for the link to this article! I never really understood this phenomena, but this does help clear things up.