I finally got a pressure gauge from CP and constructed a Group Head pressure tester using an old portafilter. Tested it out on my old (1997) Brasilia Portofino 2 Group. Was able to easily adjust the pressure by turning the screw on the top of the acorn on the Procon rotary pump. As expected turning clockwise increased the brew pressure at the group head and I was able to get pressures varying between about 6 bar and 11 bar.
What is puzzling me is that I had trouble getting consistent readings. I would adjust one GH to 9 bar and then go to the other GH and get an inconsistent reading. I even had trouble getting consistent readings at one GH. Tried two ways - adjusting the screw while pump was operating and adjusting the screw before switching the pump on (pressing the brew button).
The GH seals seemed fine and were not leaking.
Has anyone got any ideas on what might be happening?
TIA
What is puzzling me is that I had trouble getting consistent readings. I would adjust one GH to 9 bar and then go to the other GH and get an inconsistent reading. I even had trouble getting consistent readings at one GH. Tried two ways - adjusting the screw while pump was operating and adjusting the screw before switching the pump on (pressing the brew button).
The GH seals seemed fine and were not leaking.
Has anyone got any ideas on what might be happening?
TIA


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