ElBean wrote:Interesting, Jon, but what do you mean "i do this until the pump hits full pressure"?
My pump is at full pressure as soon as I raise the lever.
mine will show 8 bar with nothing in the group.
then with a shot or blind filter the pressure will say 8bar then it will go to 9 bar when the pre-infusion is over. that is what i mean by hitting full pressure. watch your gauge. unless i am mistaken this is the e61 pre-infusion happening. after a few seconds, you can hear the pump go under load. the pump sound changes, wait 2-3 seconds and stop the pump. wait 10-15 seconds do it again.
this is done with a blind PF disc in the basket so i can use the same PF for the shot.
vitals on my vetrano.
pstat - .9 - 1.2 bar
main lines pressure - 3.5bar (unless some one re-fills the washing machine 2bar, even with regulator installed)
brew pressure 9 bar
group temp at long idle 45-60 minutes - 210°
basically using erics chart and the fact of the 4° difference between the probe and the puck. i can PRETEND to do a shot see its temp on the probe, subtract 4 and know the shot temp. since there really isnt a shot in there i can abort the pretend flush-shot and pretend to make another shot until i can see the machine is at the proper temp.
this is similar but different to making 2-3 shots just to dump them. these shots were sacrificial just to cool the machine.
the machine is built to make shots without flushing unless it sits for too long so you have to pretend you pulled some shots.
i wish i could explain this better. anyone want to come on over?