tkenny53 wrote:on my E-61, I raise the lever about half way, and I get water flow without the pump, I have a plumbed in system.
Ok, I definitely don't on my machine.
cmin wrote:So your saying your 700 won't pre-infuse on reservoir or plumbed in? Something is wrong then, E61s preinfuse either way but do work better from the water line pressure when plumbed in.
Well I'm not sure if it's "wrong" or not but one thing is certain: my Pro 700 won't let water through the group before the pump is turned on. I've seen a video (don't have the link at the moment) posted with someone doing a "3-sec pre-infusion" with the Pro 700, hence me scratching my head.
HB wrote:Not to put too fine a point on it, but that's referring to the expansion chamber whose operation is defined in the E61 patent, not "prewetting" under line pressure from water dribbling into the brew chamber prior to pump activation. Some E61 groups do that, most don't.
Oh, then it's kind of reassuring. However I really thought pre-infusion *was* pre-wetting the grounds.
However the quote on the the Pro 700 spec list specifically mentions wetting the grounds. That being said, I don't thing this "spec" is from Profitec so perhaps it was an extrapolation from the vendor -- that particular copy seems to come from WLL.
HB wrote:If you want to experiment with prewetting on an E61, adjust the pump activation plunger to delay the pump-on position until the brew arm is higher. Or just cut power and lift the lever up all the way, then power on to start the brew cycle. For what it's worth, I didn't find much benefit from prewetting... maybe reduced channeling? In my limited experimentation, I found too much prewetting/preinfusion would muddy the taste profile.
Those are great ideas, I'll try operating the lever with the power off tonight... but I think I already did during the plumbing process and nothing comes out. Anyway, thanks for the clarification.