When does brew timing start?

by **joshem** on Fri Jul 08, 2011 6:40 pm

Hi,

I had a play with my Gaggia Classic today turning the OPV 180 degrees counter clockwise. The espresso is much better, thicker and creamier. I haven't got a pressure gauge so tried the return flow thingy (using a blind basket) for 30 seconds and I think I'm in the ball park of 120ml. What I would like to know is: does the 30s start when you press the brew button or when you first see water coming from the tube (which is around 8 seconds after the brew switch is turned on)?

Thanks,

Josh

by HB on Fri Jul 08, 2011 7:22 pm

Most agree "pump on". The flow from the over-pressure valve begins shortly after the brew chamber has fully pressurized. On your machine, the 8 seconds beforehand is the dwell time during which water is wetting the puck (preinfusion), so it's included in the brew timing. See When do you start to time the shot? for recent discussion.


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