We're using a Mirage espresso machine at our shop. I recently had the pre-infusion chambers installed. Before we were timing our shots at 2oz in 27 seconds. I would notice that the pour would begin at approximately 6 seconds. Now, with the pre-infusion, the shots begin closer to 10 seconds and by the time it reaches 2oz, it runs over 30 seconds. When I make the grind more fine, it appears thin and blonde.
For those using a pre-infusion machine, are your shot times longer than the traditional 25-30 second time?
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