Progressive Pre-Infusion and shot times
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?
Replies to This Discussion
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Permalink Reply by Eric Schaefer on
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No experience on Mirages, but on Synesso Hydras with bypass pumps (4-stage pressure-profiling system,) every increase in pre-infusion time or in "stage 2" time (partial-pump-pressure between line pressure and full pressure, typically 7.5 bars) results in longer shot times to reach a similar flavor profile. It's not at all unusual for us to have 32-35 second shots with no hint of over-extraction. The balance is in most ways comparable to what you'd expect from 27-29 second shots without any profiling.
As another example, a built myself a machine for home use out of spare parts and initially got my best balance with shots just under 30 seconds. However, I had some issues that led me to try adding a flow restrictor which basically created a brief pre-infusion (4 to 6 seconds before it approaches full pressure at the puck) and found that the timing for my most balanced shots shifted back to a little over 30 seconds.
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