So in reality what I needed to do was dial in my grinder to ensure my extractions were running somewhere between 30-40 seconds in total. Between pushing the button and coffee dripping in to a glass shot - it is a pre infusion/pre extraction time about which is written above :) That’s what I … Pre-infusion is a process built into espresso machines where hot water is applied to the ground coffee for an initial period of time but at a pressure that is much lower than the ultimate extraction pressure. The current standards for espresso across the United States can arguably be defined by 30-second shots using a 1:2 coffee-to-water ratio. Both chemically and physically, there’s a lot going on inside that coffee puck when you pull a shot. https://perfectdailygrind.com/2017/04/espresso-making-skills-whats-pre-infusion One reason for this standard can be traced back to Andrea Illy’s book, Espresso Coffee: The Science of Quality written in 1995.In the book, Andrea suggests that espresso extraction should be around 30 seconds with a 1:2 ratio. So the more you pre … This is because time and extraction aren’t linear with espresso brewing. More on that later. What happens when you pre-infuse for extended periods, is that the subsequent extraction is sped up. The pre-infusion of espresso involves pre-wetting the roasted, ground coffee in the portafilter basket before you begin brewing the espresso. Ah, gotcha. This isn’t a hard and fast rule, but will certainly apply to most coffees. If the time is too long, the espresso will be bitter and harsh. Posted March 2, 2012 link. And if he's not following a recipe he has to start over from the beginning and follow the advice from the other threads. The way I think about pre-infusion, is that it is a sort of "helper". Once you think you have the temperature and dose down, test different seconds worth of pre-infusion, between 2-10 seconds. The goal is to improve the overall extraction of the finest flavors and aromas from the roasted and ground coffee. For my machine and coffee the solution was to ensure that my 22-30 second extraction rule was still applied but being mindful not to include the pre-infusion in this time frame. So immediate insert and brewing (push the button) and the extraction is started (the clock is ticking ;) ) and U can start time the extraction time. Espresso can easily become a rabbit hole that’s easy to dive down into. – avocado1 Sep 11 '18 at 12:35 Taste each, and take notes! Complicating it even more, how the water hits the dry grounds at the start of the extraction will be very different from how it behaves just five seconds later – and this impacts the flavor of that espresso. Pre-infusion has a big impact on the flavor your final cup, giving you more control over the extraction process and overall clarity. You can make good espresso with almost no tamping. Espresso extraction might be quick, but it’s not simple. It depends on the espresso, temperature, dose, and so many other factors. If he follows a recipe with a specific dose, it is the grind size. In addition to the seven fundamentals of brewing, there is also the matter of pre-infusion, often referred to as a "bloom." You’ll notice that I don’t refer to longer times creating higher extractions and vice versa for short times. Basically, it allows water into the chamber at line pressure (i.e. I understand how pre-infusion helps, by presoaking the grind, but not how it affects the actual shot time. 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