<p>I was actually reading an <a href="https://compoundcoffee.com/experiments/13_Pre-infusion-and-its-impact-on-espresso" rel="nofollow noreferrer">article</a> on this yesterday. There is no added volume during pre-infusion. All the pre-infusion step does is wet the espresso fully to prevent channeling.</p>

<p>The article I linked actually shows that less extraction happens during pre-infusion. So to answer your question, it does affect the shot, but not the volume.</p>

CC BY-SA 4.0
2019-04-23T12:58:44.767Z
2019-04-23T12:58:44.767Z
SaggingRufus
<p>The espresso machine I use at work has a pre-infusion step. I've been wondering if the volume of the pre-infusion affects the shot, especially the pressure of the main extraction.</p>

CC BY-SA 4.0
2019-05-24T17:57:45.260Z
What do you mean by volume? On my automatised half-automatic, I can only set pre-infusion time and pressure. A bit of espresso starts to come through after about 7 seconds of my 9-second pre-infusion.
JJJ
<espresso><extraction>
How much volume of the shot should pre-infusion take up?
FrenchDavid50
# How much volume of the shot should pre-infusion take up?

(Asked by: username_0 on 2019-04-05)

The espresso machine I use at work has a pre-infusion step. I've been wondering if the volume of the pre-infusion affects the shot, especially the pressure of the main extraction.

**Tags:** espresso, extraction

> **Comments:**
> **username_1**: What do you mean by volume? On my automatised half-automatic, I can only set pre-infusion time and pressure. A bit of espresso starts to come through after about 7 seconds of my 9-second pre-infusion.  

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## 1 answers

### Answer by username_2 on 2019-04-23. Score: 1

I was actually reading an [article](https://compoundcoffee.com/experiments/13_Pre-infusion-and-its-impact-on-espresso) on this yesterday. There is no added volume during pre-infusion. All the pre-infusion step does is wet the espresso fully to prevent channeling.

The article I linked actually shows that less extraction happens during pre-infusion. So to answer your question, it does affect the shot, but not the volume.


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