Rancilio Silvia Mega-Mod part 6 Pre Infusion

by Updated: Apr 9, 2020diy-coffee0 comments

Avi's Silvia Mega-Mod

My way to a better coffee...

DISCLAIMER - Important!

The pre-infusion feature which is common in high-end machines prepares the coffee puck in the basket just before the brewing by delivering a small amount of water, enough to just wet the coffee cake prior to brewing. This technique is said to improve the shot taste.
To be honest, I tried it manually few times in Silvia but didn’t notice any difference in the shot taste.
Anyway, since I was deeply into this project, I also added this feature.
Unfortunately, the timer that I used does not have this ability. It might be possible to change its software to do so but this is beyond my knowledge.
Getting a controller that is capable of doing pre-infusion meant additional $250 that I was not willing to spend.

So, I decided to do it manually with the help of a simple momentary push-button switch.
Silvia brew switch that operates the pump is a rocker type switch. This kind of switch is not meant for short momentary operation. Timer mod is already taking control of the switch, so all was left to get the pre-infusion function was to add a momentary
push-button switch. I added the button to the control box and connected it to the timer controller output.

Each momentary push operates the pump for a very short time and few quick clicks make the pre-infusion effect. Yes, I know this is a kind of degradation with all the controllers around, but at least I have it in case I want to use it.
Eventually, I use it rarely. As I wrote above, I personally do not find any improvement in shot taste with this function on Silvia.

Pre-Infusion switch on control box
Pre-Infusion switch on the control box
tipTip: This mod is relevant (without additional components) for the Watlow 935 timer controller, if its 2nd output is a D-type.

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electric hazard sign


1. Silvia runs on high voltage.

Any modification made to your Silvia may cause damage to your equipment and harm to yourself or to others. 
Any modification made to your Silvia will void manufacturer warranty.
None of the following mods is recommended by me nor by the manufacturer, Rancilio. 
These pages show only my personal experience and know-how.
If you follow any of the mods, you do it on your own risk and responsibility.

2. Copyright © 2011 Avi. All rights reserved. 

Content including all text and images in part or in whole may not be reproduced, retransmitted, stored, distributed, disseminated, sold, published, broadcast or circulated in any medium
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