I have a Espresso machine (Rocket R58).
I'm curious why my pour starts to drip halfway the pull. Is there any explanation why halfway and not from the get-go?
I do understand I need to go more coarse to fix this...
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It's the pre-infusion feature of your machine in conjunction with the grind you were using. From their site:
Pre-Infusion: To extract the full flavor and aroma when you brew your espresso, the R58 has a dual pre-infusion system encompassing a working piston and static pre-infusion chamber.
Most machines that have this feature understand that the pre-infusion is done based on the amount of water that has flowed, not how much time has passed (which is a good thing). So, if the puck is too dense, it can take quite a bit of time.
Adjusting grind a bit should fix it.
There may be some advice on this. My first will be to check the pressure as you can do this with your pretty machine. Please check if you are around 9 bars when pulling the shot.
One reason of delay is, it takes a while for the water to wet the grounds. So, it is normal to wait for a few seconds to see the first drops. However; if it is more than a few seconds, the most possible problems I can think of are: