emradguy Senior Member Joined: 31 Mar 2011 Posts: 1,723 Location: Houston Expertise: I live coffee
Espresso: Izzo Alex Duetto II Grinder: MacapM4T, Macap M4, OE Lido,... Drip: Espro press; Aeropress Roaster: internet
Posted Tue Jun 26, 2012, 8:18am Subject: Re: Double shot - tamp line
Until you get a scale, try filling your basket, without tapping and adding more grounds. Then level it and tamp as otherwise normal. Then do the nickel/dime test as Wayne suggested (above). You should be pretty close to where you ought to be on a Silvia (assuming you're using OEM pf and baskets). Adjust your grind fineness to achieve the desired extraction time.
j123 Senior Member Joined: 15 Sep 2009 Posts: 56 Location: US Expertise: Just starting
Posted Tue Jun 26, 2012, 8:55am Subject: Re: Double shot - tamp line
Thank you for the replies. To be clear, the screw extends past the screen by a couple coins thickness. Should the puck just touch the screw, which would be a couple coins thickness from the screen or should a dime fit between the puck and screw which would be a decent amount of space between the puck and screen?
I do have a scale. Earlier on I weighed out 14 grams but that always seemed to create a fairly high tamped puck. It is the oem double basket
tracerbullet Senior Member Joined: 13 Feb 2012 Posts: 152 Location: Saint Paul Expertise: I love coffee
Posted Tue Jun 26, 2012, 1:39pm Subject: Re: Double shot - tamp line
Strange setup. Looking online for pics I see what you mean.
I would say you need to just avoid touching the screen. For most folks the screw head is perhaps a mm, if that, beyond the screen. So saying not to touch it and not to touch the screen are sort of interchangeble. Pics of some Silvias do show a very oversized screw / bolt in that area, big enough that you could get a wrench onto it. In this case I believe the screen is fundamentally what your'e trying to avoid.
Some of those pics brought up online are from people converting that bolt to a screw. Makes snese to me, once you've packed / tamped the coffee into the portafilter, I can't imagine wanting to jam a hole into it like that. Seems like a great way to undo what you've done and get the water channeling through the grounds unevenly.
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