Re: Pressure Profiling Update 3

On Fri, 30 Mar 2007 19:17:36 -0400, "Jack Denver"
<nunuvyer@xxxxxxxxxxxx> wrote:

No, it's not just Elektra - I haven't compared them side by side but the
block on my NS is also thicker than it would appear to need to be for its
function and judging from the drawing about the same thickness. Could it be
that they are purposely taking up space so to get the shower screen down
closer to the top of the puck and not leaving headspace which as you said
would end up filled with brewed coffee? Or they are adding more thermal mass
to the group? There must be some good reason for it because manufacturers
are no know for building parts heavier than they need to be.

You could be right. The block on the E61 is small, about the size and
thickness of a quarter. This does point to thermal management -- on
lighter weight or non thermosyphom groups, it may be designed to soak
up the initial overheat of the water and then stabilize the thermal
fluctuations. Having the a relatively small weight so closely linked
to the flow may be just as effective as having a huge mass in the
group envelope. That would make it an economizing move.

The time line is also telling -- the heavy blocks are later
developments, going with the lighter weight groups, while the early
lever and faema groups (e61 and non-stop) have small blocks and lots
of mass.

The alt.coffee myth, aided by Schomer's writings, is that Italian
espresso design became progressively more mediocre in the 70s and 80s.
I think this is mostly a myth -- I think that the designs and coffees
were economically constrained to be inexpensive, but the sort of "race
to the bottom" we saw in post war US coffee didn't occur. The entries
that Brasilia and NS knocked out in short order for the WBC are a case
in point.
.

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