dlk7u Senior Member Joined: 21 May 2013 Posts: 17 Location: NYC Expertise: Just starting
Posted Mon Jun 24, 2013, 7:21pm Subject: Re: Baseline settings for Crossland CC1
Thanks! The change-at-the-boiler-but-not-the-grouphead is basically what I was expecting.
Silly question: is there one component of the espresso flavor that is typically affected by the pre-infusion time? What about the wait time? I'm guessing this varies a lot for different beans, but was just looking for a basic rule of thumb.
D4F Senior Member Joined: 15 Mar 2012 Posts: 1,878 Location: USA Expertise: I like coffee
Espresso: Gaggia Classic PID Grinder: Preciso
Posted Mon Jun 24, 2013, 7:51pm Subject: Re: Baseline settings for Crossland CC1
I've noticed a sizable drop in boiler temp from a 3 sec flush, presumably from room temp water being drawn into the boiler. I'm wondering how this relates to the (pretty flat) temp curves at the brewhead that Dean observed using a thermocouple. Is the answer that this (mid-brew) drop at the boiler doesn't affect the temp at the grouphead (and therefore isn't something to worry about)? I think this shows my lack of understanding of boiler/grouphead design.
The unimpeded flow rate of a typical vib pump is about 10 cc/sec, 600cc/min. A flush puts most a pull worth of water through the system in a few seconds vs 25 - 30 seconds for the same volume. The system is not designed to heat at that flush rate.
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