John_ Senior Member Joined: 12 Jan 2007 Posts: 225 Location: Atlanta Expertise: I like coffee
Espresso: La Spaziale, Cremina, Baby... Grinder: Mazzer Major, Olympia...
Posted Wed May 13, 2009, 11:02am Subject: A new way to make espresso?
I stumbled on an interesting machine called the Bacchi Espresso, and was wondering if anyone has had a chance to try it? It's not clear if it is a moka pot or something more ...
morgan_greywolf Senior Member Joined: 27 Feb 2009 Posts: 155 Location: Hudson, FL Expertise: I live coffee
Espresso: PID'd Hamilton-Beach Grinder: Infinity, Zassenhaus Vac Pot: I was told they suck. :-) Drip: AeroPress Roaster: Cattle Dog Roasters
Posted Wed May 13, 2009, 12:00pm Subject: Re: A new way to make espresso?
John_ Said:
I stumbled on an interesting machine called the Bacchi Espresso, and was wondering if anyone has had a chance to try it? It's not clear if it is a moka pot or something more ...
Since I don't speak Italian, I'm at a bit of a disadvantage, I don't see how it could build up the requisite 9 bars of pressure required for espresso using only steam.
BTW--the grinder in the video looks an awful lot like the Vanelis Mini Pro II.
Edit: They do claim 8-9 bars and a stable temperature of 85-90 C. No idea how that is accomplished and they do not really explain it other than saying it uses valves.
Posted Wed May 13, 2009, 1:30pm Subject: Re: A new way to make espresso?
Interesting looking machine.
It claims to have a 'pressure multiplying' chamber. Looks like the chamber you fill with water.
I can't see how it would develop more than steam pressure unless the pressure multiplying chamber does something special. 9 bars is a lot of pressure for a boiler to build up to. I know nothing other than when you put water under pressure it increases it's boiling point. Whether a stove top boiler could support 9 bars safely I wouldn't know either.
I would have to guess that the machine probably doesn't get higher than steam pressure. It's probably more of a moka pot than a real espresso maker.
I disagree. Colors on a computer screen are very unreliable (especially given compression of video for the internet, and that the video was most likely captured with a digital camera that your screen hasn't been calibrated for) so you can't really use that. Watch what happens when the sugar is added, though. I used to get very similar-looking "crema" with a steam toy.
It has separated the steam chamber that generates pressure from the actual brew water. Theoretically, you could fine tune the design to give you the correct heat conduction for brewing temp that is "just right".
You could multiply pressure using a piston with ends of unequal diameter. Much the same way your Car brakes work. Seems like that's what they did here.
I guess high school physics comes in handy once in a while :)
Would be a nice toy:) Where are they selling this and how much for? Looks like the site isn't ready to sell.
Posted Wed May 13, 2009, 6:09pm Subject: Re: A new way to make espresso?
Alfonso said it first. Neat. Probably works like an old hydraulic espresso machine that used mains water to generate the 9 bar of pressure. (1 bar on a piston of 10 sq cm = 10 bar on a piston of 1 sq cm)
morgan_greywolf Senior Member Joined: 27 Feb 2009 Posts: 155 Location: Hudson, FL Expertise: I live coffee
Espresso: PID'd Hamilton-Beach Grinder: Infinity, Zassenhaus Vac Pot: I was told they suck. :-) Drip: AeroPress Roaster: Cattle Dog Roasters
Posted Wed May 13, 2009, 6:36pm Subject: Re: A new way to make espresso?
geoffbeier Said:
I disagree. Colors on a computer screen are very unreliable (especially given compression of video for the internet, and that the video was most likely captured with a digital camera that your screen hasn't been calibrated for) so you can't really use that. Watch what happens when the sugar is added, though. I used to get very similar-looking "crema" with a steam toy.
Yeah, I thought of that after posting it. As a former professional graphic designer and a current expert in IT, I can tell you that you are, unfortunately, 100% correct. My current display is not calibrated for anything at all right now, it's just at defaults. Haven't done truly calibrated professional photo editing in years, working mostly with Web stuff these days and, well, you can't really calibrate for the Web, it's a curse of the media. :)
Furthermore, closer examination of the video definitely reveals editing of the coffee brewing cut-scenes.
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