Vball5153 Senior Member Joined: 9 Dec 2003 Posts: 40 Location: Cincinnati Expertise: I love coffee
Espresso: Isomac Millennium Grinder: Solis
Posted Sun Oct 27, 2013, 11:02am Subject: In Search Of 9 BAR
I bought a Breville Dual Boiler. Ideal double shots should pass through at 9 BAR in about 30 seconds. The house espresso blend from my local roaster does not provide enough resistance for the pressure to get anywhere near 9 BAR. And that's at the finest grind - a zero - through my Baratza Plus with an extremely firm tamp. The extraction time is under 20 seconds. So you'd think it's a Baratza or Breville problem. It's not. The Breville rep sent me a pound of a coffee he said works perfectly with their Dual Boiler. That blend, ground at a #3 on my Baratza and with a normally firm tamp, passed through at 9 Bar in 30 seconds. If this helps solve this puzzler, the beans Breville sent me are called Black Cat Classic Espresso. A line under that shows: Yellow Bourbon, Caturra, Catuai, Villalobos Grown at 1200 - 1900 M. Works perfectly as promised. But I don't want to buy beans mail-order. Any suggestions on a normally-found bean or blend that provide more resistance, while delivering a classic espresso taste (as personal as that is)?
MerleApAmber Senior Member Joined: 13 Nov 2012 Posts: 236 Location: Atlanta Expertise: I love coffee
Espresso: Breville BES920xl Grinder: HG-One, Baratza Preciso +... Vac Pot: Yuma Drip: Pour over: Melita Ceramic Roaster: Hot Top 2K P
Posted Sun Oct 27, 2013, 8:31pm Subject: Re: In Search Of 9 BAR
If you are not resolving the pressure issue by varying mass of the charge before over filling the basket, or adjustment of the grinder itself; I'm thinking grinder fail. I've seen Starbucks French Roast work at 16.5 grams, Lavazza work at 18.6, and house roasts go 20+ grams to make 9 bar. Each coffee requires slightly different grind adjustment to do the job. If after all that you still can't get to your extraction times, you'll need to consider the grinder you have isn't up to the task, and, check your observations by using a known industry standard grinder. Good hunting, remember coffee is the journey! (Ya, platitudes suck.)
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