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Where did the holy 9 bar of pressure for espresso come from?
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From my experience it seems that everyone is happy with changing everything such as extraction times, dose ins and outs, temperature, flow rates etc but the line pressure doesn't seem to get mentioned. The 9 bars of pressure has been the number since pumps could get a consistent pressure in machines but how do we know that's the ideal pressure for different coffees and even different machines?
Top Comment:
Pressure doesn't get mentioned because, for the most part, pressure isn't worth mentioning.
...It's not that 9 bar is or is not or could be "ideal" - instead, getting "ideal" pressure makes next to no difference so fussing about it is pointless.
Except for when it really matters, so I'll cover outliers first. Something super high pressure like 12 or 14 ... tastes pretty brutal. Brew a super excellent shot and get it to all work out really well and it's still pretty harsh and astringent and not particularly nice to drink - higher pressures overextract faster. Brew a coffee below ~7 or so, and you don't form the colloids needed for espresso or crema - you get moka pot instead.
But within that range - "pressure profiling" for espresso machines was The Fucking Rage like two to four years ago. Everyone got their dope super-high-end machine that totally lets them profile pressure down to the tenth or the hundredth of a bar and started trying to absolutely optimise their espresso and ... nothing happened.
Turns out as long as your ballpark is correct, anything else you might do will have a bigger impact than solely adjusting pressure. The taste difference of finding that quarter bar adjustment that's absolutely brilliant for this particular coffee ... negligible. Not even big enough gains to tip a bubble competitor into a winner at the competitive level.
So we end up orbiting back to 9 bar, much more confidently able to say "approximately 9 bar" than before ... but the big thing we learned was that it's not worth trying to learn much more. 9 bar is a good compromise where you don't have enough pressure to make channeling a huge threat on every single non-ideal puck, while still being high-enough pressure to get a reasonable speed of extraction and not risk much cavitation instead. On any given espresso, adjusting by a few points of a bar might 'optimize' your shot further ... but not by enough to make the time and effort investment worthwhile.
3 9 2021 - Weekly Souki Coffee Talk
Main Post: 3 9 2021 - Weekly Souki Coffee Talk
Top Comment:
We need LNG, no ifs, ands, or butts about it! If my wife wouldn’t kill me, I’d buy 5,000 more shares now!
This Is How Much Coffee the 'Friends' Drank in 10 Seasons
Main Post: This Is How Much Coffee the 'Friends' Drank in 10 Seasons
Top Comment:
I dont think thats accurate. What about that episode when Chandler broke up with Janice?
Phoebe: How many espressos have you had?
Chandler: I dont know. A MILLION!
I think that episode was omitted.
This Is How Much Coffee the 'Friends' Drank in 10 Seasons
Main Post: This Is How Much Coffee the 'Friends' Drank in 10 Seasons
Top Comment: It's surprising that rachel, who worked at central perk the longest (I think Joey had a short stint there if I recall), drank the least amount of coffee. Also, why does Ross, the largest friend, not simply eat the other friends?
SPOILER Just finished ep 9 (Coffee, Black) and am confused.
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Am I the only one confused by the ending? Where Marty doesn't turn in Ruth and instead they hug it out? Is she playing him? If she is then why go so far as to kill her uncles? Did I miss something?
Top Comment: Why would he turn her in, when she just saved his life? He would not benefit at all from turning her in, it would probably turn out worse actually as Ruth could out his entire operation. It would make 0 sense for him to do that. Ruth did it because she knew what her uncles were going to do, and she knew that Marty was actually a decent human (to her at least).
Day[9] proves that theres only coffee in his cup
Main Post: Day[9] proves that theres only coffee in his cup
Top Comment:
I fucking love this guy.
Rick and coffee
Main Post: Rick and coffee
Top Comment: This had a bizarre set-up but the punchline was totally worth it.
Ryzen or Coffee Lake?
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Hello! I'm currently deciding whether to buy an R5 1600 or 8600k. The main purpose of the PC will be probably gaming in 1080p/60fps (not pissed about turning some settings down), 3D modeling and light video editing. My main concern about Coffee Lake is the platform lifespan. I'm afraid of not being able to upgrade to a better CPU after some time and with AMD's promises about platform support up to 2020, I'm leaning to AMD side. I'm keeping some old hardware like the GPU (just for a while, don't worry) and a 500W Seasonic power supply.
The build:
*AMD Ryzen 5 1600
*ASUS Strix B350-F
*G.Skill Ripjaws V 2x8GB 3200Mhz CL16
*ASUS GTX 750Ti OC
*Seasonic 500W (non-modular)
*Fractal Design Meshify C
Thank your for your advices :).
Top Comment:
With a 750Ti your CPU does not matter whatsoever in gaming. The GPU will be the limiting factor. So I’d go for Ryzen for double the threads, a cheaper price, an included cooler, and better platform longevity.
You would have to step up to a 144Hz gaming monitor and a high-end video card for Ryzen to limit you in gaming. For your needs, shooting for 60 FPS with a 1050Ti or at least an RX 560 would make the most sense. (You’d have to turn down the graphics with both, but much less so with the 1050Ti.)
Episode Discussion: S01E09 - Coffee, Black
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Season 1 Episode 9 - Coffee, Black
Russ learns Agent Petty's true identity and makes plans to murder, steal and flee. Wendy stumbles on an ideal business to add to the Byrde portfolio.
What did everyone think of the ninth episode ?
SPOILER POLICY
As this thread is dedicated to discussion about the ninth episode, anything that goes beyond this episode needs a spoiler tag, or else it will be removed.
→ Link to S01E10 Discussion Thread
Top Comment:
There's always money in the blue cat.