mmuir Senior Member Joined: 8 Jul 2012 Posts: 2 Location: Maryland Expertise: I love coffee
Posted Wed Jul 18, 2012, 2:31pm Subject: Inconsistent first shot
I have a NS Oscar and a Rocky grinder. Whenever I go to pull the first shot, it takes a few seconds with nothing coming (as it should) and then the next 10 seconds or so consist of a dark syrup which is then followed by a very fast stream of light liquid. Without changing my method, the problem always resolves itself on the second pull when (after ten seconds) the color and speed is consistent throughout. Any ideas what I'm doing wrong?
Thanks. I let it warm up for around 30 minutes and then vent some pressure and let it heat up again for a minute or so, then I flush the group head (for about ten seconds) then grind, tamp and pull the first shot. I'm not totally sure what other details are relevant, let me know if there's anything else that would be helpful.
After starting the pump it should usually take 5-7 seconds before the first drop of espresso starts to flow, which should then quickly become a steady mouse tail stream. It's normal for the colour of the stream to change when the crema starts to come out. The difficulty is to distinquish that from blonding. The shot ought to be finished about 25 seconds after starting the pump.
The cooling flush should last until a single steady stream of hot water comes out without any sputter.
Can you post a video of your shots?
*** "This drink of the Satan is so delicious that it would be a shame to leave it to the infidels." (Pope Clement VIII on coffee, when he was urged to ban the beverage)
Once you start to get pressure in the boiler, about 10 minutes or so, you should at that time bleed off the false pressure then let the machine continue to warm up for about 20 minutes, not the way you said you do. A great mod is to add a vacuum breaker to the brew system, this gets you away from the need to bleed false pressure AND it will allow you to put the machine on a timer for better ease of use.
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