Announcement

Collapse
No announcement yet.

Expobar Office watery extraction & way too fast

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    It's very unlikely to be a problem with brew pressure, because if you're getting those kinds of flowrates you probably don't have enough resistance to even reach 9 barg (I'd have to see the pump curve but I don't think a vibe pump will do 420 mL/min at 9 barg).

    Flow and flow resistance drive the pressure, it's NOT the other way around.

    Comment


    • #17
      Originally posted by MrJack View Post
      Flow and flow resistance drive the pressure, it's NOT the other way around.
      Particularly with a positive displacement pump...

      Mal.

      Comment


      • #18
        Originally posted by MrFreddofrog View Post
        You're right of course, fresh beans won't account for 600% though it will/should account for a fair portion. With your new batch of beans, what is the roasting date? Fresh is a relative term so knowing the actual date is more useful that someone claiming it is fresh.

        I've got a brand new BCG820 grinder and even on it's finest setting it's not fine enough. I had to do some Breville authorised mods before I could get a sub 30sec pour. Point being just because you have it at the finest setting doesn't mean it is fine enough.

        Once you are tamping "hard enough" further pressures has minimal effect. BTW what do you mean by "really hard"? Tamp on a set of scales and measure it. The most commonly quoted amount of tamping pressure is 30lbs/15kg though I personally use a lot less than that but I dose differently to most people.

        Wrt to adjusting pressure, google how to get the perfect shot and count how many times people suggest changing pressure verses changing grind size, dosage, tamping & freshness. Simply put, it's not necessary.

        BTW I had a similar issue with my BCG800 grinder. We never solved the issue but believe it was due to static buildup, possibly due to the grounding wire breaking within the grinder.

        Yes you are right it did account for a fair portion with fresh beans. I checked today and they were roasted 5 days ago. The flow has come down to 120mls in 25 seconds
        I have had my Sunbeam EM480 since new but I know its limitations I am not expecting it to provide the same quality as a Vario or Macap it seems to be grinding fine enough though
        I set it on 4 & I just poured a shot about an hour ago and it is the best I have ever made on this machine and definitely cafe quality. So there is nothing wrong with this machine.

        It helped me watching this video
        How to make the perfect espresso at home

        I also found that the single basket I was using could have added to the problem as it is tapered at the bottom and the screen at the bottom is about half the size at the top
        (maybe creating channeling) so I am now using the double shot basket which is parallel & the screen is virtually the same size as the top. With the single basket there is a big chance of underdosing.

        At a guess I was tamping somewhere around 20kg.
        I cant wait to get the Macap M4D to see if I can get the pour down to 30mls

        Comment


        • #19
          I had a similar issue with the pour from an em480 suddenly increasing. Re seating the upper burr housing helped, but I didn't get it to grind as fine as it used to. Still got me stumped. Your new grinder will no doubt fix things. be mindful of distribution though, as channelling may creep in, and make you wonder what is going on all over again.

          Comment


          • #20
            There must be a standard flow rate that can be measured with no group handle on place.
            Finding that out and checking it would be a good start.

            Comment


            • #21
              Originally posted by trentski View Post
              There must be a standard flow rate that can be measured with no group handle on place.
              Finding that out and checking it would be a good start.

              That's a very good idea Trentski If I can find the spec of the the pump that would be a very good place to start to make sure the flow rate is as it should be.

              Comment


              • #22
                Originally posted by tobeanornottobean View Post
                I had a similar issue with the pour from an em480 suddenly increasing. Re seating the upper burr housing helped, but I didn't get it to grind as fine as it used to. Still got me stumped. Your new grinder will no doubt fix things. be mindful of distribution though, as channelling may creep in, and make you wonder what is going on all over again.
                Mine seems to be grinding fine enough as I am using it on 4 sometimes on 3. Coffee taste doesn't get any better by going finer so far.

                Comment


                • #23
                  Originally posted by muso44 View Post
                  That's a very good idea Trentski If I can find the spec of the the pump that would be a very good place to start to make sure the flow rate is as it should be.
                  Ulka or Fluid-o-tech?

                  Comment


                  • #24
                    Originally posted by muso44 View Post
                    Mine seems to be grinding fine enough as I am using it on 4 sometimes on 3. Coffee taste doesn't get any better by going finer so far.
                    Why does the fact your grinder is set to 4 (or 3) mean that it is grinding fine enough? Maybe grind a small amount, scatter it on some white paper and take a photo?

                    Comment


                    • #25
                      Expobar Office watery extraction & way too fast

                      Easy way to rule out the grinder:

                      Go to your local roaster, buy whatever the minimum is (eg: 250 grams).

                      Have the roaster grind them for you in their bulk grinder on the espresso setting.

                      Take it home and test.

                      Based on what you've told us to date, I think there's something amiss with your grinder.

                      Another option is to use the grounds from your grinder in a French press. If you can push the piston down, then it's not fine enough. An espresso level fineness will stop a French press in its tracks.
                      Last edited by herzog; 23 March 2016, 07:08 PM.

                      Comment

                      Working...
                      X