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Sunbeam 4800c Gauge & OPV Upgrade! Making very good shots now!

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  • #31
    the next mod will be to control the pump speed during extraction, to allow for pre-infusion at 9 bar and lower pressure extraction in the back half of the pour

    around 5-6 bar just enough to keep the small trickle coming. The result is trying to copy what a good lever machine does.


    quote-
    I still get flow at the very slowest setting even though you can barely hear the pump (very quiet). And the pressure is variable from about 1 bar to 9 bars (where the OPV is currently set). And it is very smooth (even though in the video my gauge is jumping all around - I think I had air in there).

    I have been getting the best espresso I've ever had - very different from what I was getting before. And it has really widened the range of coffees I can use for espresso. I'm now doing some lighter roasts that would be way too bright if pulled at 9 bars. When I start out at 9 (just bring it up to 9 bars long enough to get the pour started) and then back down to 4-5 bars to keep the pour barely trickling, I get much more creaminess and rich deeper tones in the cup and much less of the citrus peel.

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    • #32
      Click image for larger version

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      I managed to get it done, the plumbing was easy, just Teflon tape and no leaks first time.

      Cutting through the Stainless steel casing was a bitch though!

      yeah, shots are very smooth now, and the pump is very quiet too.

      Thanks to Karl for all the help.......

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      • #33
        Hi C-man, I'm considering doing this to my Breville ikon (not sure if it will all fit?).

        Just wondering what parts you went with in the end and the costs?

        thanks

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        • #34
          I used the same parts Karl suggested, he listed them above

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          • #35
            cheers C-man - which gauge did you get, RS Components?

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            • #36
              Originally posted by hotjava View Post
              cheers C-man - which gauge did you get, RS Components?
              I can't remember but I had to wait a week as it came from OS

              I wanted the gauge with the tubing already connected to make things easier.

              have a look at my thread below "Suoed-up Sunbeam "slayer style" for some other mods

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              • #37
                I've decided I'm going to attempt this with my E4800.

                Was shipping expensive from stefano's?

                C-man, it appears you used the Vibiemme valve from the photos. Did you try and get the Exopar from Disave espresso parts?

                jet black espresso in sydney has a generic expansion valve listed on there website for $25.60. But its unclear whether its adjustable like the Vibiemme.

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