MediumRoastSteam it might be because the pressure decline is caused by the water leaving the group (through the puck) and so everytime at pressure x you will have volume y of water that went through the puck (assuming preinfussion is always the same)

I actually don’t know how pump machines do automatic shots. If they are doing it purely timer based it would be inaccurate, otherwise if they are doing it by measuring the flow of the pump minus the OPV volume that would give the same precision as pressure based in spring levers.

    I’m a little irritated by Lance Hendrick’s casual mention in his review that the Vostok operates at a peak pressure of around 9.5 bar. Given that the machine has two springs, this would be a bit surprising, especially as I was told otherwise by someone from ACS, but I must have simply misunderstood Lance’s review. After all, it also depends on the density of the puck, as the machine does not always reach maximum pressure.
    I also read in another thread that the Vesuvius Evo Leva operates at 11 bar. So I assume the Vostok uses the same springs.

    This was just something that puzzled me because I started to wonder why the spring pressure of home lever machines is usually lower than that of commercial lever machines, or am I misinformed?

    As far as I know, a commercial LSM group uses a spring with a max pressure of 11 bar, so the question that comes to mind is why do home lever machines operate at a maximum of around 9 bar?

    It probably has nothing to do with that, but could it be because traditional commercial lever machines were designed for much darker roasts? There was no market for light roasts back then. Or am I completely off the track here with my wild conspiracy theories?

    I could not test this with my hand lever machine as it does not have a pressure gauge. However, my experiences with pressure profiling show no better results with a higher pressure for dark roasts, but that does not mean that this is not the case for actual lever machines. As we all know, the world of lever machines is a mystery in many aspects.

      Nah he just made a mistake

      I questioned him on this and he said the machine said 9 bar.

      But it’s the same group and I usually hit 10.5 bar

      He also pulled his cup away alot lower in the pressure range than most of us do on the forum.

      I wouldn’t worry at all

      See the vid the gauge is over 10bar

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        I believe he didn’t have much time to play with the machine. However, I think the 9 bar was using probably the auto feature. The normal mode should get you 10.5-11 bars!

        @DavecUK What is the boiler capacity of Vostok please? Do we have the full features list somewhere ? Thx

          I thought it was the same boilers as the Evo?

          Decent De1pro v1.45 - Niche Duo - Niche Zero - Decent is the best machine ever made -

            DavecUK

            I’m pretty sure that you showed the auto shot control using pressure to finish.
            I think Jake wants to see it release pressure with a choked puck at peak pressure.

              Tiramigiu Lance Hendrick’s casual mention in his review that the Vostok operates at a peak pressure of around 9.5 bar. Given that the machine has two springs, this would be a bit surprising, especially as I was told otherwise by someone from ACS, but I must have simply misunderstood Lance’s review. After all, it also depends on the density of the puck, as the machine does not always reach maximum pressure.

              It peaks at 10.5 ish…I know because I did a video which shows it at the Trieste exhibition last October 22…someone has already linked to it. I wouldn’t call LH video a review, more a brief intro to a few of the features

              Tiramigiu Thanks for the clarification!

              I am asking for a dimension to be changed. The 467mm height of the rear part of the case, I would like to see it 447mm

              Tiramigiu As far as I know, a commercial LSM group uses a spring with a max pressure of 11 bar, so the question that comes to mind is why do home lever machines operate at a maximum of around 9 bar?

              The home machines are smaller and generally get a bit “tipsy” with the commercial springs in them. At this time I usually put up my favourite video .gif of a tipsy lever…but I don’t want to anger what would become a frenzied mob. 😁

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                      DavecUK

                      Can you clarify how you want the height changed Dave?
                      Is it by altering the feet/base or just the terminology as the top slopes down from nearly mid-machine?

                      Go on show us your GIFFy 😄

                          Amberale I basically want the front brackets a bit smaller, but i don’t know if 2cm can be lost there and the bending machine still create them. Then of course 2cm off the height of the rear feet.

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                              DavecUK

                              Excellent plan.
                              Stylistically, the space under the drip tray is the only thing that looks a bit unfinished.
                              I know the deeper drip tray will address this but dropping it all 20 mm works as well.

                              I am in the middle of replacing the 490mm deep bench top on my coffee sideboard with a 710mm one so it should fit.
                              Building a new steel 650mm deep base on wheels is jut as important to maintain stability.

                                DavecUK Thanks for the clarification! I can understand it, but not entirely. Pressure obviously plays a crucial role during extraction. So is it really something that can be compromised on without sacrificing too much in terms of quality?

                                This is just out of interest, as I assume that 10.5 or 11 bar would not make much difference on the Vostok and the additional cost and effort probably wouldn’t be worth it.

                                I’d love to see the GIF however 😅

                                    Tiramigiu I’d love to see the GIF however 😅

                                    Nah, I’d like to just for vicarious enjoyment but I would simply be indulging myself.

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                                      DavecUK yes you did but from memory it was automatically activated as opposed to manually activated via the recessed button so maybe the latter is what Jake is after.

                                        hi,

                                        i want someone to grind a med dark bean on 4 on a niche, pull the lever, choke the machine, lift the lever then press the button , :)

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                                        7 days later

                                        Today, I had asked Maria of ACS re-Vostok’s price. It’s very attractively / competitively priced, tbh.

                                        Concerning the Vostok single group:

                                        We have scheduled the production of the Vostok single group by the beginning of March and we are accepting pre-orders.

                                        For the technical features and pictures follow the link below:



                                        The new Vostok single group is equipped, besides of the main control panel, with an innovative dosing system, to control the group with additional unique features.

                                        On the main display, not considering the standard functions, you can set the preinfusion pressure that will be controlled electronically.

                                        On the additional board you can work in 2 ways: by time or pressure. When the time mode is selected you can set 2 different duration of total infusion, when the pressure mode is selected you can set 2 different pressure to end the shot. In both cases during the shot when the values are reached the water in excess will be discharged, as well as the residual pressure in the group. The preferred way is by pressure because at a certain pressure a precise quantity of water will flow out.

                                        We have checked that independently from the grinding or qty of coffee at a certain pressure the volume of the coffee it’s always the same. Of course there is always the possibility to stop the brewing manually, there are 3 buttons to program the board in an easy way and this display will be positioned on the left side between the group and steam or water tap.
                                        Also, there are 2 timer on the display, the top is the preinfusion and the bottom the infusion. In the setting you can set and then visualize the pressure set or the time set.

                                        Actually this functions are unique on the lever machines scenario and we hope that our customers will appreciate.

                                        Find following our final price for the standard stainless steel Vostok single group with walnut handles and knobs:
                                        €3.500,00 including shipping

                                        Options Price lists:

                                        Full colour €140,00
                                        Colouring 3 panels (sides and rear) €98,00
                                        LSM €150,00

                                        The picture is for the handle option

                                        We are offering a special price for the full sets options:
                                        Side oak/walnut/rosewood/olive panels + oak/walnut/rosewood/olive handles and knobs €300,00

                                        Side oak/walnut/rosewood/olive panels + oak/walnut/rosewood/olive +metal handles and knobs €350,00

                                        Side oak/walnut/rosewood/olive panels + oak/walnut/rosewood/olive handles and knobs +3 panels colouring €350,00

                                        Side oak/walnut/rosewood/olive panels + oak/walnut/rosewood/olive handles and knobs +full body colouring €375,00

                                        Side oak/walnut/rosewood/olive panels + oak/walnut/rosewood/olive +metal handles and knobs + 3 panels colouring €375,00

                                        Side oak/walnut/rosewood/olive panels + oak/ walnut/rosewood/olive+metal handles and knobs + full body colouring €400,00

                                        Also, you can decide for a sole wood kit as in the link below:

                                        https://drive.google.com/drive/folders/1RDni48vGyM5ePIZBFcHM8jZNhTE1644q?usp=sharing

                                        -Combined wood ( oak/olive/rosewood + aluminium ) €294,00

                                        -Full Olive / Oak/ Rosewood kit €210,00

                                        Hope it helps those who may be interested!

                                        I now have to get in touch with Maria and decide on timber.
                                        They only had oak initially and that handle is very tempting.

                                        That’s a picture of an EVO by the way.🤔😀

                                          Placed my pre-order last week, hope the production schedule stays on track. Cant say I’ve ever received a 50 kilo box from Italy.