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Thread: Another OPV thread (ecm botticelli based)

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    Another OPV thread (ecm botticelli based)

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Gday good people

    OK so I have been reading the stuff on here about the over pressure valves and that some are adjustable and that 9 bar is sort of like our magic figure for pump pressure etc. as my Botticelli is 2nd hand and I have no instruction manual I thought Id look into mine to see where I was at. I read some stuff and found a post by Brett (telemaster) who also has a Botticelli that said this -

    Hi Jim, check which of the vibrating pumps you have- probably the ulka. I have the ulka EK and in my botticelli (big silvia really) it was a matter of measuring flow from OPV in 30 sec (from when water flowed)with blind filter in- 8 bars was 150ml 10 bars was 100ml. You can do a google search based on your pump and youll find coffeesnobs threads with your model
    Brett


    2 questions
    1.As I didnt get the instruction manual with the machine could someone let me know how/if I am able to adjust my OPV.

    2.I ran the test above with a blind filter to see how many mls in 30 seconds - I ended up with 175mls in 30secs. To my still learning coffee brain this means I am sitting on about 7 bars of pump pressure.

    This seems to be unusual for most machines as most people talk of reducing their pressure. Also I have read here that increasing pressure is not usually recommended.

    OK ideas on possible diagnosis with what is going on? Is there things I can/should do myself or is this the sort of thing that I need to take to a professional for testing/check up/overhaul?

    Thanks all

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    Re: Another OPV thread (ecm botticelli based)

    Quote Originally Posted by Shannon link=1224832436/0#0 date=1224832436
    ....OK ideas on possible diagnosis with what is going on? Is there things I can/should do myself or is this the sort of thing that I need to take to a professional for testing/check up/overhaul?

    Thanks all
    Hi Shannon,

    You can use the method you have suggested. Far better though is to find someone (probably a techie) with a portafilter pressure gauge and have it tested and adjusted if required....

    regards

    Chris

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    Re: Another OPV thread (ecm botticelli based)

    Quote Originally Posted by Shannon link=1224832436/0#0 date=1224832436
    I ended up with 175mls in 30secs. To my still learning coffee brain this means I am sitting on about 7 bars of pump pressure.
    I dont have the Pump Performance Chart in front of me Shannon, but if it indicates an equivalent line pressure of 7 Bar or so, this is probably a little low "on paper" but theres no way to know for sure unless you can borrow a PF with Pressure Gauge or take your Bott into an espresso techs premises and have them check it for you.

    With the degree of error thats possible using the Pump Pressure/Flow Chart, Id leave it alone for now. More than likely it is very close to the 8.5-9.0 Bar "ideal" as it should be. No need to tinker around with the Bott if you are happy with the quality of the pours she is producing mate. Just enjoy the coffee.... :)

    Mal.

    Snap Chris ;D

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    Re: Another OPV thread (ecm botticelli based)

    Thanks for quick response Chris

    Will look into whether my local roaster carries one.

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    Re: Another OPV thread (ecm botticelli based)

    Thanks Mal

    It seems you guys were typing simultaneously :) I agree dont fix it if it aint broke.
    I am lothe to blame the machine over the user with anything coffee related, but want to make sure all is running smoothly at a machine level so that the only variable is me. I wont go out of my way though.
    I am thinking that the more I get into it the fussier I am about good coffee so am going through a bit of a frustrating stage at the moment where I am hit and miss.
    When I can afford it I will be attending a home barista course and if I can make it to dennis do it will be good to see others making this black gold and learn a bit more

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    Re: Another OPV thread (ecm botticelli based)

    Gday Shannon,

    Yeah, Chris is a bit quicker on the "keys" than I am.... ;D

    To be quite honest though mate, I would be very surprised if your Bott is operating very far away from the ideal specs for brew water pressure and temperature. It doesnt hurt to check of course if its for no other reason than "peace of mind".

    If youre having some troubles with consistency at the moment, maybe you just need to go right back to basics and take things one careful step at a time. Grab yourself a pack of Andys "Wow" (this will iron out any issues with roast quality and bean freshness) and then start off with a slightly coarse grind and slowly dial the Bott in. If you think there may be issues with dosing, distribution and tamping that could be contributing to your current woes, just deal with one thing at a time until youre sure that each step is being performed properly and consistently. If your pours are still very erratic in quality, then you may indeed have something in the Bott that needs checking out but I would concentrate on the "Home Barista" side of things first as this is where 98% of variables will lie.

    All the best mate and hope its all sorted soon, :)

    Cheerio,
    Mal.

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    Re: Another OPV thread (ecm botticelli based)

    Thanks Mal - I agree that it is far more likely the poor sap on the other end of the machine that is at fault as opposed to the machine

    I am giving the basics a try and dialling in again etc. I am lucky enough to be about 2kms away from the Morgans roastery so I know it isnt the beans.
    I feel it is coming down to dose and tamp technique. I can dial the rocky so that I get a good pour rate, but it blonds early. I know that the 30 in 25-30 is guide only but what I am getting is 30 in 20 to 25, but blonding usually occurs after 15 or 17. When just drinking I will stop the shot early rather than get my volume up.

    Step rocky back a bit (coarser) and it gets a little better but the overall colour is a lot lighter from the start, go a bit finer and the timing is better and the colour is heaps better but it is a really restricted shot.

    This was so much easier when I was oblivious to how good coffee can get ;) ;D

    I still have a tamper that is not a great fit (a generic that came with the machine) but still it is only about 3mm out. I am really hoping that my wife will let me grab a site sponsors offerings for christmas if funds will allow so that my tamping might get a little more consistant.
    I am also going to look at borrowing a naked PF to see if like I suspect I am getting some serious channelling.

    And so the quest continues...........

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    Re: Another OPV thread (ecm botticelli based)

    Hi Shannon

    You may have struck the puck on the head with your questioning the quality of the tamper. 3mm is a pretty big gap to have between the tamper and the side of the basket, and to compensate, Id guess you would need, or are using a NSEW method.

    As for the serious channeling, I would think if this is the case it would be noticeable once you remove the group handle ie. a small linear opening betwen the puck and the basket.

    If you can make it to the roastery on the 8th, bring along your machine and tamper, and we should be able to work out whats going on.

    cheers!

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    Re: Another OPV thread (ecm botticelli based)

    Hi again Shannon

    Came across the attached pdf file that may be of some use as a reference. Please be aware that it refers to machines for USA (120v).





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    Re: Another OPV thread (ecm botticelli based)

    Thanks for the info Dennis

    I am doing the NSEW method but yes there are times where the telltale signs of channelling are there after a shot.

    I am hoping to make it on the 8th, but Allison is working so depends on how the kids are going on the day.

    I have just had clearance to be able to buy a tamper as a chrissy present - but I I didnt actually tell her the price and Im sure she is thinking a lot less then I am going to pay!!

    Thanks again.
    Shannon.

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    Re: Another OPV thread (ecm botticelli based)

    If you cant make it on the 8th, would be happy to help at some other time Shannon. *We also carry stock of Rattleware tampers that are Allison friendly and do a great job. :)

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    Re: Another OPV thread (ecm botticelli based)

    Behmor Brazen - $249 - Free Freight
    Quote Originally Posted by cuppacoffee link=1224832436/0#7 date=1225073924
    You may have struck the puck on the head with your questioning the quality of the tamper. 3mm is a pretty big gap to have between the tamper and the side of the basket
    Good one Dennis.... ;D

    Good advice too of course,

    Mal.



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