coffee-forum.net
Promoting coffee discussion.

Main
Date: 12 Dec 2006 08:10:21
From:
Subject: Vibiemme pressure drop - is that ok?
Hi everybody,
I've recently purchased Vibiemme Domobar (single boiler) - it's a
definite move forward but I have a problem - or is it simply my
ignorance?
Problem is that when I raise the lever to the top position it loses all
the pressure and it doesn't make sense to me - it drips and makes a
semi-decent coffee (which could also be due to my grinder), but I'm
wondering if it's just a lousy coffee comparing to how it should be.
And in details, first, when I go to the middle position it starts the
pump, that's obvious, it's like when pressing the red button for
the water - the pressure is ok, it shoots up to almost 12 bars (maybe
too much, and too fast?) and pump is clearly working and sounding
properly, I think. Then, as I continue and move it further up - it
instantly drops the pressure to something like 2 bars!? Then it starts
dripping after 4-6 secs, which seems ok more or less, but the entire
time the pressure is below 6 bars at most - starts w/ 2 (as the lever
arrives at the top) and then slowly increases to 3,4 and maybe 6, but
nowhere near 9 or so.
It behaves similarly when I pull some water on the left - so its
either a bug or a feature?
If anyone could explain it to me I'd be eternally grateful - any
experiences?
Thanks in advance,
Dragan

P.S. And in that sense, what about the pre-brewing? Is it possible at
all or not, middle-position doesn't seem to do anything.





 
Date: 13 Dec 2006 14:00:21
From:
Subject: Re: Vibiemme pressure drop - is that ok?
...and to finish this thread - for any newcomers that might have
similar question in the future...
...I've returned and got new machine today, it was a real issue,
something probably w/ OPV valve as suggested (thumbs up to Ian:), now
it works as you suggested, 4-6 bars very fast then shoots up depending
on the coffee used, temping etc., so it's ok now.
But for anybody, experiencing similar issues - the pressure does
matter! And manometer (pressure sensor / gauge) readings are important,
it's there to show you how to make a good espresso, it starts low but
should go up properly up to 8-9 or more depnding on your coffee, OPV
tweaking etc. And if your pressure is too low, for any reason, the
coffee is just too bitter, my shots (previously) took 45 secs (2.5 oz)
to extract - it was terribly strong, awful, I realize that now. By the
way, if the machine is ok, you should get good espresso almost
instantly, it requires some time to experiment w/ the coffee, grinder,
temping etc. (hopefully I'll master in it in a few months:) but the
machine produces excellent shots out-of-the-box, just use any freshly
ground coffee and you should see that nice crema, oily and sirupy! When
you get a new machine, you know nothing, and it's hard to tell what's
the 'expected behavior' - but it should be ok and real espresso, even
if it's a first shot you pulled out,
Thanks to alt.coffee for all the help!


ns.gaga@gmail.com wrote:
> stefano65 wrote:
> > So is this a brand new Vibiemme domobar super or\a single stage boiler
> > domobar?
>
> ...it's a single boiler one (non-HE)...
>
>
> I->Ian wrote:
> > Sounds like a repair / warranty issue. Possibly a leaking OPV. You can
> > check that by looking at the return line to the tank. It's the one
> > without the filter on the end.
>
> ...looks like repair / warranty issue to me to...
> ...thanks Ian! btw. what should the return line (into the tank) show
> then? I guess no water going back, right?
>
> Thanks,
> Dragan



 
Date: 13 Dec 2006 02:55:08
From:
Subject: Re: Vibiemme pressure drop - is that ok?
stefano65 wrote:
> So is this a brand new Vibiemme domobar super or\a single stage boiler
> domobar?

...it's a single boiler one (non-HE)...


I- >Ian wrote:
> Sounds like a repair / warranty issue. Possibly a leaking OPV. You can
> check that by looking at the return line to the tank. It's the one
> without the filter on the end.

...looks like repair / warranty issue to me to...
...thanks Ian! btw. what should the return line (into the tank) show
then? I guess no water going back, right?

Thanks,
Dragan



 
Date: 12 Dec 2006 15:54:54
From: stefano65
Subject: Re: Vibiemme pressure drop - is that ok?

So is this a brand new Vibiemme domobar super or\a single stage boiler
domobar?



 
Date: 12 Dec 2006 14:12:02
From:
Subject: Re: Vibiemme pressure drop - is that ok?
...it just stays around 2 bars no matter what I do - if I take a long
shot for ~30 sec or so it goes up to near 4bar, but nothing more. Just
doesn't seem ok to me, people are regularly measuring the pressure to
adjust the coffee etc. and why would I need manometer for other then
for when dripping the coffee?
Any other thoughts? Anybody?
Thanks!

ns.gaga@gmail.com wrote:
> ...no blind basket, I could simulate but not sure, as I don't think it
> has that 3-way solenoid or whatever it is named, and if it's intended
> for backflushing - so I'm reluctant to try anything like that. But just
> 'mentally', it should work ok, as it builds enough pressure 'when
> closed' (just guessing of course:), it's only when the valve opens,
> either way...
> It could be the coffee though, but I've tried quite a few, pre-ground
> etc., and all w/ similar results I believe. But I'll try to experiment
> w/ more coffee, double and fine, to fill up the basket.
> Thanks
>
> I->Ian wrote:
> > If you have a blind basket, pull a shot starting from 0
> >
> > Should go to about ~2-4bar for a few seconds then climb to OPV
> > pressure ~10+ bar.
> >
> > If it doesn't then there is a problem.
> >
> > If it does, then sounds like the grind is too coarse / not enough
> > coffee
> >
> > On 12 Dec 2006 11:09:03 -0800, ns.gaga@gmail.com wrote:
> >
> > >...thanks on the reply! Some more though...
> > >
> > >> on an e61 there are two lever positions full down and full up.
> > >>
> > >...effectively seems so, but the micro-switch fires in the middle
> > >already and stays on for the upper one as well - middle fires the pump,
> > >the same as the left-side red for water (like to prepare the pressure)
> > >- the upper one frees the water (valve, not the switch). Also, I've
> > >read a full-blown E61 review
> > >(http://www.wholelattelove.com/articles/e61_brew_group.cfm) and under
> > >"Leveraging Your Brewing Process" states something quite different from
> > >our experience, but makes more sense (maybe it goes for the commercial
> > >implementations - I tried that but it's not the case on my machine).
> > >Anyway, I guess what you're saying is how it is at the end of the day,
> > >but I'd like to understand the internals of it, the more you know it,
> > >the better coffee should be, and I'm still missing some bits and pieces
> > >here, and I've seen more then a few quite opposed opinions on it,
> > >pre-brewing etc., so just adding to the confusion.
> > >
> > >> It's normal on an e61 for the pressure to rise to about 4bar and then
> > >> climb to [whatever is higher of OPV or puck resistance] after about
> > >> 6-8 seconds.
> > >>
> > >> If you flush your shower screen after the shot, the pressure will drop
> > >> to nearly 0.
> > >>
> > >> On the next shot ~4bar for ~6sec climbing to MAX for shot duration
> > >
> > >...so what you're saying is that it is all ok w/ my machine? (other
> > >then the pressure problem all else seems more or less normal, except
> > >that I'm still unable to get near-perfect shots). In my case it's more
> > >2 bars then 4, and it never shoots over 6 - and it's just too low all
> > >along. And what I want to know really I guess is whether these readings
> > >during extraction/dripping make any sense at all, should I care - or is
> > >it just the manometer that is not at its best? I thought the pressure
> > >(besides temperature) is what matters the most, should be ~9bars, or
> > >more, or a bit less - but not much less, isn't that right?
> > >
> > >Thanks a lot,
> > >Dragan
> > >
> > >
> > >
> > >I->Ian wrote:
> > >> On 12 Dec 2006 08:10:21 -0800, ns.gaga@gmail.com wrote:
> > >>
> > >> >Hi everybody,
> > >> >I've recently purchased Vibiemme Domobar (single boiler) - it's a
> > >> >definite move forward but I have a problem - or is it simply my
> > >> >ignorance?
> > >> >Problem is that when I raise the lever to the top position it loses all
> > >> >the pressure and it doesn't make sense to me - it drips and makes a
> > >> >semi-decent coffee (which could also be due to my grinder), but I'm
> > >> >wondering if it's just a lousy coffee comparing to how it should be.
> > >> >And in details, first, when I go to the middle position it starts the
> > >> >pump, that's obvious, it's like when pressing the red button for
> > >> >the water - the pressure is ok, it shoots up to almost 12 bars (maybe
> > >> >too much, and too fast?) and pump is clearly working and sounding
> > >> >properly, I think. Then, as I continue and move it further up - it
> > >> >instantly drops the pressure to something like 2 bars!? Then it starts
> > >> >dripping after 4-6 secs, which seems ok more or less, but the entire
> > >> >time the pressure is below 6 bars at most - starts w/ 2 (as the lever
> > >> >arrives at the top) and then slowly increases to 3,4 and maybe 6, but
> > >> >nowhere near 9 or so.
> > >> >It behaves similarly when I pull some water on the left - so its
> > >> >either a bug or a feature?
> > >> >If anyone could explain it to me I'd be eternally grateful - any
> > >> >experiences?
> > >> >Thanks in advance,
> > >> >Dragan
> > >> >
> > >> >P.S. And in that sense, what about the pre-brewing? Is it possible at
> > >> >all or not, middle-position doesn't seem to do anything.
> > >>
> > >> on an e61 there are two lever positions full down and full up.
> > >>
> > >> It's normal on an e61 for the pressure to rise to about 4bar and then
> > >> climb to [whatever is higher of OPV or puck resistance] after about
> > >> 6-8 seconds.
> > >>
> > >> If you flush your shower screen after the shot, the pressure will drop
> > >> to nearly 0.
> > >>
> > >> On the next shot ~4bar for ~6sec climbing to MAX for shot duration



  
Date: 12 Dec 2006 22:17:14
From: I->Ian
Subject: Re: Vibiemme pressure drop - is that ok?

Sounds like a repair / warranty issue. Possibly a leaking OPV. You can
check that by looking at the return line to the tank. It's the one
without the filter on the end.

On 12 Dec 2006 14:12:02 -0800, ns.gaga@gmail.com wrote:

>...it just stays around 2 bars no matter what I do - if I take a long
>shot for ~30 sec or so it goes up to near 4bar, but nothing more. Just
>doesn't seem ok to me, people are regularly measuring the pressure to
>adjust the coffee etc. and why would I need manometer for other then
>for when dripping the coffee?
>Any other thoughts? Anybody?
>Thanks!
>
>ns.gaga@gmail.com wrote:
>> ...no blind basket, I could simulate but not sure, as I don't think it
>> has that 3-way solenoid or whatever it is named, and if it's intended
>> for backflushing - so I'm reluctant to try anything like that. But just
>> 'mentally', it should work ok, as it builds enough pressure 'when
>> closed' (just guessing of course:), it's only when the valve opens,
>> either way...
>> It could be the coffee though, but I've tried quite a few, pre-ground
>> etc., and all w/ similar results I believe. But I'll try to experiment
>> w/ more coffee, double and fine, to fill up the basket.
>> Thanks
>>
>> I->Ian wrote:
>> > If you have a blind basket, pull a shot starting from 0
>> >
>> > Should go to about ~2-4bar for a few seconds then climb to OPV
>> > pressure ~10+ bar.
>> >
>> > If it doesn't then there is a problem.
>> >
>> > If it does, then sounds like the grind is too coarse / not enough
>> > coffee
>> >
>> > On 12 Dec 2006 11:09:03 -0800, ns.gaga@gmail.com wrote:
>> >
>> > >...thanks on the reply! Some more though...
>> > >
>> > >> on an e61 there are two lever positions full down and full up.
>> > >>
>> > >...effectively seems so, but the micro-switch fires in the middle
>> > >already and stays on for the upper one as well - middle fires the pump,
>> > >the same as the left-side red for water (like to prepare the pressure)
>> > >- the upper one frees the water (valve, not the switch). Also, I've
>> > >read a full-blown E61 review
>> > >(http://www.wholelattelove.com/articles/e61_brew_group.cfm) and under
>> > >"Leveraging Your Brewing Process" states something quite different from
>> > >our experience, but makes more sense (maybe it goes for the commercial
>> > >implementations - I tried that but it's not the case on my machine).
>> > >Anyway, I guess what you're saying is how it is at the end of the day,
>> > >but I'd like to understand the internals of it, the more you know it,
>> > >the better coffee should be, and I'm still missing some bits and pieces
>> > >here, and I've seen more then a few quite opposed opinions on it,
>> > >pre-brewing etc., so just adding to the confusion.
>> > >
>> > >> It's normal on an e61 for the pressure to rise to about 4bar and then
>> > >> climb to [whatever is higher of OPV or puck resistance] after about
>> > >> 6-8 seconds.
>> > >>
>> > >> If you flush your shower screen after the shot, the pressure will drop
>> > >> to nearly 0.
>> > >>
>> > >> On the next shot ~4bar for ~6sec climbing to MAX for shot duration
>> > >
>> > >...so what you're saying is that it is all ok w/ my machine? (other
>> > >then the pressure problem all else seems more or less normal, except
>> > >that I'm still unable to get near-perfect shots). In my case it's more
>> > >2 bars then 4, and it never shoots over 6 - and it's just too low all
>> > >along. And what I want to know really I guess is whether these readings
>> > >during extraction/dripping make any sense at all, should I care - or is
>> > >it just the manometer that is not at its best? I thought the pressure
>> > >(besides temperature) is what matters the most, should be ~9bars, or
>> > >more, or a bit less - but not much less, isn't that right?
>> > >
>> > >Thanks a lot,
>> > >Dragan
>> > >
>> > >
>> > >
>> > >I->Ian wrote:
>> > >> On 12 Dec 2006 08:10:21 -0800, ns.gaga@gmail.com wrote:
>> > >>
>> > >> >Hi everybody,
>> > >> >I've recently purchased Vibiemme Domobar (single boiler) - it's a
>> > >> >definite move forward but I have a problem - or is it simply my
>> > >> >ignorance?
>> > >> >Problem is that when I raise the lever to the top position it loses all
>> > >> >the pressure and it doesn't make sense to me - it drips and makes a
>> > >> >semi-decent coffee (which could also be due to my grinder), but I'm
>> > >> >wondering if it's just a lousy coffee comparing to how it should be.
>> > >> >And in details, first, when I go to the middle position it starts the
>> > >> >pump, that's obvious, it's like when pressing the red button for
>> > >> >the water - the pressure is ok, it shoots up to almost 12 bars (maybe
>> > >> >too much, and too fast?) and pump is clearly working and sounding
>> > >> >properly, I think. Then, as I continue and move it further up - it
>> > >> >instantly drops the pressure to something like 2 bars!? Then it starts
>> > >> >dripping after 4-6 secs, which seems ok more or less, but the entire
>> > >> >time the pressure is below 6 bars at most - starts w/ 2 (as the lever
>> > >> >arrives at the top) and then slowly increases to 3,4 and maybe 6, but
>> > >> >nowhere near 9 or so.
>> > >> >It behaves similarly when I pull some water on the left - so its
>> > >> >either a bug or a feature?
>> > >> >If anyone could explain it to me I'd be eternally grateful - any
>> > >> >experiences?
>> > >> >Thanks in advance,
>> > >> >Dragan
>> > >> >
>> > >> >P.S. And in that sense, what about the pre-brewing? Is it possible at
>> > >> >all or not, middle-position doesn't seem to do anything.
>> > >>
>> > >> on an e61 there are two lever positions full down and full up.
>> > >>
>> > >> It's normal on an e61 for the pressure to rise to about 4bar and then
>> > >> climb to [whatever is higher of OPV or puck resistance] after about
>> > >> 6-8 seconds.
>> > >>
>> > >> If you flush your shower screen after the shot, the pressure will drop
>> > >> to nearly 0.
>> > >>
>> > >> On the next shot ~4bar for ~6sec climbing to MAX for shot duration


 
Date: 12 Dec 2006 11:41:11
From:
Subject: Re: Vibiemme pressure drop - is that ok?
...no blind basket, I could simulate but not sure, as I don't think it
has that 3-way solenoid or whatever it is named, and if it's intended
for backflushing - so I'm reluctant to try anything like that. But just
'mentally', it should work ok, as it builds enough pressure 'when
closed' (just guessing of course:), it's only when the valve opens,
either way...
It could be the coffee though, but I've tried quite a few, pre-ground
etc., and all w/ similar results I believe. But I'll try to experiment
w/ more coffee, double and fine, to fill up the basket.
Thanks

I- >Ian wrote:
> If you have a blind basket, pull a shot starting from 0
>
> Should go to about ~2-4bar for a few seconds then climb to OPV
> pressure ~10+ bar.
>
> If it doesn't then there is a problem.
>
> If it does, then sounds like the grind is too coarse / not enough
> coffee
>
> On 12 Dec 2006 11:09:03 -0800, ns.gaga@gmail.com wrote:
>
> >...thanks on the reply! Some more though...
> >
> >> on an e61 there are two lever positions full down and full up.
> >>
> >...effectively seems so, but the micro-switch fires in the middle
> >already and stays on for the upper one as well - middle fires the pump,
> >the same as the left-side red for water (like to prepare the pressure)
> >- the upper one frees the water (valve, not the switch). Also, I've
> >read a full-blown E61 review
> >(http://www.wholelattelove.com/articles/e61_brew_group.cfm) and under
> >"Leveraging Your Brewing Process" states something quite different from
> >our experience, but makes more sense (maybe it goes for the commercial
> >implementations - I tried that but it's not the case on my machine).
> >Anyway, I guess what you're saying is how it is at the end of the day,
> >but I'd like to understand the internals of it, the more you know it,
> >the better coffee should be, and I'm still missing some bits and pieces
> >here, and I've seen more then a few quite opposed opinions on it,
> >pre-brewing etc., so just adding to the confusion.
> >
> >> It's normal on an e61 for the pressure to rise to about 4bar and then
> >> climb to [whatever is higher of OPV or puck resistance] after about
> >> 6-8 seconds.
> >>
> >> If you flush your shower screen after the shot, the pressure will drop
> >> to nearly 0.
> >>
> >> On the next shot ~4bar for ~6sec climbing to MAX for shot duration
> >
> >...so what you're saying is that it is all ok w/ my machine? (other
> >then the pressure problem all else seems more or less normal, except
> >that I'm still unable to get near-perfect shots). In my case it's more
> >2 bars then 4, and it never shoots over 6 - and it's just too low all
> >along. And what I want to know really I guess is whether these readings
> >during extraction/dripping make any sense at all, should I care - or is
> >it just the manometer that is not at its best? I thought the pressure
> >(besides temperature) is what matters the most, should be ~9bars, or
> >more, or a bit less - but not much less, isn't that right?
> >
> >Thanks a lot,
> >Dragan
> >
> >
> >
> >I->Ian wrote:
> >> On 12 Dec 2006 08:10:21 -0800, ns.gaga@gmail.com wrote:
> >>
> >> >Hi everybody,
> >> >I've recently purchased Vibiemme Domobar (single boiler) - it's a
> >> >definite move forward but I have a problem - or is it simply my
> >> >ignorance?
> >> >Problem is that when I raise the lever to the top position it loses all
> >> >the pressure and it doesn't make sense to me - it drips and makes a
> >> >semi-decent coffee (which could also be due to my grinder), but I'm
> >> >wondering if it's just a lousy coffee comparing to how it should be.
> >> >And in details, first, when I go to the middle position it starts the
> >> >pump, that's obvious, it's like when pressing the red button for
> >> >the water - the pressure is ok, it shoots up to almost 12 bars (maybe
> >> >too much, and too fast?) and pump is clearly working and sounding
> >> >properly, I think. Then, as I continue and move it further up - it
> >> >instantly drops the pressure to something like 2 bars!? Then it starts
> >> >dripping after 4-6 secs, which seems ok more or less, but the entire
> >> >time the pressure is below 6 bars at most - starts w/ 2 (as the lever
> >> >arrives at the top) and then slowly increases to 3,4 and maybe 6, but
> >> >nowhere near 9 or so.
> >> >It behaves similarly when I pull some water on the left - so its
> >> >either a bug or a feature?
> >> >If anyone could explain it to me I'd be eternally grateful - any
> >> >experiences?
> >> >Thanks in advance,
> >> >Dragan
> >> >
> >> >P.S. And in that sense, what about the pre-brewing? Is it possible at
> >> >all or not, middle-position doesn't seem to do anything.
> >>
> >> on an e61 there are two lever positions full down and full up.
> >>
> >> It's normal on an e61 for the pressure to rise to about 4bar and then
> >> climb to [whatever is higher of OPV or puck resistance] after about
> >> 6-8 seconds.
> >>
> >> If you flush your shower screen after the shot, the pressure will drop
> >> to nearly 0.
> >>
> >> On the next shot ~4bar for ~6sec climbing to MAX for shot duration



 
Date: 12 Dec 2006 11:09:03
From:
Subject: Re: Vibiemme pressure drop - is that ok?
...thanks on the reply! Some more though...

> on an e61 there are two lever positions full down and full up.
>
...effectively seems so, but the micro-switch fires in the middle
already and stays on for the upper one as well - middle fires the pump,
the same as the left-side red for water (like to prepare the pressure)
- the upper one frees the water (valve, not the switch). Also, I've
read a full-blown E61 review
(http://www.wholelattelove.com/articles/e61_brew_group.cfm) and under
"Leveraging Your Brewing Process" states something quite different from
our experience, but makes more sense (maybe it goes for the commercial
implementations - I tried that but it's not the case on my machine).
Anyway, I guess what you're saying is how it is at the end of the day,
but I'd like to understand the internals of it, the more you know it,
the better coffee should be, and I'm still missing some bits and pieces
here, and I've seen more then a few quite opposed opinions on it,
pre-brewing etc., so just adding to the confusion.

> It's normal on an e61 for the pressure to rise to about 4bar and then
> climb to [whatever is higher of OPV or puck resistance] after about
> 6-8 seconds.
>
> If you flush your shower screen after the shot, the pressure will drop
> to nearly 0.
>
> On the next shot ~4bar for ~6sec climbing to MAX for shot duration

...so what you're saying is that it is all ok w/ my machine? (other
then the pressure problem all else seems more or less normal, except
that I'm still unable to get near-perfect shots). In my case it's more
2 bars then 4, and it never shoots over 6 - and it's just too low all
along. And what I want to know really I guess is whether these readings
during extraction/dripping make any sense at all, should I care - or is
it just the manometer that is not at its best? I thought the pressure
(besides temperature) is what matters the most, should be ~9bars, or
more, or a bit less - but not much less, isn't that right?

Thanks a lot,
Dragan



I- >Ian wrote:
> On 12 Dec 2006 08:10:21 -0800, ns.gaga@gmail.com wrote:
>
> >Hi everybody,
> >I've recently purchased Vibiemme Domobar (single boiler) - it's a
> >definite move forward but I have a problem - or is it simply my
> >ignorance?
> >Problem is that when I raise the lever to the top position it loses all
> >the pressure and it doesn't make sense to me - it drips and makes a
> >semi-decent coffee (which could also be due to my grinder), but I'm
> >wondering if it's just a lousy coffee comparing to how it should be.
> >And in details, first, when I go to the middle position it starts the
> >pump, that's obvious, it's like when pressing the red button for
> >the water - the pressure is ok, it shoots up to almost 12 bars (maybe
> >too much, and too fast?) and pump is clearly working and sounding
> >properly, I think. Then, as I continue and move it further up - it
> >instantly drops the pressure to something like 2 bars!? Then it starts
> >dripping after 4-6 secs, which seems ok more or less, but the entire
> >time the pressure is below 6 bars at most - starts w/ 2 (as the lever
> >arrives at the top) and then slowly increases to 3,4 and maybe 6, but
> >nowhere near 9 or so.
> >It behaves similarly when I pull some water on the left - so its
> >either a bug or a feature?
> >If anyone could explain it to me I'd be eternally grateful - any
> >experiences?
> >Thanks in advance,
> >Dragan
> >
> >P.S. And in that sense, what about the pre-brewing? Is it possible at
> >all or not, middle-position doesn't seem to do anything.
>
> on an e61 there are two lever positions full down and full up.
>
> It's normal on an e61 for the pressure to rise to about 4bar and then
> climb to [whatever is higher of OPV or puck resistance] after about
> 6-8 seconds.
>
> If you flush your shower screen after the shot, the pressure will drop
> to nearly 0.
>
> On the next shot ~4bar for ~6sec climbing to MAX for shot duration



  
Date: 12 Dec 2006 19:21:22
From: I->Ian
Subject: Re: Vibiemme pressure drop - is that ok?
If you have a blind basket, pull a shot starting from 0

Should go to about ~2-4bar for a few seconds then climb to OPV
pressure ~10+ bar.

If it doesn't then there is a problem.

If it does, then sounds like the grind is too coarse / not enough
coffee

On 12 Dec 2006 11:09:03 -0800, ns.gaga@gmail.com wrote:

>...thanks on the reply! Some more though...
>
>> on an e61 there are two lever positions full down and full up.
>>
>...effectively seems so, but the micro-switch fires in the middle
>already and stays on for the upper one as well - middle fires the pump,
>the same as the left-side red for water (like to prepare the pressure)
>- the upper one frees the water (valve, not the switch). Also, I've
>read a full-blown E61 review
>(http://www.wholelattelove.com/articles/e61_brew_group.cfm) and under
>"Leveraging Your Brewing Process" states something quite different from
>our experience, but makes more sense (maybe it goes for the commercial
>implementations - I tried that but it's not the case on my machine).
>Anyway, I guess what you're saying is how it is at the end of the day,
>but I'd like to understand the internals of it, the more you know it,
>the better coffee should be, and I'm still missing some bits and pieces
>here, and I've seen more then a few quite opposed opinions on it,
>pre-brewing etc., so just adding to the confusion.
>
>> It's normal on an e61 for the pressure to rise to about 4bar and then
>> climb to [whatever is higher of OPV or puck resistance] after about
>> 6-8 seconds.
>>
>> If you flush your shower screen after the shot, the pressure will drop
>> to nearly 0.
>>
>> On the next shot ~4bar for ~6sec climbing to MAX for shot duration
>
>...so what you're saying is that it is all ok w/ my machine? (other
>then the pressure problem all else seems more or less normal, except
>that I'm still unable to get near-perfect shots). In my case it's more
>2 bars then 4, and it never shoots over 6 - and it's just too low all
>along. And what I want to know really I guess is whether these readings
>during extraction/dripping make any sense at all, should I care - or is
>it just the manometer that is not at its best? I thought the pressure
>(besides temperature) is what matters the most, should be ~9bars, or
>more, or a bit less - but not much less, isn't that right?
>
>Thanks a lot,
>Dragan
>
>
>
>I->Ian wrote:
>> On 12 Dec 2006 08:10:21 -0800, ns.gaga@gmail.com wrote:
>>
>> >Hi everybody,
>> >I've recently purchased Vibiemme Domobar (single boiler) - it's a
>> >definite move forward but I have a problem - or is it simply my
>> >ignorance?
>> >Problem is that when I raise the lever to the top position it loses all
>> >the pressure and it doesn't make sense to me - it drips and makes a
>> >semi-decent coffee (which could also be due to my grinder), but I'm
>> >wondering if it's just a lousy coffee comparing to how it should be.
>> >And in details, first, when I go to the middle position it starts the
>> >pump, that's obvious, it's like when pressing the red button for
>> >the water - the pressure is ok, it shoots up to almost 12 bars (maybe
>> >too much, and too fast?) and pump is clearly working and sounding
>> >properly, I think. Then, as I continue and move it further up - it
>> >instantly drops the pressure to something like 2 bars!? Then it starts
>> >dripping after 4-6 secs, which seems ok more or less, but the entire
>> >time the pressure is below 6 bars at most - starts w/ 2 (as the lever
>> >arrives at the top) and then slowly increases to 3,4 and maybe 6, but
>> >nowhere near 9 or so.
>> >It behaves similarly when I pull some water on the left - so its
>> >either a bug or a feature?
>> >If anyone could explain it to me I'd be eternally grateful - any
>> >experiences?
>> >Thanks in advance,
>> >Dragan
>> >
>> >P.S. And in that sense, what about the pre-brewing? Is it possible at
>> >all or not, middle-position doesn't seem to do anything.
>>
>> on an e61 there are two lever positions full down and full up.
>>
>> It's normal on an e61 for the pressure to rise to about 4bar and then
>> climb to [whatever is higher of OPV or puck resistance] after about
>> 6-8 seconds.
>>
>> If you flush your shower screen after the shot, the pressure will drop
>> to nearly 0.
>>
>> On the next shot ~4bar for ~6sec climbing to MAX for shot duration


 
Date: 12 Dec 2006 18:27:23
From: I->Ian
Subject: Re: Vibiemme pressure drop - is that ok?
On 12 Dec 2006 08:10:21 -0800, ns.gaga@gmail.com wrote:

>Hi everybody,
>I've recently purchased Vibiemme Domobar (single boiler) - it's a
>definite move forward but I have a problem - or is it simply my
>ignorance?
>Problem is that when I raise the lever to the top position it loses all
>the pressure and it doesn't make sense to me - it drips and makes a
>semi-decent coffee (which could also be due to my grinder), but I'm
>wondering if it's just a lousy coffee comparing to how it should be.
>And in details, first, when I go to the middle position it starts the
>pump, that's obvious, it's like when pressing the red button for
>the water - the pressure is ok, it shoots up to almost 12 bars (maybe
>too much, and too fast?) and pump is clearly working and sounding
>properly, I think. Then, as I continue and move it further up - it
>instantly drops the pressure to something like 2 bars!? Then it starts
>dripping after 4-6 secs, which seems ok more or less, but the entire
>time the pressure is below 6 bars at most - starts w/ 2 (as the lever
>arrives at the top) and then slowly increases to 3,4 and maybe 6, but
>nowhere near 9 or so.
>It behaves similarly when I pull some water on the left - so its
>either a bug or a feature?
>If anyone could explain it to me I'd be eternally grateful - any
>experiences?
>Thanks in advance,
>Dragan
>
>P.S. And in that sense, what about the pre-brewing? Is it possible at
>all or not, middle-position doesn't seem to do anything.

on an e61 there are two lever positions full down and full up.

It's normal on an e61 for the pressure to rise to about 4bar and then
climb to [whatever is higher of OPV or puck resistance] after about
6-8 seconds.

If you flush your shower screen after the shot, the pressure will drop
to nearly 0.

On the next shot ~4bar for ~6sec climbing to MAX for shot duration