So the machine was on when you adjusted the pressure?

Did you just us a straight screwdriver do change it?  

Date: Thu, 12 Jul 2012 01:21:36 -0700
From: [email protected]
To: [email protected]
Subject: Re: Brewtus 4 issues

i did not change my pump. i merely adjust the OPV pressure while using a blind 
portafilter. 
after that, no more bouncing pressure during extraction.
cheers!

On Wednesday, 6 June 2012 14:42:02 UTC+8, gshokar  wrote:I am having somewhat 
of a similar problem, I am constantly brewing at

4-5 bar pressure.  I am not getting much crema out of my shots, they

are verry dark, oil like, and the crema doesn't begin until my shot

are about 3 quarters extracted.



I've had my brewtus 4 - Vibe machine for a few months now and I am not

happy with it yet.   I am giving it some time to try to work out the

bugs but I can't produce consistent shots with any sort of crema.  I

am using a Bartaza Vario - W as my grinder, at setting 1:(S-Z).  This

is a pretty fine grind setting for those of you who don't use Baratza

Vario's.



The problem I am having is the vibe pump almost always chokes if I

were to tamp to hard or grind too fine.  The Pressure bar raises up to

10-11 then the vibe pump almost sounds like it shuts off and the

pressure drops to 4 then it slowly goes up again and then stops once

the pressure gets up too high.  Now the pressure drops as soon as the

coffee begins to come out of the portafilter which would explain the

pressure drop but I am wondering if this is normal.

If I were to get a regular shot out of the Brewtus within the 25-28

second window the pressure gets up to 4 bar max.

I am not getting much crema this way at all.



I purchased beans from a cafe that they just used on their La Morcozzo

machine and the crema it produced versus my machine was night and

day.  Do I have false expectations of what a prosumer machine can do?



Will moving to a rotary pump do anything for me?




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