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Air from the group

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Air from the group

Postby oton » Sat Feb 27, 2010 9:02 pm

A video is worth a thousand words




Could anyone tell me what's happening? :disgust:
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Re: Air from the group

Postby Endo » Sat Feb 27, 2010 11:43 pm

Not sure. Maybe a small air bubble in the lines?

Mine does the exact same thing. I'm not worrying about it. The flow doesn't seem to slow down at all and I'm sure it has not effect once the sceens are installed.
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Re: Air from the group

Postby oton » Mon Mar 01, 2010 7:02 pm

Endo wrote:Mine does the exact same thing.


Good to know it. :sign7: Thanks. I thought it was a problem of my Mini.

The flow doesn't seem to slow down at all and I'm sure it has not effect once the sceens are installed.


If you look carefully you will see bubbles coming from the screens...
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Re: Air from the group

Postby BobUSN » Tue Mar 02, 2010 12:13 am

Gesundheit!
Blessed regards,
Bob

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Re: Air from the group

Postby chas » Tue Mar 02, 2010 1:38 pm

I've never seen an S1 or VII do this so it must be caused by the differences in the MIni design. That pretty much narrows it down to either the tank or the Vibe pump.

OR the mechanical preinfusion device. Do all those of you that are seeing this have the mech PI device?
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Re: Air from the group

Postby Endo » Tue Mar 02, 2010 5:00 pm

Without getting too technical, I suspect it is due to inertial cavitation. I'm almost certain this does not exist when the flow is retricted by the dispersion disc, coffee and basket. So this is a non-issue in my mind.
Endo

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Re: Air from the group

Postby JohnB » Wed Mar 03, 2010 4:34 pm

Endo explains his theory in more detail in this video. :grin:
http://www.youtube.com/watch?v=rSptBjvVo9E
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Re: Air from the group

Postby Endo » Thu Mar 04, 2010 2:00 am

Geeez, that was a waste of a good 7 minutes. I kept shouting "get to the point"! :violent1:

I think the standard "wiki" link explains it well (if anyone is interested in learning more).
Endo

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Mazzer Super Jolly, B.Vario, Zass 175M, PeDe 435, KYM Mokka
Hario Drip, Espro and Coffeelab Tampers
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