Air from the group

Post general questions about operation of your new Mini here. Due to many similarities with the original VII you should also check the VII forum.
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oton

Air from the group

Post by oton »

A video is worth a thousand words

http://www.youtube.com/watch?v=2Au0Mwj-saU


Could anyone tell me what's happening? :disgust:
Endo

Re: Air from the group

Post by Endo »

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.
oton

Re: Air from the group

Post by oton »

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...
BobUSN

Re: Air from the group

Post by BobUSN »

Gesundheit!
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chas
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Re: Air from the group

Post by chas »

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?
Chas
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Endo

Re: Air from the group

Post by Endo »

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.
JohnB

Re: Air from the group

Post by JohnB »

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

Re: Air from the group

Post by Endo »

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).
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