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Pump Ramp Time
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Markarian
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Markarian
Joined: 27 Jun 2012
Posts: 652
Location: Seattle Area
Expertise: I love coffee

Espresso: ECM Technika IV Profi WT-WC
Grinder: Baratza Forte AP, HG One
Vac Pot: Bunn Trifecta MB
Drip: Moka, Aeropress, Hario V60
Roaster: Behmor 1600
Posted Sun Mar 31, 2013, 10:37pm
Subject: Pump Ramp Time
 

So I was curious about time it takes between turning the pump on and first drip. On my Oscar, it's a really long time. It can last between 7-10 seconds, but the shot isn't necessarily choked. However, if I start a shot RIGHT AFTER a boiler autofill cycle, I get an almost immediate flow of espresso. Is this just how the Oscar works, or is my flushing routine messing things up?
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 2,972
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Mon Apr 1, 2013, 10:08am
Subject: Re: Pump Ramp Time
 

Mine takes 3-5 seconds to start dripping and if the pump fills the boiler during the pull I get slower flow not more....

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

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Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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dspear99ca
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Joined: 17 Jan 2013
Posts: 93
Location: BC, Canada
Expertise: I love coffee

Espresso: Gaggia Coffee
Grinder: Mazzer Mini
Posted Mon Apr 1, 2013, 12:10pm
Subject: Re: Pump Ramp Time
 

When my boiler is full, it takes ~5 seconds.  If I use the steamer to make a latté and don't manually refill the boiler afterwards (my machine does not autofill, filling only occurs when pump runs), it might take 10 or even more seconds.  I've made it a habit to pull some water through the grouphead after steaming as shot quality suffers when I start with a partially full boiler due to temperature inconsistency.
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 2,972
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Mon Apr 1, 2013, 1:02pm
Subject: Re: Pump Ramp Time
 

I don't recalling pulling a shot right after boiler fill but if the heater kicks on it slows down my pour due to voltage I believe.  I was thinking heater when I said this.  I believe it will not fill the boiler while pulling.

Coffeenoobie Said:

Mine takes 3-5 seconds to start dripping and if the pump fills the boiler during the pull I get slower flow not more....

Posted April 1, 2013 link


 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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