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NS Oscar Pump Behavior
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Discussions > Espresso > Machines > NS Oscar Pump...  
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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 656
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 Tue Sep 18, 2012, 5:26pm
Subject: NS Oscar Pump Behavior
 

Hey everyone,

I've got a quick question about my Oscar, which I recently bought used. When pulling a shot, I've noticed that the pump will run with a normal hum but if it seems like it senses it needs more power, you can hear it almost kick in harder and the flow suddenly gets a little stronger. Is this normal? I'm still getting used to this machine. Thanks!
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Tue Sep 18, 2012, 6:11pm
Subject: Re: NS Oscar Pump Behavior
 

Markarian Said:

I've noticed that the pump will run with a normal hum but if it seems like it senses it needs more power, you can hear it almost kick in harder and the flow suddenly gets a little stronger.

Posted September 18, 2012 link

I am not sure what you mean about needing more power, but the pump may change noise with the heater going on and off.  I have a Gaggia with PID and when the PID is on alarm function there is some temperature oscillation, heater on/off oscillation, and corresponding pump noise oscillation.  Pump varies as its about 50 watts are overwhelmed by the heaters need or 1000+ watts on the shared circuit.

 
D4F also at
http://www.gaggiausersgroup.com/
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germantownrob
Senior Member
germantownrob
Joined: 2 Dec 2007
Posts: 2,140
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Tue Sep 18, 2012, 7:19pm
Subject: Re: NS Oscar Pump Behavior
 

Very normal for a vibe pump to have different sounds depending on the amount of resistance. The pump will be loudest when there is no resistance and quietest when the flow is blocked, when blocked the pump is trying to makes its maximum pressure. The OPV on the Oscar is more there to protect the pump and keep the pressure below 14 bars. I believe what you are hearing while pulling the shot is the pump getting quiet as it hits the dry puck, as the puck saturates the water begins to flow easier and the pump is getting louder. The smoothness of the flow can be adjusted with grind and dose (always with consistent  and proper distribution and tamping) which allows you to change the flavor of the shots.
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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 656
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 Tue Sep 18, 2012, 11:04pm
Subject: Re: NS Oscar Pump Behavior
 

Okay, well that's good to hear. In the meantime, I'm getting a bit frustrated with my shots. They aren't BAD, but almost every time I pull a shot, I get a soggy puck. Decaf, regular, light roast, dark roast, choked powder, coarse gusher, you name it. I thought I'd get a dry puck every time with the Oscar since I moved up from the Saeco, but it's still a long way from where I feel it should be. I keep worrying there's something wrong with this used unit, but I don't really have a point of reference as this is still new to me.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,009
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Wed Sep 19, 2012, 12:29am
Subject: Re: NS Oscar Pump Behavior
 

I know how you feel, I had never pulled an espresso shot before I got my used machine.  I have had good shots with wet pucks.  I sometimes get dry ones but mostly they are damp on top I think because there are a few drips that come off after I turn the pump off.  What is in the cup matters.... Check that you have enough head space before you pull a shot do the nickle test. (espresso my espresso site tells you in great detail how to do it)  Since I don't use the spring in my naked filter sometimes my puck sticks to the the group head so I don't believe it is a pressure thing.  Just look at youtube for video of pulls to hear an oscar pump sound.  And don't worry about the pucks that much.

 
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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germantownrob
Senior Member
germantownrob
Joined: 2 Dec 2007
Posts: 2,140
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Wed Sep 19, 2012, 4:03am
Subject: Re: NS Oscar Pump Behavior
 

My pucks are always towards the soggy side unless I let the PF sit in the group foe a min or so. A 3 way valve is releasing pressure which allows the PF to be taken out with out a spray of hot water spraying everywhere, it does not suck every last ounce of moisture from the spent puck. Daily back flushing and weekly chemical back flushing keeps the my 3way clean, if is gets dirty you will understand the difference from a soggy puck to a soupy mess of a puck. I do not find a chemical back flush does much for getting all the gunk and oils off the screen and needs to be removed once a week ( for me ) to keep things flowing well and staying tasty.
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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 656
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 Wed Sep 19, 2012, 5:06am
Subject: Re: NS Oscar Pump Behavior
 

I just realized the three of us have the same machine and the same grinder. Fancy that.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,009
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Wed Sep 19, 2012, 11:08am
Subject: Re: NS Oscar Pump Behavior
 

I believe it is a good set up at a good price.  Compact and portable and gives good results.

 
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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e53er
Senior Member
e53er
Joined: 21 Apr 2002
Posts: 162
Location: L.A.
Expertise: I live coffee

Espresso: NS Oscar, Solis SL90
Grinder: Mazzer Mini, Solis Maestro
Vac Pot: Bodum Santos
Drip: KMB, Hario V60 dripper
Roaster: Poppery II
Posted Wed Sep 19, 2012, 2:08pm
Subject: Re: NS Oscar Pump Behavior
 

I have recently pulled ristretto shots where the stream starts out fine, then a few seconds later the shot gushes out, accompanied by a louder pump noise. After this happens, I see a depression in the spent puck, indicating channeling. I could also observe this behavior with the naked portafilter whereby I actually saw a thin stream of water being expelled at the pf edge when the gushing occured! So my theory is that it depends on the bean type, grind fineness and the uniformity of the grinds in the basket (e.g. how well you tamped).
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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 656
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 Wed Sep 19, 2012, 6:20pm
Subject: Re: NS Oscar Pump Behavior
 

I'm starting to definitely think it's my technique, because this morning I had much more uniform (albeit overextracted) shots. I had no channeling, but I think my grind was too fine. I'm really impressed with the Vario-W and I really am loving it so far. I have a naked PF on its way from Chris' Coffee so hopefully that will help me out. I think my issue might lie in dosing and tamping especially since my tamper has ragged edges on it from where the former owner used it as a hammer! (no joke!) Again, I have a new tamper on its way as well. Also, how much should I be dosing into the standard NS doubleshot basket? I'm doing 22.5g with varying results, but am I overdosing?

My puck always comes out with a little puddle on top, but knocks out intact. I guess that's decent?
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