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Oscar espresso pull
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Discussions > Espresso > Q and A > Oscar espresso...  
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frog
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Joined: 20 Nov 2012
Posts: 5
Location: Hong Kong
Expertise: I live coffee

Posted Tue Nov 20, 2012, 9:05am
Subject: Oscar espresso pull
 

Hi all,

I am a newbie here.
I just started playing with an 2nd hand NS oscar.
However, I find that the time for the first drop of coffee is rather long (>10 s). But after that, it seems normal.
I don't think I tamp too hard.

I recorded my espresso pull with a double shot basket and bottomless portafilter.
http://youtu.be/L4_ZTYRyXWs

Is there any potential problem with my machine?
P.S. It is really super-noisy during the brew.

Thanks.
Frog
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
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Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Tue Nov 20, 2012, 11:14am
Subject: Re: Oscar espresso pull
 

Oscars are noisy. Check other youtube videos and you will see what I mean. However, I did hear a rattle that makes me wonder what you have on top or maybe the pump is not seated well. Do the water into the cup to warm it and empty the tray less.  I warm my shot glass and my cup with the water from the group head before the pull. It seems like your pull blonded fast. It did take 10 seconds to show coffee and mine only takes about 5 seconds.  Your pump might need replacing, they are pretty cheap and easy to do.  It would help if you pulled into a clear marked shot glass so I can see what it looks like in the cup.

 
Coffeenoobie

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calblacksmith
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calblacksmith
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Espresso: ECM Vene. A1, La Cimbali M32
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Posted Wed Nov 21, 2012, 5:57am
Subject: Re: Oscar espresso pull
 

I agree with Helen, it seems to take a little long to start extracting, I didn't hear the pump get to full pressure until just before the extraction started.

What grinder do you have? The grinder is more important than the espresso machine. The Oscar is a solid machine and it should serve you well. Tamping is the least important part of the whole process as it is the grind that sets the pace for your extraction. The better your grind, in general, the better the extraction.

The age of your beans is very important also, old stale beans will never make great coffee, old is about two weeks from the day they were roasted regardless of how they were packaged for sale. That is not to say they are undrinkable after that, but you have missed the window of the beans to be able to be used at their peak.

 
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faaparasite
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Espresso: Bezzera BZ99
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Posted Wed Nov 21, 2012, 6:23am
Subject: Re: Oscar espresso pull
 

What you are describing sounds perfectly normal.  Machines with vibe pumps are loud.  That's just the way it is.

My shots take about 8-9 seconds between pump start and first drip, so your experience sounds fine.  It really boils down to how much volume you want.  I like a double that is just shy of 2 oz at 25 seconds from pump start.  If you want more volume, like say a 2.5-3oz double, then first drip is going to start sooner by virtue of grinding coarser.
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frog
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Joined: 20 Nov 2012
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Location: Hong Kong
Expertise: I live coffee

Posted Wed Nov 21, 2012, 9:11am
Subject: Re: Oscar espresso pull
 

Thanks all.

My beans are roasted last month and keep it in the fridge. So, they are fresh.
Maybe I try to have a coarser grind or replace the pump.

But I also find that the stream power decreased a lot after I forth a single cup of milk with 300ml milk pitcher.
The stream tip has been replaced with a single hole one instead of 4 holes.
Any idea? Is it related to the pstat?
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Wed Nov 21, 2012, 11:38am
Subject: Re: Oscar espresso pull
 

BIG DON'T here : Don't keep the beans in the fridge.  
Freeze part of them when you get them and pull out a few hours before use so they warm up before opening.  

Do use beans that have never been frozen in 2 weeks or so.  A month old beans will make less or no creama.

The slow dripping to start with would have nothing to do with the Pstat that is all pump.  The Pstat could have an issue but it is not related to what I saw in the pull.  Go back to the stock tip and see if it is not a lot better.

 
Coffeenoobie

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

My coffee treasure map...
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Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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frog
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Joined: 20 Nov 2012
Posts: 5
Location: Hong Kong
Expertise: I live coffee

Posted Thu Nov 22, 2012, 4:53am
Subject: Re: Oscar espresso pull
 

Thanks for you hints. I will try that in new bags of coffee :)
I have a slightly coarser grind today with the same bag of beans.

http://youtu.be/uo-eQMjfoDI

I don't have a double shot glass. I just find a glass container as the cup (marked 30 and 60cc line).
I found that the some coffee actually comes out at the edge of the filter (start from 13th second).
However, the pull suddenly comes out quickly at 2xth second.
Is that normal?

Thanks.
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Thu Nov 22, 2012, 11:09am
Subject: Re: Oscar espresso pull
 

I saw the sprite that is just tamping flaw. (13 seconds)  What really struck me is it took almost 22 seconds for coffee to come then it was done by 37 seconds.  I really think your pump is not doing it's job because I think the grind must be too coarse but the pump just can't get enough pressure to push it through.  You need to get a replacement pump.

 
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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frog
Senior Member


Joined: 20 Nov 2012
Posts: 5
Location: Hong Kong
Expertise: I live coffee

Posted Thu Nov 22, 2012, 11:23am
Subject: Re: Oscar espresso pull
 

Thanks for you advice. :)
Seems the oscar doesn't do descaling for long time.
Let me do a descaling and replace the pump.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Thu Nov 22, 2012, 9:57pm
Subject: Re: Oscar espresso pull
 

I believe that will go a long way towards fixing your issue.

 
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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