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Discussions > Espresso > Espresso Mods > NS Oscar mod...  
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,036
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Mon Mar 12, 2012, 5:05pm
Subject: NS Oscar mod ideas
 

After much time reading this thread:

Click Here (www.home-barista.com)

I believe there are 3 things I want to do to my Oscar.  I think the gauges/pid he did are very nice but I think these are the most useful things.

  1. Musica gicleurs to help reduce the flushes.
  2. Vacuum Breaker so I can put him on a timer
  3. (Big maybe here) A Group head thermometer.

Click Here (www.home-barista.com)

I am not thrilled with drilling the group head.  Since mine is an 09 I am hoping the group head is threaded already and all I have to do is put the gicleurs in.

Any feed back on this would be helpful.

Thanks,

 
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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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,864
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Mar 13, 2012, 6:41am
Subject: Re: NS Oscar mod ideas
 

Just dial down the Pstat a notch or so, this will reduce the boiler pressure and thus the fulshes, no electronics need.

The Vac breaker is easy to do, I modded my Oscar in about an hour total, not a big deal.

I am not sure of the REAL value to gauges, I have both gauges on my machine and I hardly ever look at them. Others may have different opinions on this and they have as much right to their opinion as I have.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,036
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Tue Mar 13, 2012, 11:04am
Subject: Re: NS Oscar mod ideas
 

Yes as cool as the gauges are, I thought temp/pressure at the group head, are the only ones I would watch and I am very reluctant to put holes in my group head.  I will try turning down the pstat a bit but for 4 $ and added temp stabilization, I will probably end up adding the Musica gicleurs.

 
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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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,036
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Tue Mar 13, 2012, 1:14pm
Subject: Re: NS Oscar mod ideas
 

I keep trying to figure out a cheap way to get temp and pressure at the puck.  I wish I could find a reasonable temp and pressure gauge I could mount on the spout of my extra portafilter.  What if I attached the sensor to the bottom of the back flush basket?  Would that give me a reasonable idea of the water temp at the puck without making holes in anything?

 
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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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,036
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Tue Mar 13, 2012, 2:07pm
Subject: Re: NS Oscar mod ideas
 

What about something like this, with the wire wrapped around the group head?

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHEM4

 
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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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,864
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Thu Mar 15, 2012, 6:46am
Subject: Re: NS Oscar mod ideas
 

Helen
The price of digital thermometers has come down a lot though I still tend to buy more expensive ones but for ball park readings, that one might work out just fine.

The only part that is important is the bead at the end of the wire. That is the part that senses temp. The wire is, well, wire.

When  you attach the temp sensor to the outside of the GH, you are, well duh, reading the temp of the group head, not the temp of the water you are getting in the shot. It depends on my machine just where on the GH I take a reading as to what temp I get, even static. If I for example take a reading in the thicker part of the head, (the vertical part of the E61 gh) I will get (from memory) about 227 or so, moving to the disc part of the GH I get 212.

I can also see the temp drop in the process of the shot but only taking the temp of the water, will tell you what you are getting in the water. I am also using fast acting surface probes, not the bead thermocouple. The beads are designed mainly for things like air temp, not specific spot temp. My temp probe responds in MS, not the MUCH longer time frame that the bead sensors take, and yes I have bead sensors too!)

closed ebay auction for my Omega 88007K EDIT( that link failed so here is a different one)

Omega website, my probe is the 88007K, low temp (480F max) probe. http://www.omega.com/pptst/88000_hightemp.html

A SCACE device is the normal thing used for testing as you know, it will provide pressure and temp readings through the shot, you might be able to get close to temp with a bead probe and a blank back flush disc, you might drill a small hole for the probe ball end (these are not designed to be wet) to fit through and then glue/seal it in place, drill another small hole in the disc to simulate the water flow and put the disc into your PF.

The size of the "flow" hole, will determine the volume of water to pass through it in a set period of time. If you have a naked PF, you might be able to drill a hole in a blank disc and epoxy a small needle valve into it, this will allow you to adjust the flow of the water through the disc and you might be able to achieve some sort of a normal time/volume of water in your measurements.

These were just off the top of my head thoughts, and may only be worth that much in the end!

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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JtothaR
Senior Member
JtothaR
Joined: 20 Dec 2010
Posts: 709
Location: Las Cruces, NM
Expertise: I live coffee

Espresso: Modded Oscar
Grinder: K10, Lusso, GM 875
Drip: Pour-Over, FP, Toddy
Roaster: Agapao, Metropolis, CC
Posted Thu Mar 15, 2012, 2:08pm
Subject: Re: NS Oscar mod ideas
 

calblacksmith Said:

Just dial down the Pstat a notch or so, this will reduce the boiler pressure and thus the fulshes, no electronics need.

The Vac breaker is easy to do, I modded my Oscar in about an hour total, not a big deal.

I am not sure of the REAL value to gauges, I have both gauges on my machine and I hardly ever look at them. Others may have different opinions on this and they have as much right to their opinion as I have.

Posted March 13, 2012 link

+1

- Lower P-stat to reduce flushes / make steaming easier

- Vac breaker is available direct from ns and you just have to carefully bend the steam pipe to install.

- Gauges are only really of value for adjustments or pressure profiling. I personally use the boiler gauge on my machine for p-stat adjustments, and group gauge is for pressure profiling, adjusting infusion pressure, etc. Which oscar is not capable of, so it's of little use.

 
Load and Lock.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,036
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Fri Mar 16, 2012, 11:23am
Subject: Re: NS Oscar mod ideas
 

I have turned down the Pstat a half turn, since I have no way to measure I am just going to try this for a few days.  I was thinking of this valve.  Just got to decide where. Click Here (www.chriscoffee.com)

 
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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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,864
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Fri Mar 16, 2012, 3:59pm
Subject: Re: NS Oscar mod ideas
 

There is a tube that runs from the boiler to your gh. Over the divider / frame of the machine.

I used an inline comression t. From the t it went to a 90 deg elbow then into the vac breaker. That is a nicer one than I had.

Search for the pics I posted a few years ago. They show the mod well.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,036
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Mon Mar 19, 2012, 1:19pm
Subject: Re: NS Oscar mod ideas
 

So, does the breaker need to be upright? or can it be at an angle?  NS wants $9 for each with 25 minimum order. :(

Thanks,

 
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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 View Profile Visit website Link to this post
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