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Why I think the Expobars run hot...
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Discussions > Espresso > Machines > Why I think the...  
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mike01
Senior Member


Joined: 21 Jan 2004
Posts: 372
Location: SE Michigan
Expertise: I love coffee

Espresso: Izzo Alex
Grinder: Mazzer SJ, Vario-W
Vac Pot: Yama Stovetop
Drip: Bunn Trifecta
Roaster: Hottop
Posted Sun Oct 17, 2004, 8:55pm
Subject: Re: Why I think the Expobars run hot...
 

Lefty69 Said:

I still think there is an issue withe the HX design on some of these. ....
 Have you tried lowering your brew pressure....
In any case, your machine does seem to have an over temp issue>  i would call and talk to todd some more>

Posted October 17, 2004 link

I'm wondering the same thing about the HX design.  Last time I talked to Todd, he seemed to think the Expobar machines were designed to be run at lower boiler pressures.  However, since your new machine could get a 201F temp with a 1.2 Bar boiler pressure, that doesn't seem to be the case, since I was getting a temp of 210F with the same boiler pressure.  So... since expobar seems to frequently change the types of parts in their machines (ex- the different pressurestat in the new machine), is this a case of a modified design between the machines, or could it be an isolated case of a couple of defective machines since you and I seem to be the only ones reporting this problem?  I have not tried lowering the brew pressure as I do not have a pressure gauge yet.  I tried ordering one from EPNW when I placed an order last week, but they were on backorder, so I may try ordering another.  Anyways, I do agree that my machine has an overtemp issue and I plan on calling todd again tomorrow.
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Lefty69
Senior Member


Joined: 14 Apr 2004
Posts: 282
Location: Elkridge, MD
Expertise: I live coffee

Espresso: Expobar Pulser
Grinder: Mazzer Mini, Capresso...
Vac Pot: B&D Infuze
Drip: Melitta Clarity,
Roaster: GG/SC Combo, Behmor
Posted Mon Oct 18, 2004, 6:12am
Subject: Re: Why I think the Expobars run hot...
 

Order a gauge from Grainger.  It is like $7 plus shipping. With about $3 in parts from Home depot you have a guage you can attach to your portafilter.

Eric
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Rawman
Senior Member
Rawman
Joined: 14 Jun 2003
Posts: 1,034
Location: SF Bay Area, CA
Expertise: I love coffee

Espresso: 2002 Cremina, Elektra MKAL,...
Grinder: Mazzer Mini
Vac Pot: Silex Vintage Vac Pot
Drip: Bodum chambord FP, Melitta...
Roaster: HotTop, Buzzroaster,  HG/DB
Posted Mon Oct 18, 2004, 8:17am
Subject: Re: Why I think the Expobars run hot...
 

How do you lower the brew pressure?  I thought brew pressure was related to grind and tamp, and then there was some kind overpressure valve which could be set at 9 or 10 bar.

 
Rawman the Expobarbarian..
AKA the Original Jon R.
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Lefty69
Senior Member


Joined: 14 Apr 2004
Posts: 282
Location: Elkridge, MD
Expertise: I live coffee

Espresso: Expobar Pulser
Grinder: Mazzer Mini, Capresso...
Vac Pot: B&D Infuze
Drip: Melitta Clarity,
Roaster: GG/SC Combo, Behmor
Posted Mon Oct 18, 2004, 9:09am
Subject: Re: Why I think the Expobars run hot...
 

Setting the OPV to a certain pressure regulates the brew pressure.  It bleeds off excessive pressure, so that the water pressure at the puck is at the desired level.  Stock, the two expobars I have had both were set at about 12 bar.  Bitterness was greatly reduced by bringing it down to ~9 Bar.

Eric
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mike01
Senior Member


Joined: 21 Jan 2004
Posts: 372
Location: SE Michigan
Expertise: I love coffee

Espresso: Izzo Alex
Grinder: Mazzer SJ, Vario-W
Vac Pot: Yama Stovetop
Drip: Bunn Trifecta
Roaster: Hottop
Posted Mon Oct 18, 2004, 1:07pm
Subject: Re: Why I think the Expobars run hot...
 

Lefty69 Said:

Order a gauge from Grainger.  It is like $7 plus shipping. With about $3 in parts from Home depot you have a guage you can attach to your portafilter.

Posted October 18, 2004 link

That's what I initially wanted to do, however I got this message. Is there a way to buy from them if you are not a buisness?

"Grainger is a wholesaler, not a consumer retailer. We sell to other businesses.  If you do not qualify as a business, there may be another way for you to purchase our products.  Your local branch may be able to provide you the name of a reseller in your area that sells Grainger's products on a retail basis. "
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Rawman
Senior Member
Rawman
Joined: 14 Jun 2003
Posts: 1,034
Location: SF Bay Area, CA
Expertise: I love coffee

Espresso: 2002 Cremina, Elektra MKAL,...
Grinder: Mazzer Mini
Vac Pot: Silex Vintage Vac Pot
Drip: Bodum chambord FP, Melitta...
Roaster: HotTop, Buzzroaster,  HG/DB
Posted Mon Oct 18, 2004, 3:10pm
Subject: Re: Why I think the Expobars run hot...
 

I tried to buy from them as well but was told the same thing from my local Grainger office.  They said I couldn't purchase since I wasn't a business.  

I was considering this one for the boiler pressure (I found that the steam tip is a 1/8" standard pipe thread)

Click Here (www.marshbellofram.com)

and this one for portafilter pressure measurement:

Click Here (www.marshbellofram.com)

Would these be ok?

 
Rawman the Expobarbarian..
AKA the Original Jon R.
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mike01
Senior Member


Joined: 21 Jan 2004
Posts: 372
Location: SE Michigan
Expertise: I love coffee

Espresso: Izzo Alex
Grinder: Mazzer SJ, Vario-W
Vac Pot: Yama Stovetop
Drip: Bunn Trifecta
Roaster: Hottop
Posted Mon Oct 18, 2004, 3:31pm
Subject: Re: Why I think the Expobars run hot...
 

If I'm not mistaken, you need a fluid-filled pressure gauge for reading brew pressure or use a snubber in conjunction with a standard gauge, otherwise the measurements will be unreadable with a vibe pump.
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JonR10
Senior Member
JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
Vac Pot: Hario Tabletop, Yama...
Drip: Technivorm
Roaster: 1-lb US Roaster, Behmor 1600
Posted Mon Oct 18, 2004, 4:22pm
Subject: Re: Why I think the Expobars run hot...
 

mike01 Said:

That's what I initially wanted to do, however I got this message. Is there a way to buy from them if you are not a buisness?

"Grainger is a wholesaler, not a consumer retailer. We sell to other businesses.  If you do not qualify as a business, there may be another way for you to purchase our products.  Your local branch may be able to provide you the name of a reseller in your area that sells Grainger's products on a retail basis. "

Posted October 18, 2004 link

We have two grainger stores here in Houston.  One sells to the public and the other does not.  Have you gone to www.grainger.com and tried ordering online?  

My friend (bubble_boy) walked in to a Grainger store and got a couple of those gauges for ~$7 each.  If you search on his posts you'll see pics...

 
Jon Rosenthal
Houston, TX
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Rawman
Senior Member
Rawman
Joined: 14 Jun 2003
Posts: 1,034
Location: SF Bay Area, CA
Expertise: I love coffee

Espresso: 2002 Cremina, Elektra MKAL,...
Grinder: Mazzer Mini
Vac Pot: Silex Vintage Vac Pot
Drip: Bodum chambord FP, Melitta...
Roaster: HotTop, Buzzroaster,  HG/DB
Posted Mon Oct 18, 2004, 4:56pm
Subject: Re: Why I think the Expobars run hot...
 

That above quoted message is directly from the www.grainger.com website.

 
Rawman the Expobarbarian..
AKA the Original Jon R.
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JonR10
Senior Member
JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
Vac Pot: Hario Tabletop, Yama...
Drip: Technivorm
Roaster: 1-lb US Roaster, Behmor 1600
Posted Mon Oct 18, 2004, 5:49pm
Subject: Re: Why I think the Expobars run hot...
 

Rawman Said:

That above quoted message is directly from the www.grainger.com website.

Posted October 18, 2004 link

That is a drawback for sure!!  My experience with Grainger is the prices on most items are too high to be competitive for resale.   Anyway, like I said before, one of the stores here in town has walk-in counter service so if all else fails email me and we'll work something out.  

-Jon

 
Jon Rosenthal
Houston, TX
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