Mash temp issues - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Mash temp issues

Reply
 
Thread Tools
Old 07-01-2011, 05:22 PM   #1
Blackhawkbrew
HBT_SUPPORTER.png
Recipes 
 
Jan 2008
Cleveland, Ohio
Posts: 481



Having some trouble holding mash temps with my 48 quart Rubermaid cooler. Mashed in at 165* and closed the lid at 155. It has dropped 6 degrees in 40 minutes! (doing a 90 minute mash). And that's with 2 blankets around it! Is it time for a new cooler? I should check the thermometer also.



 
Reply With Quote
Old 07-01-2011, 06:35 PM   #2
Nateo
Recipes 
 
Jul 2010
Bennett Springs, MO
Posts: 2,050
Liked 39 Times on 30 Posts


Are you preheating the tun?

Was 165* the temp of the strike water, or your mash was actually at 165*?

Is there any reason in particular you're doing a 90min mash? I generally only need 20min or so before I can start vorlaufing.


__________________
To paraphrase Dr. England - "Off-flavors smooth with time. So do mountains. Brew it right from the start!"

My blogsite: http://nateobrew.blogspot.com/

 
Reply With Quote
Old 07-01-2011, 06:53 PM   #3
Blackhawkbrew
HBT_SUPPORTER.png
Recipes 
 
Jan 2008
Cleveland, Ohio
Posts: 481


Mash tun was preheated with 170*. I mashed in at 165*. I checked it before vorlaufing with another thermometer and it read 150* in several different spots, may be my thermometer.

I'm brewing BM's Cream of 3 Crops and he does 90 minute mash in his directions. 90 minute boil also - makes for a long brewday.

 
Reply With Quote
Old 07-01-2011, 07:22 PM   #4
Zaphod
Recipes 
 
Jun 2008
Denver, CO
Posts: 111
Liked 8 Times on 7 Posts


Mostly sounds like you have non-uniform temperatures in the mash and need to thoroughly mix it. You're just measuring two different temp zones. An igloo cooler should not be losing that much heat. Don't worry too much spending a couple minutes just stirring and breaking up the grain. Even with the lid off, it won't lose much heat over a couple minutes.
Or like you said, could be the thermometer. One of mine had a a plastic/rubber dipped tip, and once that got slightly chipped off, it started reading all over the place.
__________________
Crooked Mouth Brewing

Fermenting:
Belgian Cherry
100% Brett Citra Pale
Sour Quad (group Quad aged in a Stranahan's barrel)
Sloppy Seconds Funky/Sour Thing with Al's Bugs

Kegged:
TighPA
Imperial Chocolate Oatmeal Stout
Bruegel the Elder (16 mo old lambic aged in a Temptation barrel)
Flanders, Ned (group 2+ year old Flanders Red in a Temptation barrel)

 
Reply With Quote
Old 07-01-2011, 07:53 PM   #5
Blackhawkbrew
HBT_SUPPORTER.png
Recipes 
 
Jan 2008
Cleveland, Ohio
Posts: 481


Temps must not have been too much of a factore, my pre-boil gravity was 1.041. Beersmith had it at 1.037.

 
Reply With Quote
Old 07-01-2011, 08:20 PM   #6
Catt22
Recipes 
 
Jan 2009
Posts: 4,998
Liked 69 Times on 62 Posts


Quote:
Originally Posted by Zaphod View Post
Mostly sounds like you have non-uniform temperatures in the mash and need to thoroughly mix it. You're just measuring two different temp zones. An igloo cooler should not be losing that much heat. Don't worry too much spending a couple minutes just stirring and breaking up the grain. Even with the lid off, it won't lose much heat over a couple minutes.
Or like you said, could be the thermometer. One of mine had a a plastic/rubber dipped tip, and once that got slightly chipped off, it started reading all over the place.
+1 This is very likely what is going on. Good advice.



 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Johnson A419 temp controller issues Daniel82 Equipment/Sanitation 25 12-21-2010 05:02 PM
mash temp location jtrainer Equipment/Sanitation 2 07-03-2010 05:09 PM
Love Temp probe issues? SugarJohnson Equipment/Sanitation 3 01-20-2010 05:19 PM
Flow rate issues for 55 gallon mash tun Bullka Equipment/Sanitation 27 12-30-2009 12:23 AM
Temp Issues Hopper31 Equipment/Sanitation 11 01-06-2008 06:40 PM


Forum Jump