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Old 10-11-2008, 06:44 PM   #1
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Default Mash tun performance

For all who mash in converted coolers, how many degrees does your guys mash drop during an hour rest? In a test run with just water, mine dropped about 2.5 degrees over an hour, which seems kinda sucky.


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Old 10-11-2008, 06:49 PM   #2
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That is really good! When you have grain in there, you will see a little less, the grist will hold heat better than water will.


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Old 10-11-2008, 07:46 PM   #3
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It all depends on your cooler, too. What kind of cooler do you have? With some coolers the lid is not insulated....it's just a hollow lid. If this is what you have, go to Home Depot or any other hoe store and buy a can of "Great Stuff". It is an expanding insulating foam. Drill a few holes in the top of the lid, spray a bunch in there and TADA!!!.....insulated lid.
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Old 10-12-2008, 12:33 AM   #4
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Quote:
Originally Posted by talleymonster View Post
It all depends on your cooler, too. What kind of cooler do you have? With some coolers the lid is not insulated....it's just a hollow lid. If this is what you have, go to Home Depot or any other hoe store and buy a can of "Great Stuff". It is an expanding insulating foam. Drill a few holes in the top of the lid, spray a bunch in there and TADA!!!.....insulated lid.
I did that earlier this week actually. Great minds.....

Just wondered what the average performance of the converted cooler is. Mine is a 5 gal. cylindrical. And man, does "Great Stuff" make a mess. That stuff does NOT come off your hands. I had to raid my GF's nail polish remover to get rid of it. She's gonna be pissed.

and hoe store is funny.
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Old 10-12-2008, 04:20 AM   #5
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I'm a terrible typist. I hunt and peck all day. I never learned the "home row" as a kid.
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Old 10-12-2008, 12:39 PM   #6
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I used to loose 6-7 degrees with my blue square igloo but now that I used a can of "Great Stuff" in the lid, I only loose 1 degree.
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Old 10-12-2008, 01:32 PM   #7
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A loss of 2.5 degrees over an hour is damn good using just water! As others have indicated, the grist will hold heat much better and you'll hold temps pretty closely. I expect a degree of loss over the hour.

Insulating the lid with GS works extremely well, but I've started using a piece of two-inch thick foam insulation cut to size and laid on top of the grainbill- didn't lose nary a degree.
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Old 10-12-2008, 02:17 PM   #8
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0 (with grain)
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Old 10-12-2008, 02:21 PM   #9
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When you did your test run, did you pre-heat the cooler?
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Old 10-12-2008, 02:29 PM   #10
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Yes I did, dumped in 185 degree water and let it chill for half on hour, then opened it and let it come to mash temp. I only used 3.75 gal, so I guess it works better than I thought.

Do you guys ever compensate for the temp drop? Say if it drops 2 degrees, mash in a degree higher than your goal so the average temp is at your rest temp?


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