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Old 07-21-2009, 09:16 PM   #1
Judochop
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Default Mash Out

I’d like to be able to mash out for all the wonderful and controversial benefits it brings, but it never seems to work. Meaning, my mash temp never gets anywhere close to the 168-170 I’m shooting for.

My mash temps are typical: 148-154, and I add two gallons of boiling water and stir. I get about a 5 or 6 degree boost. Adding a lot more water isn’t always an option for me since I’ve got a 10 gallon stainless steel MLT and I do like to do bigger beers, and in those cases the 2 gallons of additional water already takes me to the brim.

So… I’m considering applying heat to the MLT to get the mash to the upper 160’s. But I know I don’t want to scorch, so to avoid that I’m also considering re-circulating while I apply heat. I achieve the benefits of vorlof AND mashout all in one genius step!

Anybody tried this before? Anybody heard of anybody trying this before? Anybody have any reasons why I shouldn’t try it? Can it be possible that I am NOT a genius for some reason?

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Old 07-21-2009, 09:28 PM   #2
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I don't mash out, but rather batch sparge twice using half of my targeted pre-boil volume minus my first runnings. My efficiency varies between 70%-80% depending mostly upon the size of my grain bill. How big are your batches? Can you give us a run down of your typical mash size and thickness?

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Old 07-21-2009, 09:33 PM   #3
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Green Bay Rackers--Mash Calculators

10lbs grain mashed at 154 requires 4.6qt boiling water to go to 168.
Add and stir well, it will work because math and physics say so.
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Old 07-21-2009, 09:33 PM   #4
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I think there are a few small commercial brewhouses that use heated mlt's and rakes to obtain their mash out temps.
As for reasons that you shouldn't, none come to mind. Be careful with the heat ( these commercial guys have steam jacketed tanks )

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Old 07-21-2009, 09:39 PM   #5
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If you have a heated MLT and can recirculate I see no reason not to do it your way, except if you want to do a decoction. I usually do a infusion from the green bay rackers calculator to get it to 165-168.

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Old 07-21-2009, 09:48 PM   #6
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I usually add about 6 to 7 qts of boiling water for mashout and I rarely get above 165F. Never to 168, even though the math seems to suggest I should. Who knows. I stopped caring about it.

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Old 07-21-2009, 09:50 PM   #7
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you could always go with a rims/herm system. To ghettofy this I put some copper coils into a cooler with 2 water heater elements in it. Now I just turn on my pump and run the wort through the copper coils and back into my sparge arms. I also added a second ball valve to the cooler and I can use it for sparging as well. total cost was about 60 dollars.

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Old 07-22-2009, 03:19 PM   #8
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Quote:
Originally Posted by z987k View Post
Green Bay Rackers--Mash Calculators

10lbs grain mashed at 154 requires 4.6qt boiling water to go to 168.
Add and stir well, it will work because math and physics say so.
I guess I need to have a talk with these guys 'math' and 'physics'.
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Old 07-22-2009, 03:36 PM   #9
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Quote:
Originally Posted by Judochop View Post
I guess I need to have a talk with these guys 'math' and 'physics'.
For some strange reason, the math and physics part works for everyone in this reality.

What is the size of your grain bill and what is the thickness of your mash? Put that in the calculator and see what comes up. If you're mashing 40 lbs of grain at 2.0 qts/lb, then 8 qts of 212° F water will raise the temp 5 degrees.
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Old 07-24-2009, 04:39 PM   #10
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It just struck me... I've got 1.5 gallons space under my false bottom, and I've never considered that volume of liquid in the calculations for raising mash temp for mash out. The calculator asks for lbs of grain and mash water, but surely an additional 1.5 gallons of 152 degree wort in the tun changes things a bit.

Does that make sense?

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