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-   -   Should I stir or not? (http://www.homebrewtalk.com/f36/should-i-stir-not-64393/)

walther 04-30-2008 07:00 AM

Should I stir or not?
 
Hi,

During mash I have heard that you should not stir the grain ?

Why is that? is it oxygenation? (not a very efficient way of adding oxygen)

Normally if I wanted to extract something I would create as much movement as possible,..

Thank you,
walther

BarleyWater 04-30-2008 07:14 AM

It's to make sure that the temperature stays even throught the mash and create a bit of turbidity to help wash the sugars from the grains. Some people don't stir, others say it helps efficiency, I stir.

Brewsmith 04-30-2008 07:20 AM

Stir until the strike water is completely mixed in and there are no dry spots. I usually stir every 10 minutes or so for the first half hour of the mash just to make sure the temperature is where it needs to be. After that I leave it alone. I'm not saying don't stir after that, I'm just saying I don't need to.

agentgonzo 04-30-2008 09:37 AM

From what I have heard, people say not to stir the mash as then you get a lot of the flour out of the grain which can settle at the bottom and cause a stuck mash. This is probably if your manifold/false bottom is not very good. I always stir and have never had a problem since I modified my manifold to add more slots.

I vigorously stir my mash about half way through as I have found that without this, the dissolved gases in the water come out of solution during the mash, cling to the grain husks and make the grain bed float rather than compacting down into a filter bed.

Sigafoos 04-30-2008 12:51 PM

Do you lose any heat if you open the top of your MLT to stir? (I'm obviously thinking of a converted cooler in this scenario) It seems like it'd be harder to keep the temperature up if you were exposing the water and grains to air and then stirring it around.

bradsul 04-30-2008 01:05 PM

You lose heat every time you open the lid and you lose heat any time you stir. For what it's worth I was definitely in the 'stir often' camp when I started AG. Eventually I stopped stirring except at dough-in and just before vorlaufing, I had no change in my efficiency so I don't worry about it anymore.

maltMonkey 04-30-2008 01:25 PM

I didn't used to stir, but now I have a HERMS and whenever I recirculate I have to stir or else one part of the mash will be at 170 while the thermometer reads 149. I always lose a few degrees when I open the lid but the HERMS quickly counteracts that. My efficiency hasn't changed since I started stirring.

TexLaw 04-30-2008 01:33 PM

I just stir when I mash in or add water to the mash.


TL

jezter6 04-30-2008 01:59 PM

+1 to the only stir when needed camp.

I stir when I mash, and I stir when I batch sparge.

DesertBrew 04-30-2008 02:04 PM

I only stir at mash-in. Heat loss...


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