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Old 12-27-2013, 08:45 PM   #21
crane
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My 2 cents.

1" stir bar works best in 2000ml or smaller flasks. It works fine most of the time in my 5000ml flask except with highly flocculent yeasts like wheat because the yeast will form large clumps and settle towards the outside of the flask where the liquid is not rotating much. When I turn up the speed all the way the wort is rotating very fast towards the center but is barely rotating towards the outside.

The 2" stir bar creates a wider column of rotating wort to help keep yeast clumps from settling towards the outsides of the flask, which also prevents larger clumps from forming I'm the first place. However, I do have a harder time keeping the 2" bar from being thrown but I can get it going fast enough to create a small vortex which is all you need. My 1" stir bar can hold on no matter how high I turn up the speed.

My stir plate uses cylindrical magnets. I recently replaced 1 of the failing drives in my NAS so I now have a couple of hard drive magnets waiting for me to try out to see if they work better for the 2" stir bar.

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Old 12-28-2013, 02:09 AM   #22
MrMeans
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I use a 1.5 inch stir bar with a center ring. I have a 2000 ml beaker instead of a flask. I get great results with it, if I crank my plate all the way up my cone will stretch all the way down to the bar. From what I gather the point of the stir plate is to oxygenate and to keep everything in constant motion. You do not need an insane amount or agitation to properly aerate starter wort.
If you are concerned about not enough agitation you can always step up your stir plate motor. I have a second stir plate I built using the motor from a 10" fan and used a wall dimmer as my power control. That will get you a nice amount of agitation even with the smaller bar. I use that stir plate with my fermenters. I leave them running on that for a few hours to aerate my wort and I still use my little 1.5" bar.

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