Originally Posted by BassBurner
I'm thinking of including a mash out on my next batch, a cream ale, which has a small enough grain bill to use my fly sparge setup.
My recipe which includes 10.75# of grain comes out to:
Mash in @ 1.25 qt/lb: 13.13 qts at 174.3
Mash out @ 1.75 qt/lb: 5.25 qts at 197.7
There's a slight arithmetic aberration in your calculations.
The mash out at 1.75 qt/lb with 10.75 lbs grain would be 5.75 gallons, not 5.25 qts.
I have a 5g cooler, and most of my brews use between 10 to 11.5 lbs grain.
I always do a mash out and have plenty of room to spare.
I use about 1 qt/lb for the mash water, and 1g ~ 200 degree water for the mash out, and there's plenty of room. I've even managed a mash out with 13 lbs grain (but that was getting a bit tight).
I prefer a thicker mash than the 1.25 qt/lb as it gives me a more dextrinous wort (which I prefer).
When I started mashing out, I got an increase in efficiency from 75% to 85%
Hope this helps.