13.5 Gallons Water
Mash Ratio = 2.9 lbs/gallon = 39 lbs grain
Corn = 29.25 lbs (75%) 33 ppg
Rye = 5.00 lbs (13%) 29 ppg
Barley = 4.75 lbs (12%) 35 ppg
Potential specific gravity:
Corn 33 x 29.00 lbs = 957.00 ppg
Rye 29 x 5.00 lbs = 145.00 ppg
Barley 35 x 4.75 lbs = 166.25 ppg
957 + 145 + 166.25 = 1268.25 / 13.5 gallons water =
93.94 or approximately 1.094 SG potential
- Brought 13.5 gallons of water to 205 degrees.
- Added 29.25 lbs of rinsed cracked corn, water temp dropped to 175 degrees, continued heating back to 190 degrees and held for 25 minutes while stirring.
- Turned heat off let cool to 178 degrees and tested PH. The PH was 6.5 so I added citric acid to reduce PH to 5.5, then added SEB-Star high heat enzyme.
- I then put the pot with the corn in my homemade insulated box, made of 2” pink rigid sheet insulation. Starting temp when I put the pot into the insulated box was 176 degrees. I left it in the insulated box for almost 20 hours. The temp was 160 degrees when i took it out of the box. Only a 16 degree drop in 20 hours.
- Checked PH and adjusted it down again from 5.9 to 5.6 with a little more citric acid. I let it cool to 150 degrees and added alpha amylase and the 9.75 lbs of malted Rye and Barley grains.
- I then put it back into the insulated box at a temp of 147 degrees for another 10 hours. The temp was still 141 degrees when I took it out after the 10 hours.
- Took the mash out of the insulated box and tested it for conversion with iodine. The test was good and showed no starch (no black).
- I then took a 4 ounce sample off the top of the mash and cooled to 70 degrees and tested the specific gravity. It only showed 1.041 SG. The full potential was 1.094. I was thinking I should get at least a 1.07 or even 1.06. WTF??
Can anyone tell me what I might try next time to get a better conversion? My only thought might be that I should crack the corn smaller? Would that help me get better results, am I just missing something? Does anyone see any glaring rookie mistakes that would cause the SG to be so low? Any and all ideas/ help would be greatly appreciated.
A few extra items:
- I added the two enzymes at rate of 0.36 ml per pound of grain
- The PH of the water before the boil was 7.1
- The texture of the corn after all the time it was heated and left in the insulated box wasn’t as soft as I would have expected but is was still not hard by any means.
Thanks for any help with this, it is very frustrating to say the least.