. . . jees a couple more points would be nice.
So I've done about 9 x 40L Crown Urn BIAB brews and my mash efficiency has been in the shitter (but constant) @ 51-52%. Currently using about 5.4kgs of grain to generate 17L of wort (excluding 2L loss to trub). Relevant information:
1. I have used both an old CB BIAB bag and swiss voile;
2. Generally mash in at anywhere between 65 -67 dpeending on the brew. Mash for 60mins and generally loose about 1.5 degrees over that time (even though the urn is insulated with comressed foam and lagged with a doona) so most times I give it a blast at 30mins to get maintain the temp.
3. Pen thermometer has been calibrated and is accurate to 0.5 degree.
4. I buy my grain milled from the Daves HBS in Sydney. It's a middle of the road mill ie not superfine or super coarse.
5. I don't sparge.
6. I've tried a mashout and it didn't make a lot of difference (couple of %).
7. I check my pre-boil SG and reconcile this with the post-boil no chilled wort prior to pitching.
8. Never done a starch conversion test.
Buggered if i know what's going on. I'd like to increase the brew size or brew some higher SG brews, but with the current efficiency and quantity of grain, I'd need upward of 6+kg of grain - try pulling that bag by yourself one handed.
I understand that i should conservatively be getting anywhere from 60-70% without a sparge or mashout.
Any suggestions on how I might analyse or fix this would be greatly appreciated.
Cheers
So I've done about 9 x 40L Crown Urn BIAB brews and my mash efficiency has been in the shitter (but constant) @ 51-52%. Currently using about 5.4kgs of grain to generate 17L of wort (excluding 2L loss to trub). Relevant information:
1. I have used both an old CB BIAB bag and swiss voile;
2. Generally mash in at anywhere between 65 -67 dpeending on the brew. Mash for 60mins and generally loose about 1.5 degrees over that time (even though the urn is insulated with comressed foam and lagged with a doona) so most times I give it a blast at 30mins to get maintain the temp.
3. Pen thermometer has been calibrated and is accurate to 0.5 degree.
4. I buy my grain milled from the Daves HBS in Sydney. It's a middle of the road mill ie not superfine or super coarse.
5. I don't sparge.
6. I've tried a mashout and it didn't make a lot of difference (couple of %).
7. I check my pre-boil SG and reconcile this with the post-boil no chilled wort prior to pitching.
8. Never done a starch conversion test.
Buggered if i know what's going on. I'd like to increase the brew size or brew some higher SG brews, but with the current efficiency and quantity of grain, I'd need upward of 6+kg of grain - try pulling that bag by yourself one handed.
I understand that i should conservatively be getting anywhere from 60-70% without a sparge or mashout.
Any suggestions on how I might analyse or fix this would be greatly appreciated.
Cheers