[quote=“560sdl”]So I am finally getting my AG processes dialed in. After a move it took a while to get things the way I wanted them and to re-invent my processes. Next major thing is water chemistry, but that is for another day.
So the last two batches were my first all grain lagers. I did an Octoberfest on Friday and a Czech Pilsner last night. Both of them ended up 4-6 points higher than my estimated Starting Gravity after plugging my recipes into BeerSmith. It is a little weird because my pre-boil gravity was maybe a point high.
I am starting and ending up with proper volumes, really dead on. Boil time is 60-75 minutes, but I plug that in.
I am not sure how to adjust going forward. I really would not change my brewhouse efficiency unless I was missing my pre-boil gravity, right?[/quote]
if your post boil gravity was higher than expected, while still accounting for higher efficiency, i think the measurement error is because of one of two things: post-boil volume or pre-boil SG.
I don’t use beersmith…does it give you a preboil efficiency? I measure mine, but only because I’m interested in knowing that i’m getting ball-park levels of sugar out of the process but it is not something I really care about. My main concern is for post-boil SG so I have a starting point for may yeast.
For most of us, it’s really hard to get an exact post-boil volume measurement too. unless you measure the amout of wort going into your fermenter, quart by quart with zero crude transfer, you’re going to have some error due to the volume of crude that also transfers to to fermenter. Just having a line on the fermentor at 5 gallons, doesn’t tell you the wort amount but wort plus crude, and crude volume changes with every recipe.
I think most software is set for 75% efficiency. I routinely get 85-90% efficiency, so that means I have two options to get my OGs/FGs down to closer to the expect value. Either add water or cut back on grain. Adding water (like we did with extract) is easier.
Bottom line: great efficiency is a blessing, not a curse.