Originally Posted by jammin
If you got 1.082 out of 6.3kg (13.86lbs) with a 20L (5.3g) batch size; you had ~ 86% brew house efficiency. I wouldn't quite say your efficiency is "suffering" lol.
I only got 17l (4.5g) into the fermentor on that brew and Brewmate calculates a 70% brewhouse efficiency.
Seems lika as soon as you go over 5kg (11lbs) grain in a recipe, your effiency starts dropping down to the lower 70s.
I think I just might go for it and fill the 50l maltpipe with 10kg (22lbs) of grain to make a mark on where to cut it, and then go wild with the grinder. Don't think the lap at the top of the pipe is that necessary? Just have to make new lifting bolts by drilling holes and using threaded rod and nuts to create new ones. And of course a longer distance sleeve is needed.