So, I chilled down to high 70s (ambient temperature where the smack pack was sitting for 3 days), aerated the hell out of it (used one of those hose-tip aerator thingies, then shaked the hell out of it). 24 hours later, and the wort is clear as day, no sign of foam or airlock activity. I read Revvy's tip on the sticky, about shaking the wort a bit, stirring the trub, and 10 minutes later the top was bubbly - in 2 hours it got a nice 1/2 inch krausen.
This was a 7-month old pack (that refused to inflate on the first day, forcing me to pitch dry yeast on that batch, and then 2 days later was round as a balloon, so I made another batch just for it), so some delay was expected... but I wonder - is it possible that the yeast just flocculated right down when pitched, and then got buried under the trub (especially since it was already active on the pack for 3 days, which is normally when it starts floccing)? That could account for some differences people report when pitching liquid vs. dry yeast - dry yeast (esp. sprinkled directly) seems to take a while floating and dissolving, enough for the trub to settle down first. If the liquid yeast is already ready to flocculate, maybe it'd go down right away, and be buried under the trub.
Maybe if direct-pitching liquid (without a starter, for whatever reason) it's a good idea to wait a few minutes for the trub to set in the fermenter before pitching? I guess 15 minutes without pitching beats 24 hours without fermentation... Or maybe give it a vigorous stir at 1-2 hours after pitching?
This was a 7-month old pack (that refused to inflate on the first day, forcing me to pitch dry yeast on that batch, and then 2 days later was round as a balloon, so I made another batch just for it), so some delay was expected... but I wonder - is it possible that the yeast just flocculated right down when pitched, and then got buried under the trub (especially since it was already active on the pack for 3 days, which is normally when it starts floccing)? That could account for some differences people report when pitching liquid vs. dry yeast - dry yeast (esp. sprinkled directly) seems to take a while floating and dissolving, enough for the trub to settle down first. If the liquid yeast is already ready to flocculate, maybe it'd go down right away, and be buried under the trub.
Maybe if direct-pitching liquid (without a starter, for whatever reason) it's a good idea to wait a few minutes for the trub to set in the fermenter before pitching? I guess 15 minutes without pitching beats 24 hours without fermentation... Or maybe give it a vigorous stir at 1-2 hours after pitching?