Maybe I'm a bit cheap, but I typically buy one pure pitch packet of liquid yeast for a batch of 55-60 liters ale (14-15 gallons). I will buy two packets of liquid yeast for lagers. In Norway a packet of pure pitch yeast is about $12-15.
There is no way I will be able to make a starter from 1 packet of liquid yeast large enough for bath of 55-60 liters ale in one go. What I will do is make a regular starter using a 3 liter erlenmeyer flask and a stir plate. This starter will easily be large enough for a 20 liter bath (5 gallons).
I will then have a regular brew day and brew my 55-60 liters of wort (typical OG 1060 +/- 5). I will then pour 10 liters of wort into each of the two fermentation vessels (buckets or fermentasauruses [fermentasauri
] ), total of 20 liters. I will oxygenate the wort and pitch the yeast starter (half in each of cause). The remaining 35 - 40 liters of wort I store refrigerated.
After 48 hours the yeast has produced a good krausen. If the yeast is doing well I will boil and chill the remaining wort, oxygenate and pour half into each fermentation vessel. And then ferment as usual.
For me this is an easy and quite obvious way to do this, but I can't find any references to this method on the web nor in the literature. I have found that when doing high gravity beers a similar method is described.
Is there any reason why this method should produce a lower quality beer, or any reason not to use this method?