Secondary Lager Fermentation Slow?

In the past, I only ever did top fermenting styles. I had to depressurise my bottles sometimes even more than once (using swing top bottles, luckily, this is not too awful). Now I made a Vienna Lager and even though I can‘t even really cold crash the bottles (I have them sit outside at maybe 10°C instead due to a lack in fridge space), my secondary fermentation is way slower than I’m used to. Is that to be expected?

With ales, I opened the bottles the day after starting secondary, and it sometimes was a deafening bang already. Now, I waited maybe even two days and haven‘t got more than a shy little pop.

I used powdered sugar (mixed with sterile water 1:1) to feed the yeast in secondary fermentation because I didn‘t have anything else in the house when I found the time to bottle. Is that maybe an issue?

Aarkon OP ,

A glass of beer, copper-ish brown/red

This is what we’ve got. I have no experience regarding what the style is supposed to be like, but it’s a really great beer with a fine balance between sweet and bitter components, excellent full mouthfeel and a decent amount of carbonation. It’s somewhat close to a Märzen, with a little less body I’d say. All in all, not too shabby for my first lager ever and the less ideal temperatures. W34/70 lives up to its reputation.

The head collapses quite quickly, which makes the beer go stale rather quickly as well, but it mostly doesn’t live long enough once I have it in my glass anyway. 🤤

drre ,

do you have an update on how secondary is coming along?

Aarkon OP ,

I left the bottles alone, zero blasts so far. I already had to try one out of curiosity just recently, and it was mildly carbonated but went stale pretty quickly and had very little head retention. So it seems to me that letting them sit for another week or so is the way to go.

drre ,

thanks for the update!

Aarkon OP ,

Will come back with a picture once there's something I can show off with ;)

drre ,

how much sugar ended up per bottle? my book says 6.5g/l for a light lager during secondary. also what are your temps?

Aarkon OP ,

That’s about it, 6 g/l. I ferment in my garage and the highest it went in primary was close to 20 degrees, just before it was done (nice coincidence that it did a diacetyl rest that way). When bottling last Tuesday, it was more like 10, and it’s somewhere in that ballpark since then, warming up slightly the last few days.

drre ,

my guess then it just needs more time. as another commenter said it, likely around two weeks, perhaps 3?

checked my book: it says 4 weeks at 3°C, so maybe 1-2 weeks at 10 degrees. I'd just open a bottle after like 10 days to see where it's at.

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