Can you ferment too fast? M54 yeast

The Homebrew Forum

Help Support The Homebrew Forum:

sifty

Regular.
Joined
Mar 28, 2021
Messages
337
Reaction score
336
Location
New Zealand
I brewed a version of a Svagdricka (Swedish light beer, literally 'weak drink') on Friday, as an exercise to see if I could do a lower ABV beer that wasn't watery. (most of mine come in 6-7% so was aiming for around 3.3%).

3.5kg grain bill, based on the Chop and Brew recipe online, and 23 litre batch. I thought I'd try mashing at 68.5 degs to see if that reduced fermentable sugars yet added body.

Anyway, I tried Mangrove Jacks M54 yeast for the first time (2 pkts hydrated) and it took off like a rocket at 19 degs. Seems all done in 48hrs (sunday lunchtime now). Is this legit?

OG came in high (as usual) at 1.039 but not too worried, I just wanted something between 3-4% that was drinkable.
20220626_151640.jpg


20220626_151700.jpg
 
Last edited:

sifty

Regular.
Joined
Mar 28, 2021
Messages
337
Reaction score
336
Location
New Zealand
I'm wondering if it is the low OG, or the different yeast that caused this. Seems unnecessarily rapid. I'll leave it a week to clean itself up but curious. If it tastes ok I'll be able to knock out a seasonable mild in no time... 🙂

Brew not without it's errors. Spilled some grain while milling (lost 20g base, no biggy) and didn't have enough Hallertau so used my own Fuggle I had in the freezer. I used a Dark Mild profile so it should be drinkable.

Anyone used M54 before? It's supposedly a Californian lager yeast you can brew at Ale temps...?
 
Last edited:

Nicks90

Landlord.
Joined
Jul 5, 2017
Messages
1,389
Reaction score
979
Location
West Yorks
Can I ask why you used 2 packets of yeast for a room temperature 5 gallon brew? One packet would have been enough and possibly why it went bonkers with such a large dosing.
 

sifty

Regular.
Joined
Mar 28, 2021
Messages
337
Reaction score
336
Location
New Zealand
Habit, probably. :D
Plus that's what Brewfather software recommended. Won't do it again if I redo this one.
 
Joined
Apr 17, 2020
Messages
1,019
Reaction score
2,499
I've used MJ54 a few times for Cali Commons and Steam Pilseners.
Always used 1 pack with no problems but then I do 18L batches, they advise 2 for anything with a high OG that might stress the yeast or batches over 23L.
As I remember they recommend 2 x packs for OG over 1.050.
Sure it'll be fine but save yourself some money next time !
 

sifty

Regular.
Joined
Mar 28, 2021
Messages
337
Reaction score
336
Location
New Zealand
Thanks for that.
Is it a good yeast for the style? (Cali common). I've not done one of those yet... 🙂
 

An Ankoù

Landlord.
Joined
Feb 2, 2019
Messages
6,819
Reaction score
5,729
Location
Brittany, France
I've never used that yeast although I have some in the fridge for when I make a pseudo lager. In 50+ years of brewing, I've never used 2 sachets of yeast. It's a con. A rehydrate sachet is enough for 20 litres and more, then use the slurry. With lagers, I tend to make a 10 - 12 litre batch with one rehydrate sachet and then use the slurry in a big batch.
It is possible to ferment too fast, but I'm not sure why it happens. Sometimes when it's too hot, the contents of the fermenter will appear to boil. I don't mean that the bits are moving up and down in the liquid at a scary rate, but the whole liquid moves as if it's on a strong, rolling boil. The beer's useless after that. I've only had it happen twice when I was young and foolish.
Yours sounds alright.
 
Joined
Jan 27, 2020
Messages
9,323
Reaction score
17,189
Location
Maidstone, Kent
In the normal course of events the yeast takes a few hours to build up it’s army but if you pitch lots of yeast in the first place it needs less time and quickly builds a strong fighting force.

I’d still give it another week to clean up though, it’ll be carnage in there! 😂
 
Joined
Apr 17, 2020
Messages
1,019
Reaction score
2,499
Thanks for that.
Is it a good yeast for the style? (Cali common). I've not done one of those yet... 🙂

I scaled the recipe from a Jon Finch one on the Malt Miller website, brewed it twice and turned out nice
both times. Copy here if you're interested


 

Cestrian

Regular.
Joined
Apr 18, 2020
Messages
398
Reaction score
387
I’ve used Cal ale yeast a few times over the last few months. Haven’t noticed how lively it is, but I don’t really bother checking sg anymore.
One thing I have noticed is it is difficult to clear.
 

sifty

Regular.
Joined
Mar 28, 2021
Messages
337
Reaction score
336
Location
New Zealand
Thanks everyone.
Looks like simple maths, low OG and lots of yeast. It wasn't an explosive fermentation, just steady bubbling, that started around 6-7 hrs after pitching and ceased after 48hrs.

I'll let it rest a few more days and post results when it's done. An experimental brew really, not sure what to expect...
Cheers... 🙂
 

Latest posts

Top