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-   -   Low attenuation please help! (http://www.homebrewtalk.com/f163/low-attenuation-please-help-222644/)

andyveedub 02-03-2011 03:02 PM

Low attenuation please help!
 
I've been brewing for a couple months and had most of my beers turn out well. For some reason the last few batches have been finishing at 1.020 ish. I'm really racking my brain to figure this thing out. I have 3 thermometers that I use to ensure my mash temps arent too high. for darker beers I've been mashing at 154 to get a little fuller body. My IPA's though, I mash at 152, follow mr. malty to pitch an appropriate sized starter, my sanitation is excellent. I use yeast nutrient. And on tuesday night I got a stir plate and made a starter per mr. malty for a beer that will be somewhere in the 1.066 range. I made the starter which was calculated on a stir plate to be 1.05L. when I put the wort into the flask it measured more like 700ml. I have never measured my starter wort volume before pitching. so its possible that I've under pitched my last few batches. Just for an experiment though I checked the gravity of the starter after 24hrs on the stir plate and my gravity at 60 degrees was only 1.016. How come I cant get better attenuation? BTW I'm using WLP001. After I stuck the flask in the fridge overnight this is the size of the cake I got. Looks sort of small to me. Or is that a proper amount? It doesnt look like much more yeast than the vile...? The OG of the starter was 1.040.http://i2.photobucket.com/albums/y32...b/IMG_0461.jpg

Clonefarmer 02-03-2011 03:40 PM

What's the OG of your starters?

Are you extract brewing?

dinertime 02-03-2011 03:54 PM

Are you oxygenating? What is the grain bill--are you using a lot of specialty malts (Crystal, etc...)?

andyveedub 02-03-2011 04:04 PM

All grain only. I've been going by the general 100grams of DME per liter of water. I dont use any oxygenation equipment but I cap the carboy and shake it and roll it on the floor for 10 minutes. the grain bill on the IPA was as follows with WLP001 yeast:

11.5# 2 row
1.25# crystal 10
1# carapils
.5# caravienne

Clonefarmer 02-03-2011 04:13 PM

Quote:

Originally Posted by andyveedub (Post 2611168)
All grain only. I've been going by the general 100grams of DME per liter of water. I dont use any oxygenation equipment but I cap the carboy and shake it and roll it on the floor for 10 minutes. the grain bill on the IPA was as follows with WLP001 yeast:

11.5# 2 row
1.25# crystal 10
1# carapils
.5# caravienne

It could be the amount of specialty grains.

sjbeerman 02-03-2011 04:46 PM

20% specialty grains does seem to be a bit on the high side...What were the OGs and FGs?

andyveedub 02-03-2011 05:08 PM

OG was 1.067 FG was 1.020. so only 70% attenuation. I'd like to see at least 75% with WLP001.

dinertime 02-03-2011 05:24 PM

I dunno, with 20% specialty grains that's not totally out of the ballpark. It would make a bit more sense if they were darker, like crystal 60 or something, but you could still have a bunch of dextrine in there.

Quote:

Originally Posted by andyveedub (Post 2611168)
I dont use any oxygenation equipment but I cap the carboy and shake it and roll it on the floor for 10 minutes.

Also, I don't think your aeration method is actually introducing any extra oxygen into the wort because the carboy is capped. You are only mixing up what air is already in there, which is the same amount of oxygen as if you had just pitched and put on the airlock. What does anyone else think about that?

Beer_Guy 02-03-2011 05:54 PM

I spent a few buck for an Aquarium pump and cheap air stone. My brews have turned out a lot better since then. Just clean the stone good before and after. I soak mine in Starsan for 12 hours after I use it, let it dry good and store it in a sealed container.

I also had to get an inline air valve because the bubbles kept coming out the top of my fermenter. I run it for 15 minutes. Works great for me.

andyveedub 02-03-2011 06:18 PM

what kind of aquarium pump? like from the local pet store?


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