Ss Brewing Technologies Giveaway!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Why is my effeciency getting worse?
Reply
 
LinkBack Thread Tools
Old 04-04-2009, 07:21 PM   #1
jacksonbrown
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Location: Madison, WI
Posts: 1,184
Liked 6 Times on 6 Posts

Default Why is my effeciency getting worse?

When I first built my MLT cooler I was getting 85%-92% efficiency from my first five batches. Then it started dropping to the mid 70's. now I feel lucky if I hit 65%. My method hasn't changed. I've been using different base malts in different batches, so I can't see it being a single malt causing it. What in the world can be causing such a drastic drop over time the past 9 months?

__________________
Barefoot Brewery

Primary: German Alt
Bottled: Kolch, German Hefeweizen
On tap: 60/- Light Scottish Ale
jacksonbrown is offline
 
Reply With Quote Quick reply to this message
Old 04-04-2009, 07:38 PM   #2
k1v1116
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Posts: 971
Liked 3 Times on 3 Posts

Default

grain crush is the first thing to check. Its possible your mill or the HBS mill is not tightened and the gap has been steadily increasing.

__________________
k1v1116 is offline
 
Reply With Quote Quick reply to this message
Old 04-04-2009, 07:41 PM   #3
lamarguy
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2008
Location: Austin, TX
Posts: 1,657
Liked 20 Times on 20 Posts
Likes Given: 1

Default

Does your thermometer need recalibrating? Mash temperature is critical. Are you tasting the spent grains to see if there are residual sugars not being rinsed well?

Have you checked the mash pH lately? Mash pH is critical and will change with city water fluctuations and different base malts.

Are you brewing bigger beers than in the past? If you're batch sparging, higher gravity translates to lower efficiency.

Has your crush changed? You may want to check the gap on your mill.

Just some things to check...

__________________
Doggfather Brewery

Planned: Lambic, American IPA
Fermenting: 6 gals of 1.090 stout (Belgian) & 6 gals of 1.090 stout (English)
Tapped: Berliner Weisse, Black English IPA, German Pils, & Live Oak Primus
lamarguy is offline
 
Reply With Quote Quick reply to this message
Old 04-04-2009, 08:13 PM   #4
jacksonbrown
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Location: Madison, WI
Posts: 1,184
Liked 6 Times on 6 Posts

Default

I check my mill every 4-5 brews to keep it consistent. I checked my thermometer today and it's still good (well, off by 2 deg which I already knew). I have not been checking my pH, but I 5.2, so I didn't think it was needed. I guess I can do that next time. I have brewed bigger beers, but I've also been doing standards (1.045-1.060). I guess it could be the city water. Although, I did make a batch with store bought spring water, and it was the same result. So, I don't know.

__________________
Barefoot Brewery

Primary: German Alt
Bottled: Kolch, German Hefeweizen
On tap: 60/- Light Scottish Ale
jacksonbrown is offline
 
Reply With Quote Quick reply to this message
Old 04-04-2009, 08:28 PM   #5
BarleyWater
Feedback Score: 0 reviews
 
BarleyWater's Avatar
Recipes 
 
Join Date: Jan 2007
Location: Armpit of Dallas (Irving), TX
Posts: 2,211
Liked 20 Times on 16 Posts
Likes Given: 1

Default

What are you using for your MLT, and could it be possible that it is losing heat somewhere now that it wasn't before due to age and wear? If you mash temp is falling a lot throughout the mash, you could be missing out on some conversion.

__________________

Fermenting: Nada
On Tap:Cran Wit, Dr Pepper Dubbel, Cascadian Pale Ale, Dark Chocolate Stout, Imperial Stout, Brown Mild, Schwarzbier
On Board: IIPA


www.franconiabrewing.com
BarleyWater is offline
 
Reply With Quote Quick reply to this message
Old 04-04-2009, 08:33 PM   #6
jacksonbrown
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Location: Madison, WI
Posts: 1,184
Liked 6 Times on 6 Posts

Default

It dropped 2 deg today from start to finish.

__________________
Barefoot Brewery

Primary: German Alt
Bottled: Kolch, German Hefeweizen
On tap: 60/- Light Scottish Ale
jacksonbrown is offline
 
Reply With Quote Quick reply to this message
Old 12-12-2009, 01:27 AM   #7
bohdan987
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Pystomutu, Ukraine
Posts: 199
Liked 1 Times on 1 Posts
Likes Given: 1

Default

its a beat up grain mill, i am having same problem with a brew store mill! do you have own mill or you use store mill?
if you have your own mill, tune it up.
if you using a store mill, dont crush or buy grain from there(thats what iam doing)!
if store cant keep their grain mill in a desent shape, they should be in a buisnes.

__________________

T.O.P
Brewery

bohdan987 is offline
 
Reply With Quote Quick reply to this message
Old 12-12-2009, 02:10 PM   #8
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,651
Liked 134 Times on 127 Posts

Default

Even though you've been checking your mill, I'd try reducing the gap for the next run. The running gap and the static gap may not be the same.

__________________

Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

david_42 is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Maximum Brew-in-a-bag effeciency bakins All Grain & Partial Mash Brewing 32 09-10-2010 01:30 PM
Dumb effeciency question. oldschool All Grain & Partial Mash Brewing 7 09-16-2009 12:57 AM
how do I calculate my effeciency iasquith All Grain & Partial Mash Brewing 12 02-20-2008 05:13 PM
nice effeciency hjherbenson All Grain & Partial Mash Brewing 1 12-12-2007 11:09 PM
mash effeciency subwyking All Grain & Partial Mash Brewing 13 01-20-2006 05:40 PM