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Efficiency fix

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sharpe1987
beers 8 º 06:08 Wed 10/31/2012

1) Can I determine how much my efficiency is off by figuring out how much I miss my starting gravity by? I.e. Intended SG: 1.040 Actual SG: 1.030 Efficieny 25% lower than I thought?

2) If I have figured out that my efficiency is 13% below what I previously thought (, do I make up for this by adding 13% more base malt or distribute the 13% out equally amongst all the malts in the grain bill?

Cheers

 
FlacoAlto
premium
beers 3881 º places 17 º 06:58 Wed 10/31/2012

1.) yes that should be correct

2.) it is not quite that simple, you need to multiple the original amount of grain by your first estimated efficiency & then divide by your actual efficiency. For your example in 1) above, this would meen you need 33% more malt to get the gravity you wanted if your O.G. was off by 25%.

 
HornyDevil
07:08 Wed 10/31/2012

IMO, if you determine that your efficiency is poor you should try to figure out what is causing it to be that way. Sometimes a small change in technique (finer grind to your grist, increased sparge time, different sparge technique) can lead to a significant increase in efficiency.

 
JulienHuxley
premium
beers 4318 º places 347 º 07:59 Wed 10/31/2012

For my first two all-grain batches I have gotten decent efficiency up in the 80% range but really got bad efficiency on my last batch that had 55% wheat malt in it which resulted in my wort being 11 pts under what was expected (1.044 instead of 1.055). After reviewing my process, and reading on the different forums, I found out that even if I adjusted my mill to a finer grind, it was still probably too coarse for the wheat malt. I was worried about getting a stuck mash, but I will grind it finer next time.

 
harrisoni
premium
beers 15314 º places 27 º 04:58 Mon 11/5/2012

Efficiency is currently my biggest problem. Iíve only done one all grain so getting my mash technique right is an issue. Iíve been using a mash bag in the past when I was doing partial grain but I guess now I need to do away with the bag and just mix the grain and brewing liquor together, do the mash and then strain out the wort somehow?

 
Unclerudy
beers 12 º places 3 º 05:55 Mon 11/5/2012

Just get a 10 gallon igloo cooler to mash in. SOmething like 35 bucks at Home Depot. And buy a bazooka tube for another 35. Mash problem solved.

 
harrisoni
premium
beers 15314 º places 27 º 07:01 Mon 11/5/2012

Originally posted by Unclerudy
Just get a 10 gallon igloo cooler to mash in. SOmething like 35 bucks at Home Depot. And buy a bazooka tube for another 35. Mash problem solved.


Sorry I live in that small province called the UK, so donít have access to a Home Depot, but I guess I know what you mean.

However, what is a bazooka tube?

 
Bilk
beers 16 º places 3 º 17:15 Mon 11/5/2012

I googled it, apparently itís a car stereo subwoofer.

 
bitbucket
beers 2160 º places 63 º 20:33 Mon 11/5/2012

Originally posted by harrisoni
Originally posted by Unclerudy
Just get a 10 gallon igloo cooler to mash in. SOmething like 35 bucks at Home Depot. And buy a bazooka tube for another 35. Mash problem solved.


Sorry I live in that small province called the UK, so donít have access to a Home Depot, but I guess I know what you mean.

However, what is a bazooka tube?

An alternative to a false bottom. These guys are building their own:

 
bitbucket
beers 2160 º places 63 º 20:37 Mon 11/5/2012

Originally posted by sharpe1987
If I have figured out that my efficiency is 13% below what I previously thought (, do I make up for this by adding 13% more base malt or distribute the 13% out equally amongst all the malts in the grain bill?

Cheers

Various bits of software will help you figure this out.
Hereís one free option:
http://beercalculus.hopville.com/recipe

 
Erlangernick
beers 1 º places 2 º 03:17 Tue 11/6/2012

Originally posted by Bilk
I googled it, apparently itís a car stereo subwoofer.


Heh. Had one of those back in the 80ís. Now, Iíve got the brewing kind.

Ian, I canít recommend a 10-gal (US) Rubbermaid cylindrical cooler highly enough. Yes, itís bloody expensive, but itís a *great* mash tun. And large enough to enable you to do sparge-free mashing like I do (ca. 80% efficiency with Weyermann PA Malz...without sparging). And my beer turns out fucking great.

Speaking of which, batch 124 today shall be a black half-IPA of ~1.036 OG and 100+ IBU. (0 ITwigU.)

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