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Old 08-20-2007, 05:50 PM   #1
crowsmith8
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Default 85% PM efficancy - no good?

So last time I brewed I got about a 60% efficancy, so this time I decided to overcompensate. I added a little bit extra grain to the bill. After brewing it looks like I got an 85% efficancy. I'm pysched, but with my over compensation of grain and increased efficancy my OG is a lot higher than I would have liked (was shooting for about 1.052 and got 1.063). This could have been avoided had I just not added as much DME. So my question is after mashing and sparging how can I determing what the OG is going to be. I know that I can take a reading and adjust for the temp, but my wort collection is only 3 gallons (pot size), so how can I calculate what my OG will be after I add 2.5 gallons of water for a total of 5.5 gallons?

My second qustion, how do I deteremine how much DME to add at that point in time? I guess I'm asking how do I know what each lb. of DME will add to the OG of 5.5 gallons? Thanks.

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Old 08-20-2007, 06:18 PM   #2
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ProMash will be able to give you all these calcs. That's what I use. Even if you don't feel like paying the $25 for the registered version, you can still get the calcs from the trial version (it doesn't "expire", you just can only save a limited number of recipes). I'm sure there are some rather complex calcs you could do, but if you just download the trial of ProMash, that should do it for you.

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Old 08-20-2007, 06:21 PM   #3
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Target gravity points = target volume x target OG (5.5 gal x 52 = 286)
Actual PM gravity points = collected volume x PM gravity (3.0 gal x 50 = 150)
Gravity points needed from DME = target - collected (286 - 150 = 136)
DME needed = "missing" points / 46 (136 / 46 = 3 lbs)

I just made up the 1.050 OG for you PM...plug whatever number you really get in there. And your DME should be somewhere in the range of 45-46 pts/lb/gal...I just used 46.

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Old 08-20-2007, 06:44 PM   #4
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I'll probably get some brewing software one of these days, but I'm a very math oriented type of guy so I like to be able to do the calculations myself. Thanks Bike N Brew for coming through again with the calculations.

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Old 08-20-2007, 08:27 PM   #5
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Just out of curiosity, what did you do differently to get your efficiency higher? I would like to get my efficiency a little higher for my PMs also.

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Old 08-20-2007, 09:13 PM   #6
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I did a few things differently. One is that I mashed out for the last 10 min of a 60 min mash. Also, instead of doing a two batch sparges I only did one and I let it sit for 10 mins before collecting the wort. Before I did two batches with only letting it sit for 5 mins each before collecting. And even though I was using the same mash tun I seemed to hold my mash temp better, why that is I don't know.

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Old 08-21-2007, 02:04 AM   #7
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For the mashout what temp was your infusion? I've seen some do boiling and some do lower.

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Old 08-21-2007, 07:35 PM   #8
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I added boiling. I had 6.75lbs of grain with 1.25 quarts per lb for the mash. I held the mash at 155*. Then I added 1.5 quarts boiling for mash out.

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