Beer Forum

When I enter Tasty's recipe into beersmith I'm coming up with 52.4 IBUs instead of the 63 in his recipe. I'm set for the Raegar IBU calc. The only thing I changed was boil size, upped to 7.5 gal to leave 6 gal at the end of the boil. Any ideas why the IBUs are off for beersmith? Should I up the bitterness to reach Tasty's numbers? Thanks.

Here's the recipe i entered into beersmith:
Batch Size (Gal): 6.00 Wort Size (Gal): 6.00
Total Grain (Lbs): 16.00
Anticipated OG: 1.066 Plato: 16.20
Anticipated SRM: 19.3
Anticipated IBU: 63.2
Brewhouse Efficiency: 70 %
Wort Boil Time: 90 Minutes

Grain/Extract/Sugar

% Amount Name Origin Potential SRM
-----------------------------------------------------------------------------
75.0 12.00 lbs. Pale Malt(2-row) America 1.036 2
7.8 1.25 lbs. Cara-Pils Dextrine Malt 1.033 2
7.8 1.25 lbs. Crystal 40L America 1.034 40
6.3 1.00 lbs. Wheat Malt America 1.038 2
3.1 0.50 lbs. Chocolate Malt America 1.029 350

Hops

Amount Name Form Alpha IBU Boil Time
-----------------------------------------------------------------------------
1.00 oz. Northern Brewer Pellet 6.50 19.0 Mash H
1.25 oz. Northern Brewer Pellet 6.50 30.8 60 min.
1.00 oz. Northern Brewer Pellet 6.50 6.6 15 min.
1.50 oz. Cascade Pellet 6.00 6.8 10 min.
1.50 oz. Cascade Pellet 6.00 0.0 0 min.
2.00 oz. Centennial Pellet 9.00 0.0 Dry Hop

Yeast
-----
White Labs WLP001 California Ale Yeast

Mash Schedule
-------------
Saccharification Rest Temp : 154 Time: 30
Mash-out Rest Temp : 165 Time: 15
Sparge Temp : 170 Time: 45

The difference is because Promash and Beersmith calculate the IBU contribution from mash hopping differently. I haven't found any science that would tell me which one is correct. In fact, some say that no IBUs carry over from the mash hop through the boil. I wouldn't change the recipe, just make a 52.4 Beersmith-IBU beer. Then enjoy.

It is an awesome recipe dude, you will love it!

I am actually making that beer as we speak! Waiting for the mash to complete.

Bruck wrote:I am actually making that beer as we speak! Waiting for the mash to complete.

Very cool.

Can't wait to taste it!

Thanks Tasty. I thought it might be something like that. Made the extract version from BCS about a year ago. Great recipe! Can't wait to try the all grain version.

It is an awesome recipe dude, you will love it!

Next to be brewed, looking forward to it.
Thanks to Tasty