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Q-talk *ON TOPIC ONLY* QUALITY ON TOPIC discussion of Backyard BBQ, grilling, Equipment and just outdoor cookin' in general, hints, tips, tricks & techniques, success, failures... but stay on topic. And watch for that hijacking.


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Unread 11-12-2012, 01:41 PM   #10291
krshome
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Quote:
Originally Posted by Rmhardie View Post
I used the Permatex Red Hi Temp red RTV sealant to mod my UDS to add a domed lid and seal up around the air intakes at the bottom. On the first trial run, I built a small fire to test the temp performance, etc. I noticed a chemical type smell coming through the exhaust vents. I've seen plenty of posts using this product and would assume that if its not safe for a UDS, that would be well documented here. However, I'm really concerned about off gassing during the cook. I don't want my guests getting ill from my modded rig! Any input would be appreciated
I pulled this from another post here on the BBQB: The Permetex site said this:
" When heated to temperatures above 300 degrees F. in the presence of air, this product can form formaldehyde vapors. Formaldehyde is a potential cancer hazard and a known skin and respiratorysensitizer. Safe handling conditions may be maintained by keeping vapor concentrations below the OSHA permissible limit for formaldehyde"
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Unread 11-12-2012, 03:23 PM   #10292
ed.
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Job well done.
Thank Doc, this forum is insane.
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Unread 11-12-2012, 03:47 PM   #10293
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Blokes. I've build my UDS and have done a few good smokes in it. Couple of questions that I have for the more experienced:

1. My lid (dome weber) isn't airtight. It's not too bad, but there is airflow there. How important is a seal on the lid to maintaining temp? Mine seems to hold a steady temp ok - do I need to make sure that lid is 100% airtight? I'm using the normal Weber airflow adjuster in the lid as a chimney.

2. The chimney - or lack of.. would it be better for the smoker to have a proper chimney, rather than the weber opening in the lid? Ie... that would help convection and airflow, no?

3. My firepit has two rings for different charcoal loads - a very large one which sits about 1.5" off the side of the barrel (so around 18-19" in diameter) and a smaller one which sits inside this and is around 10". The 10" ring will take 8-9# of fuel, the large one will take 30#. This happened because the first firebox I built was way too big for the UDS, the coals were too spread out. I've so far used a max of around 8# in my UDS and got a steady 120degC for around 8 hours of burn time. Does this sound about right? I need to get this bit right for planning a long burn - how much fuel do you guys need for a 13 hour butt smoke?

I'll get some pics up soon - thanks for your help here!

Cheers - Mike
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Unread 11-12-2012, 03:57 PM   #10294
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mvzoom, My Weber lid is not perfect either. I found it had smoke billowing out in one spot say 12:00 and at say 6:00, I found a squeeze of the lid fix it. If its your barrel use a aluminum foil as a gasket for the lid. A little air leak shouldn't make to much of a difference on a smoke but will make it hard to shut down. Over time the smoke will seal a lot of the leaks.
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Unread 11-12-2012, 07:15 PM   #10295
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I read this thread front to back loved the idea and everybodies' imput and designs so i took the plunge and built one myself, here is what I ended up with. Doesn't have all the bells and whistles yet...
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File Type: jpg IMG_20121109_132740.jpg (86.4 KB, 650 views)
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Unread 11-12-2012, 09:08 PM   #10296
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Very nice paint Chad
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Unread 11-12-2012, 11:05 PM   #10297
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Quote:
Originally Posted by krshome View Post
mvzoom, My Weber lid is not perfect either. I found it had smoke billowing out in one spot say 12:00 and at say 6:00, I found a squeeze of the lid fix it. If its your barrel use a aluminum foil as a gasket for the lid. A little air leak shouldn't make to much of a difference on a smoke but will make it hard to shut down. Over time the smoke will seal a lot of the leaks.
Yeah thanks - I didnt think it'd make much of a difference assuming the temp was stable and in the range that I wanted.

Any feedback on the fuel quantities?
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Unread 11-13-2012, 03:45 AM   #10298
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Thank Doc, this forum is insane.
We are glad you found us.
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Unread 11-13-2012, 08:53 AM   #10299
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Quote:
Originally Posted by mvzoom View Post
Yeah thanks - I didnt think it'd make much of a difference assuming the temp was stable and in the range that I wanted.

Any feedback on the fuel quantities?
I fill my basket full every smoke (16.6 lb. bag & 3-4 fist size chunks of white oak using the minion method). When I done cooking I close off the intakes and exhaust and snuff it out. Usually within an hour its out. On my next cook I shake the ash out of the basket then reuse what is left. I then add wood chunks and top off with more charcoal or lump. I usually only use 1/4 -1/2 of the fuel for a cook (8-10 hours). I have let it go just to see how long it would last on a full basket and lasted over 24 hours. I have thought about making a smaller basket for things like fish and chicken for faster cooks but I use so little fuel with a big basket I haven't bothered.
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Unread 11-13-2012, 09:38 AM   #10300
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I get the same results. 20# of B & B Lump will burn 24 hrs. 275deg. One cap off of lid with no chimney, one 3/4 open, one 3/4 half closed on the intake
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Unread 11-14-2012, 10:56 AM   #10301
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Quote:
Originally Posted by Just BS View Post
We're gonna need more info.

How did you clean out your drum liner?

Did you burn it out? If so, how long?

Additional build specs too....
Standard uds build. Expanded metal basket 3" off floor, food 24" above that, three 3/4 intakes. I used the RTV to seal a band of steel around the top (on the outside of the band) to attach stove rope to accomodate a domed lid. The other application of the rtv was to seal around the intakes (again, on the outside of the drum). A little of the rtv leaked into the fire chamber around the top of one intake. As far as the liner goes, it was sandblasted out. I've cooked on it with the flat lid prior to the mods.
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Unread 11-14-2012, 06:21 PM   #10302
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Quote:
I fill my basket full every smoke (16.6 lb. bag & 3-4 fist size chunks of white oak using the minion method). When I done cooking I close off the intakes and exhaust and snuff it out. Usually within an hour its out. On my next cook I shake the ash out of the basket then reuse what is left. I then add wood chunks and top off with more charcoal or lump. I usually only use 1/4 -1/2 of the fuel for a cook (8-10 hours). I have let it go just to see how long it would last on a full basket and lasted over 24 hours. I have thought about making a smaller basket for things like fish and chicken for faster cooks but I use so little fuel with a big basket I haven't bothered.
Quote:
Originally Posted by Sizzl View Post
I get the same results. 20# of B & B Lump will burn 24 hrs. 275deg. One cap off of lid with no chimney, one 3/4 open, one 3/4 half closed on the intake
What's the size of your baskets?
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Unread 11-16-2012, 08:51 AM   #10303
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Quote:
Originally Posted by FORY View Post
What's the size of your baskets?
I'd be curious as to know as well. I've seen people use the charcoal grate out of a 18" Weber or a 22.5" Weber. That's a pretty big size difference.

Mine is 13.5" in diameter and works fine.
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Unread 11-16-2012, 09:51 AM   #10304
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Starting my first UDS build today. Assuming it turns out I may not have to lug the JOS to all the comps. I have never had a smoker without a water pan. Should I not bother putting a water pan in the UDS?
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Unread 11-16-2012, 10:20 AM   #10305
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Don't bother with the water pan. If you use the minion method to light the coals, they'll never get hot enough to worry about over temperature.

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