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Old 04-22-2014, 12:48 PM   #1
DanB
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Default Fire Bricks/COS

Hi All I picked up 6 fire bricks for my COS, now where is the best place to put them. I'm just trying to even out the temps side to side and hold some heat in.
1.In the firebox?
2.In the cooking pit?

Thanks Dan
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Old 04-22-2014, 12:57 PM   #2
SmittyJonz
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For your Brinkman smoke n Pit? Have you tried tuning plates?
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Old 04-22-2014, 01:11 PM   #3
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Default Plates

Hi Do have 3 tuning plates, but there are very thin metal. The 1st plate is also the baffle.
I did ask around about getting 1/4" plates cut to size, but the cost was way too high.
I think $50.00 was the cheapest I got.
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Old 04-22-2014, 04:29 PM   #4
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Lay them in the bottom under the plates to increase the thermal mass.
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Old 04-22-2014, 06:41 PM   #5
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As far as your question goes, like Blu said, put them under the plates. Have you tried pulling one of those tuning plates out and actually "tuning" them to see what happens? The air gaps between the plates needs to get wider the farther you get from the firebox. You have them evenly spaced across there.
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Old 04-23-2014, 08:36 AM   #6
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Default plates

I've moved around the plates some, with little change, in temps getting evener
From the end of pit/right side there is about a 12" opening, but the temps there are low.
Would heavier plates solve the temp problem?
Thanks Dan
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Old 04-23-2014, 09:01 AM   #7
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Quote:
Originally Posted by Bludawg View Post
Lay them in the bottom under the plates to increase the thermal mass.
Thermal mass won't help if the temps are uneven. The brick closest to the firebox will get hotter than the brick furthest from it. Uneven temps is an airflow problem, not a thermal mass problem. Thicker plates won't matter either.

Tuning the tuning plates is the way to go. You need to get more of the hot air to make it to the far side before rising up to go out the chimney.

It might also help to drop the chimney intake to the cooking grate if possible. Depending on how tall the chimney is, you might need a taller chimney too to promote better draft.
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Old 04-23-2014, 12:23 PM   #8
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Default plates

Hi My smoke stack does come down to grate level.
I have tried to close the gaps with the plates and left the side away form firebox open, still got way too much different temps.
Next time I'm going to wrapped the charcoal grate that I don't use, with foil and put some smaller holes next to firebox side and bigger holes as I get away from the firebox.
Thanks Dan
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Old 04-23-2014, 01:25 PM   #9
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You're thinking about things all wrong. You're running tuning plates: get rid of the exhaust extension and your tuning plates will work! You're keeping the all the heat backed up so no matter how far you move them apart. So it renders the plate useless HEAT RISES you need it to vent out the top the plates are keeping it low in the pit so all the heat just builds up.
Check out these mods I believe it will help you greatly. If you notice the stack was lowered a little but not all the way IMO not enough to change the balance.
http://www.thesmokering.com/forum/viewtopic.php?t=1943
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Old 04-23-2014, 04:05 PM   #10
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Blu is pretty good at these COS cookers, I would try his way. It seems easy enough to accomplish, and free.
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Old 05-11-2014, 01:51 PM   #11
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Default Fire Bricks

Hi All Here is how I placed the fire bricks in my COS..Didn't help much to even out the temps.
Next time going to plan "B", cover the charcoal grate with aluminum foil and put some small holes close to fire box and bigger ones, away from the firebox.
Thanks Dan
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Last edited by DanB; 11-04-2014 at 02:39 PM..
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Old 05-24-2014, 03:30 PM   #12
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Hi All Here is plan "B". What do you think?
Should I leave the tuning plates in or take them out. I'm leaning towards taking them out.
Hope the holes are big enough?
Will post back with the results after the hoilday smoke.
Thanks Dan
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Last edited by DanB; 11-04-2014 at 02:39 PM..
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Old 05-24-2014, 04:10 PM   #13
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What in the Sam Rayburn does "COS" stand for? Something off-set?
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Old 05-24-2014, 06:48 PM   #14
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Cheap Offset Smoker

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Old 05-24-2014, 06:58 PM   #15
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Quote:
Originally Posted by Norm62 View Post
Cheap Offset Cooker
Ah! Like "ECB"!
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