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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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Old 05-13-2013, 06:58 PM   #16
Lake Dogs
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pipes, if you can, OVER the fire box, and as high in the tank as possible. Remember, heat RISES. Let it rise to exit, creating a draw.
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Old 05-13-2013, 07:03 PM   #17
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Without knowing the size of the firebox you have just looking I would say a 6" pipe 20" long would get you there. Personally I feel like your location is not the Killer it is flow restriction associated with the 90s
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Old 05-13-2013, 07:18 PM   #18
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fire box is 22x22x20
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Old 05-13-2013, 07:55 PM   #19
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Can't see all the 90* bends, but TQ is right. I would wack off the exhaust so it does not extend any lower than the top cooking grate. The 3.5 inch exhaust is too small but keep the altitude (35 inches is pretty good for draft). Also, the intakes (2@2x6=24 sq in) are right at the minimum limit, given your cook chamber size you need intake and exhaust to be more like 30 sq in.

Bottom line (IMHO) for a 120 gallon tank, a 6 inch exhaust = 28 sq in is enough but you need a little more intake (2@ 2x6 = 24 sq in) try to add another 2x6. Either cut the stack flush with the top of the tank or not more than the top of the upper cooking grate and keep that stack at 36 inches+.

Best of luck!
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Old 05-13-2013, 08:01 PM   #20
Toast
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Quote:
Originally Posted by TuscaloosaQ View Post
I was a pipefitter for many years the 90s in my opinion are restricting flow. I currently work in a refinery and have for a long time any engineer will tell you 2 many 90s closer together = flow restriction
Amen. You have to go straight for every 90 and it's measured in pipe diameters. Same in HVAC.
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Old 05-13-2013, 08:18 PM   #21
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ok thanks for the info. we are going to cut off the 90s first. then we will add more air intakes if needed. then we will get a bigger pipe if that does not work. thanks for all the info. I will keep you folks updated. won't be till Thursday till I can test any of this out.
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Old 05-13-2013, 08:56 PM   #22
boiler93
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I would recommend ditching the 90's and increase exhaust to 6"
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Old 05-13-2013, 10:18 PM   #23
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I just baught a reverse flow from custom pits. I found a thread on here that said a guy just got one also and we were both having problems with temp. he put a bigger exhaust on his and it fixed his. I put another inlet on mine and it also fixed it. I would suggest fixing one thing at a time instead of fixing everything at once untill you achieve the temps you want. I also had a small gap on my door with high temp felt and I think that helped a lot!
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Old 05-16-2013, 10:31 PM   #24
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update. we cut out the 90;s. fired it up and with in 45min it was rolling at 264. we are going to change our charcoal/wood ring. I think if we lift it up some to get the air under the fire not level with it. thanks for all the tips.
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Old 05-16-2013, 10:34 PM   #25
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I like a success story that is what it is all about people helping people!!!!!!!!
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