Oversizing a fire box

Discussion in 'Reverse Flow' started by wildbill1954, Dec 16, 2015.

  1. wildbill1954

    wildbill1954 Newbie

    Hello everybody – new to the forum but not to smokin’

    I have a couple of questions about retrofitting an old New Braunfels Smoker that has a burned out fire box. I want to convert it to a reverse flow type and have been wandering around the forums looking for info. I have a couple of questions about this modification. One of the things that used to drive me nuts was the small firebox size – 17” x17” round - 3856 cu in. I would have to get up a couple of times in the night to re-load wood in it if I was cooking a large brisket or 2. I had long planned on making a bigger fire box and dampening down enough to let it go until morning. Using Aliens ratios and Dodis’s Excel chart I find that the original firebox – to - cook chamber was about twice what the recommended size of 6.25 in round. I would like to use a rectangular fire box and connect to the chamber the chamber with 6” pipe with a damper in between. Is there some factor that I’m unaware of that says the fire box and must be smaller to match the cook chamber if I stick to the smaller size for the connection?    Also I haven’t come across any mention of the heating chamber size or the distance that should be between the cook surface and the baffle plate. Anybody have a definitive answer or know where to look?

    Thanks and glad I joined – this looks like a great site!

  2. maple sticks

    maple sticks Smoking Fanatic

    I would say what you had is darn good. I tend my stick burner every 30-45 minutes. Can't say as I have ever heard of an all night load in a stick smoker.

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