fire box size

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JustinCouch
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fire box size

Postby JustinCouch » Thu Jan 05, 2017 2:18 pm

what if anything happens when your firebox is to big. I mean as long as you don't overfill it I don't think there would be any problems. what do yall think
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k.a.m.
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Re: fire box size

Postby k.a.m. » Thu Jan 05, 2017 3:35 pm

Too large a firebox changes the way a cooker drafts.
If you watch the calculator numbers A 24" x 4' cooker with a 20" Sq. firebox is about 110% over sized and requires a 4" chimney 32" tall. If you increase the firebox size to 24" Sq. you are now 191% and the same 4" exhaust would increase to 55" tall to compensate for the extra volume in the firebox. You can also manipulate the 1/3 rule here by adding a larger diameter exhaust but your draft iwill still be stronger than keeping a balanced 1/3 design.
Will it work? Sure it will once you learn how to control it.
Always remember slow and steady wins the race.

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JustinCouch
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Re: fire box size

Postby JustinCouch » Thu Jan 05, 2017 7:56 pm

It's going to be interesting. The guy that cut the pipe for my firebox cut it to long. That was all the steel I had. Cook chamber is 37 inches and my firebox is 24 inches. I hope it works out.
JustinCouch
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Re: fire box size

Postby JustinCouch » Fri Jan 06, 2017 12:54 pm

great news, I was able to contact my welder today and he said he did not cut the pipe yesterday like I thought he did. I went back and did my calculations and by box will be at about 113.6 percent size diff. I am so glad!

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