Need help with large offset I just bought

Bassman467 · Feb 20, 2017

I'm going to put a door on the end an a large damper. Says I need like 40sq in of air intake

dwfisk · Feb 20, 2017

pitbossJB said:
I think it'll work, you'll just have to leave the door open to get a clean fire and move the exhaust to the end and make it bigger as said before.

Looks like the current firebox door is the top 1/2 of the round firebox so he can't leav it open for more air flow; won't get any draft into to cook chamber.

Bassman467 said:
I'm going to put a door on the end an a large damper. Says I need like 40sq in of air intake

Good start, I would oversize if you can and keep the inlet as low as possible.

Bassman467 · Feb 20, 2017

I was looking at the last 12 wheel damper on bbq smoker supply.

Bassman467 · Feb 20, 2017

Here's a pic of the firebox to chamber opening, and a pic of the stack on the inside. Lots of creosote.

SmittyJonz · Feb 20, 2017

I would block/plate off the bottom 4"-6" of the FB to Cook Chamber Hole......
Smoke Stack comes in under the cooking Grate.?

Close that Off and put Real exhaust on the End. I'd box the exhaust then into 6" pipe like pic above, probally make the exhaust opening wide like 4" H x 10" W or such at Grate level or just above.

dwfisk · Feb 20, 2017

I saved this image from another thread posted on here; it shows a really neat way to skew to opening to the bottom of the firebox.

I think if you can fit a 6"-7" radius, less a 1"-2" center hub, you can easily get to plus 40 square inches.

Bassman467 · Feb 20, 2017

Stack is no where near the grate. It's on the very top of the chamber. Dosent come down at all. I was seeing about 100 degree difference between the top of the cooker an the food grate. The heat just comes out of the box and goes straight across the top.

DownHomeQue · Feb 20, 2017

Hey I think you definitely need more intake and exhaust needs to be relocated. like everyone else says

DownHomeQue · Feb 20, 2017

I think that unit could benefit from some tuning plates also.. To help it get even temps from firebox side to exhaust side.

Shagdog · Feb 20, 2017

SmittyJonz said:
I don't understand the stack in the middle if the pit.? Don't make any sense. :crazy:
If you blocked the 2nd half off right past the smoke stack it'd probally Run fine. If you didn't want or need the pit that Big you could chop it off right there and plate the end and make a grill with other half. That's what I would do.......

I was going to ask, on the inside, is that all one cook chamber? It looks like the left door is a grill and the right door is the smoker. Is there a seperator betweeen the 2 sections? If not, there should be, if you're going to leave the stack there. Your intake is way too small on that firebox. Like paul said, you can make it work with enough intake, but you're just not even close. If you wanted to run a clean fire in that right now, its going to need to be a real small fire, and you'll only be able to smoke on the right side.

Bassman467 · Feb 20, 2017

I think I'm just going to use the calculator that was suggested to me. I'm definitely going to move the stack to the end. Should it be on the very end even with the grate? I was thinking like an elbow. Maybe 6 inch pipe?

Yes it's one cook chamber

4ever3 · Feb 20, 2017

Your going to have to choke down the throat (cook chamber to firebox) along with moving the stack, otherwise there's no way to make it draft right

Bassman467 · Feb 21, 2017

Thanks to all you guys for your help. I've got a lot of ideas

DownHomeQue · Feb 21, 2017

another thing is maybe this smoker was built to be run with the firebox door opened? Franklin style? but either way the exhaust has to be moved to the opposite end.

Bassman467 · Feb 21, 2017

The more I think about it the more I like the idea of making two chambers out if it. I do grill a lot too. It would be nice to have half grill half smoker.

medic92 · Feb 21, 2017

Looking at the holes in the firebox, I wonder if the previous owner had some kind of bbq guru-like system that he used to force airflow. No idea whatsoever about the stack in the middle. Maybe he was OCD and couldn't stand to see it on the side.

Bassman467 · Feb 21, 2017

I think he said it was used as a grill originally and that the fire box was added later

GreenSmoker · Feb 21, 2017

Stack is choking it for sure...fb sounds small....opening to the cook chamber may be the third issue...and as was mentioned, the stack being mid ship is way odd....IMHO...

Bassman467 · Feb 23, 2017

Got a fab shop building everything. Hope to get it all soon. Ready to fire up the torch an welder. Thanks again guys.

Bassman467 · Feb 27, 2017

I just got my two thermometers in today. Where should I put them in was thinking on pretty close to the fire box in the bottom of the door as close to the grate as possible. What about the other one?

Need help with large offset I just bought

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