Help me with my firebox please

[Zak]

Looks like you simply need a bigger fire and possibly more vents. I'd first try burning a larger fire with the door cracked and see what it does. If you're getting 225-250 with that size of a fire, then you dont need a larger firebox, just a larger heat source, ie fire. Once you know you can get higher temps with a larger fire and door cracked, then you know you need more air flow so installing a vent or 2 may fix the problem. That looks like a pretty large smoker and made of thick steel so make sure you're giving it plenty of time for it all to come up to temp.

 

[Bludawg]

I'm just going by the picture an instinct using the chamber size of 30 X 84

Fire box should be 30X30 X 20
Chimney 6X 35
Firebox air intake 59.4 sqr in
Firebox to chamber opening 1/2 moon 20.8 " or 158.4 sqr in

So this says your FB is to small and the opening to the chamber is To big

 

[ButtBurner]

If you add more or bigger intake dampers, you might think about being sure that they allow for air UNDER the fire grate. The current intake dampers look a little highly placed to get air under the fire, in fact if they were lower the dampers that you have would probably be enough!:-D

good point

maybe ypu can raise the firegrate with bricks for a test to see if that helps

so from your sig I take that this is a Greasy Hill??