New RF trailer smoker

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Black Titan

Newbie
Original poster
Jun 11, 2024
19
34
Hello all,

It finally happened. I got the go ahead from the boss to purchase a larger trailer smoker that ive been wanting for awhile. I kept searching marketplace for something local, and finally found this 150 gallon reverse flow with a warming box at a reasonable price and only about a 2.5 hour drive to go pick it up.

They are made by a trailer shop down in GA. The smoker is pretty decent construction, with some quirks. Its a thick propane tank with a 3/16 or 1/4" firebox, i havent measured. Has a 4" diameter stack of only about 15". Two pie hole vents on the firebox, one on each side.

I do have a few things i need to fix on it. The cut for the top of the right side door looks like it may have been cut at 4:59 on a Friday. The tops of the doors do not have the 2" 1/8th plate border like the bottom and sides do. I bought some 2" flat bar to remedy this and cover up that gash. It does leak smoke.

I am having a bit of difficulty getting it up to good temps. I cant get the left side of the smoker (farthest from firebox) very much over 250, even with 6 logs burning pretty good. The right side does get over 300. There is about a 30-50 degree temp swing across the smoker, verified by both the door gauges as well as thermapro probes inside.

My cousin who does some competition smoking recommended i increase the stack size. Ive ordered 2ft of 6" schedule 40 to replace the small 4" stack. Here is where I have some questions -

There is a top and bottom cooking grate. Should I extend the stack into the cook chamber by an inch or 2? I've been trying to research and it seems some builders will bring it to a couple of inches above the grate, but these are usually single grate chambers they're referring to.

I'm not getting enough air to my fire. If I open the firebox door, I'm losing alot of heat out the door. If I close it, my fire dies down. I had flame out twice on my last 12 hour cook, and couldn't get anything ignited on the second flame out. I ordered an 8" pie plate damper to install into the firebox door to hopefully remedy this.

The "warming box" is actually more of a "heat from the flaming pits of hell" box. The bottom of this box is the top of the firebox, and when it's dark out, it actually glows orange. The temp gauge in the door of the warming box has shown well over 500 degrees. I'm wondering if I install another pie plate damper in the roof of this box, OR, install the 4" stack I'm cutting off the cook chamber, if that will let some heat escape to where i can somewhat control the temp in this warming box.

The cooking chamber measures approx 77" long by approx 23" diameter. The firebox is 24"w x 24" l x 15" high. Using the online calculator, it is slightly undersized. The calculator suggests a 16" stack at 6" diameter. I'm wondering if adding another 8" to this will compensate for the smaller firebox.

There's a few welds to tidy up. The patches used on the bung holes are kind of ugly. I plan to flap disk them and smooth those welds to make it more visually appealing. Also, the corners of the RF plate in the cook chamber where it meets the firebox wall appear to have been snipped off. Not sure why they did this. I assumed they were supposed to be flush. I plan to patch these. If I look down in the corner closest to the door, I can actually see inside the firebox through the half moon hole. Not good if grease goes in there.

Lastly, the bottom left corner of the left door doesn't close all the way. I can not find anything binding that is keeping it from closing. I'm assuming it sprung when it was being cut. Any ideas how to fix this? Theres about a 1/4" gap from the door to the chamber on that corner. If you zoom real far in on the last pic you can see the gap I'm referring to.

Even with these issues, I was able to cook some great BBQ this weekend. 2 butts, a whole turkey, 4 racks of ribs, jalepeno poppers, and a dozen drumsticks. Got great bark on my butts and the flavor was great, using a mix of hickory logs and apple chunks.

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I bought a cheap tongue tool box for the trailer from Amazon to keep my bbq gloves, temp probes, propane torch, ash shovel, tongs, etc in. Going to weld that up this week hopefully.

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BT
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Congratulations on the new trailer! I hope we see lots of photos as you get it dialed in!

Appreciate it! Here's a couple more. Even with the leaks and temp issues, it made some good food. I kept my pork on the cooler side and my poultry on the hotter side. Turkey came out juicy and tender, with a crisp skin.

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BT
 
Great job on the the spatchcocked turkey! I bet that thing was delicious!

It was quite good. I don't even like turkey except for deep fried, but this was so juicy and tender. So much better than oven roasted (dried) turkey. I pulled when the breast got to about 162 and thigh was 175.

Hope i can get a fresh turkey this spring to throw in there.

BT
 
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Congratulations! It's always exciting getting a new cooker, I know. lol

For the turkey - I pull at 155ºF in the breast. Always amazing.

As for that door cut, yeah, looks like someone slipped with the plasma cutter. And they didn't put door trim on the top because they used... D rings AS the hinges. That's the first time I've ever seen that done. Seems a little odd to me, but hey, if it works, it works.

As for smoke leakage, meh, who cares, it doesn't change a damned thing about your cook. It's strictly for brag points to have a smoker that is so 'tight' there are no leaks. You don't lose enough smoke or airflow to affect the cooking in any way. Although I know on my backyard offset (the first one I built) I do get some leakage of smoke around the door and such, but once I get it heated up and it's flowing, there's no leaking. It may actually be pulling some air IN those tiny gaps, but it doesn't hurt the cook any.

Congrats again!
 
Last edited:
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Congratulations! It's always exciting getting a new cooker, I know. lol

For the turkey - I pull at 155ºF in the breast. Always amazing.

As for that door cut, yeah, looks like someone slipped with the plasma cutter. And they didn't put door trim on the top because they used... D rings AS the hinges. That's the first time I've ever seen that done. Seems a little odd to me, but hey, if it works, it works.

As for smoke leakage, meh, who cares, it doesn't change a damned thing about your cook. It's strictly for brag points to have a smoker that is so 'tight' there are no leaks. You don't lose enough smoke or airflow to affect the cooking in any way. Although I know on my backyard offset (the first one I built) I do get some leakage of smoke around the door and such, but once I get it heated up and it's flowing, there's no leaking. It may actually be pulling some air IN those tiny gaps, but it doesn't hurt the cook any.

Congrats again!

Ive been working on some upgrades, and realizing that I won't be able to trim out that door with the D Rings, I purchased a different style of hinge.

So far, I've added a drain and ball valve, added a pie vent to the firebox door so I dont have to leave the door cracked (hopefully), and I welded the tongue box to the trailer.

I picked up 2 ft of sched 40 6" pipe to replace the 4" stack that's on there. Just waiting on my plasma cutter and damper plate to arrive before I tackle that one.

I'm considering enlarging the firebox by about 8 inches in height. On the bottom 1.5", will be a slot for an ash tray to slide out. .5" above the ash tray i would weld in either 1/4" or 5/16 plate that is full of slots/holes to allow the ash to fall through to the ash pan.

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I'm a novice welder, but I managed to get that drain pipe water tight! Even doing it upside down while laying on my back lol.

BT
 
Congrats on the new smoker! That stack sure does look short. Good add of the pie valve on the firebox. My Lang has them in both sides. I wouldn't sweat a little smoke leaking unless it major. The 50 degree difference end to end is something you may reduce some but overall you learn to work with it to your advantage. If you haven't already try running with the nose slightly up, you might be surprised on how that helps bring temp up on that end.
 
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Congrats on the new smoker! That stack sure does look short. Good add of the pie valve on the firebox. My Lang has them in both sides. I wouldn't sweat a little smoke leaking unless it major. The 50 degree difference end to end is something you may reduce some but overall you learn to work with it to your advantage. If you haven't already try running with the nose slightly up, you might be surprised on how that helps bring temp up on that end.

I do somewhat like the temp difference, especially if I'm doing pork and chicken on the same cook. I'll put the chicken on the hotter side to get crispier skin.

My main issue is I just cannot get this thing above 275ish on the left side. No matter how large my fire. I'm hoping the larger stack will help it draft better and heat better.

I played with nose height a little, but hesitant to do it too much until I weld that gap between my rf plate and the firebox. I don't want a big grease fire from drippings rolling off into the firebox.

BT
 
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That's an awesome smoker... Congrats...

I strongly suggest you run your numbers through Dave's calculator... I built my Tractor Smoker (link in signature) to exact numbers in his calculator and it runs like a dream... Yes... Temps are a little cooler away from the firebox but as your finding out it can be used to your advantage...

But anyways... I think your going to need the stack at about 32" above the top of the smoker... Reroute the stack through a collector that comes out the end/side at bottom grate level ...

He also puts a vent at the top of the firebox door which helps draw the hot air in the top of the firebox into the smoker...

A LOT if great info here...

 
  • Like
Reactions: Black Titan
That's an awesome smoker... Congrats...

I strongly suggest you run your numbers through Dave's calculator... I built my Tractor Smoker (link in signature) to exact numbers in his calculator and it runs like a dream... Yes... Temps are a little cooler away from the firebox but as your finding out it can be used to your advantage...

But anyways... I think your going to need the stack at about 32" above the top of the smoker... Reroute the stack through a collector that comes out the end/side at bottom grate level ...

He also puts a vent at the top of the firebox door which helps draw the hot air in the top of the firebox into the smoker...

A LOT if great info here...


Thanks!

That's alot of math! If I follow that calculator, and my numbers are correct, it says I need around a 25" stack. The Feldon calculator says 16". I'll go with the 24" and see how that does. I can always add or remove some if I need to.

BT
 
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