Can a UDS air intake be too tall?

I'm working on the whole problem too!

I'll introduce my variation, with pictures in a couple of weeks time.

Secret plans in the works, I could tell you about it, but then I'd have to kill myself. :roll:
 
Is it possible to have too much exhaust? i have 8 9/16" holes in my lid spaced equally around the lid. and 1/2" intakes. would this cause it to not run as hot?
 
For my UDS, too much exhaust cause it to run HOT.
 
What do you need pipes for? With my luck I'd bend or break dim sunbitches.

I got 3 holes down around the bottom. With opening only the front ball valve I stay right at 220 to 230(till the roosters fark the chickens if need be). With ball valve and side nipple open, I'm up at 275 to 300(perfect for spatchcocked chickens).

How much lift do you have under your fire box?
 
Oh Keale, I've learnt the hard way-----you CANNOT leave your lid off for too long, with turning it into a jet rocket booster.
 
OK - I came home today and took off my two risers. Put the ball valves on the pipe nipples on the bottom of the drum ( 3 of 'em) and lit it up. I've not been able to get past 210, but right now, with only about 1/3 of a basket of old lump, my drum is humming along at 260. My exhaust holes are equally spaced around the outside of the lid (5 - 3/4" holes), and the outside thermometer is reading 260 and the inside one, in the middle of the grate is reading 270. I'll cook on it this weekend (new WSM won't be here yet) on see how the temps do then. For now, lower is better!
 
Well, sorry for taking so long to update my own post... On the second UDS I built, I put 2 1" intake 'nipples' with ball valves on the bottom of the barrel and left off the upright pipe... I have 4 1" exhausts on top. This is the way I will do it again. Works like a champ. Easy and consistent temp control.

I took the pipe off the 1st one and same results.

The other thing that I had problems with on the first was the thermo on the side of the drum was erratic. At first I chalked it up to being a cheap $10 thermo... It was mounted almost directly above one of the intakes on the bottom... Second UDS I put it 90° from the two intakes and it reads correctly... So don't mount your thermo directly above an intake!

lessons learned...

James.
 
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