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-   -   UDS intake pipe diameter (http://www.bbq-brethren.com/forum/showthread.php?t=153263)

Freddy j 02-06-2013 11:05 AM

UDS intake pipe diameter
 
what size pipe & valve is everyone using on UDS intake? also, does one intake provide enough air to get the temp up to 325-350F?

gtr 02-06-2013 11:12 AM

Mine are 1", I believe most people use 3/4". One intake is probably not enough - I have 3, and usually shut one down once the pit is going and have one wide open and the other I adjust with a ball valve. I normally cook at higher heat - usually around 300. It's probably worth mentioning that my exhaust is 2" pipe with an elbow (always open), since exhaust figures in to air flow & pit temps.

Warthog 02-06-2013 11:13 AM

3/4" pipe and valve. You will need at least 3 intakes. 1 with valve and 2 with caps

Kloogee 02-06-2013 11:21 AM

I think you'll find there are a million different combinations different people have had success with. From my reading on the forum, I think the majority of people have gone with 3 intakes of 3/4". That is what I went with and so far so good for me.

Good luck with your project. Please make sure to share pics when you finish.

pal251 02-06-2013 11:23 AM

I have 4 3/4 pipes. One has a ball valve and the others have caps. Only used it a couple times but if i remember right the last time it stayed at 250 exactly with just the ball valve being open. If I come across any more ball valves I'm gonna replace the nipple caps with it

ITBFQ 02-06-2013 11:37 AM

If you're going to build a UDS, you absolutely have to read the UDS thread - you will learn a TON. And, don't over complicate it. The KISS principle applies here.

Carbon 02-06-2013 11:38 AM

With four-3/4" clear openings I can easily reach 350°F, faster with more lit coals to start out with if that's where you want it to go.

Garrett 02-06-2013 11:43 AM

1 Attachment(s)
I have 1 3" intake that I made a makeshift daisy wheel out of. Works great, I can cook as low as 225 and up to 450 with steady temps.Attachment 75478

Freddy j 02-06-2013 11:51 AM

Quote:

Originally Posted by Garrett (Post 2356954)
I have 1 3" intake that I made a makeshift daisy wheel out of. Works great, I can cook as low as 225 and up to 450 with steady temps.Attachment 75478


that is awesome! i would love that for my PCB!

conns79 02-06-2013 12:05 PM

Just finished mine a couple of weeks ago, and I went with 3-3/4, 2 caps and 1 ball valve. With 2 capped, and the ball valve open, I was holding steady at 225 with an outside temp of 20. With 2 open, I was at 325 and it was still slowly rising before I capped it.

Bludawg 02-06-2013 12:33 PM

I have 3 X 3/4" 2 nipples and one ball valve, I am about to build a new one with 1 3" intake.

Mark 02-06-2013 01:36 PM

1 Attachment(s)
Quote:

Originally Posted by Garrett (Post 2356954)
I have 1 3" intake that I made a makeshift daisy wheel out of. Works great, I can cook as low as 225 and up to 450 with steady temps.Attachment 75478


what you did except use the whole bottom of the UDS

foam2 02-06-2013 02:09 PM

with the vent at the bottom I think you may have some issues with ash clogging up your intake especially during long cooks.

J-Rod 02-06-2013 03:04 PM

One 1-1/2" intake with draft pipe, ball valve up high and easy to reach. I can reach 350* easy, run it half open it'll cruise 275* for hours, and my fire burns evenly. No need for 3+ separate intakes IMO, not to mention capped ones mounted down low just mean bending over which is a pain in the ass especially if your smoker is in a tight area. Like others said keep it simple man.

Garrett 02-06-2013 03:04 PM

Quote:

Originally Posted by Freddy j (Post 2356965)
that is awesome! i would love that for my PCB!

PM me and I will be glad to make one up and send it to you.


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