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Q-talk *ON TOPIC ONLY* QUALITY ON TOPIC discussion of Backyard BBQ, grilling, Equipment and just outdoor cookin' in general, hints, tips, tricks & techniques, success, failures... but stay on topic. And watch for that hijacking.


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Unread 05-31-2010, 11:17 AM   #1
fsckedagain
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Default uh oh uds never got hot enough

So, uhhhh. I think I may have a problem. I went to bed last night after throwing on a cross rib roast and pork shoulder. Long story short the uds never got back above 180 from what I can tell. It was 230 when I put them on, but for some reason never went back up. Can I save this or do I need to toss the meat.
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Unread 05-31-2010, 11:31 AM   #2
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As long as it didn't drop below 140 you can save it. Sounds like you have a airflow prob with the uds how many intakes and what size how large is your exhaust?
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Unread 05-31-2010, 11:37 AM   #3
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No, it never went below 140, I don't think. I have 8 1" exhausts and 3 1 1/2 intakes 1 fully open and 1 partially open.
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Unread 05-31-2010, 01:05 PM   #4
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my lower than expected temperature moments are usually caused when I forget to gently kick the bottom of the drum to knock some ash out of the firebox.
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Unread 05-31-2010, 03:30 PM   #5
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8 1" exhausts is like an 8" hole in the top of it, thats a big exhaust. Not sure if that would cause low temps, was it new fuel? and what kind of fuel were ya using?
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Unread 05-31-2010, 03:33 PM   #6
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I would say it all depends on what the meat temp was and how log it stayed below 140.
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Unread 05-31-2010, 05:39 PM   #7
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No Stiffy, 8 1" holes is not anywhere near the same as an 8" hole. Use the formula pye X radius squared
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Unread 05-31-2010, 05:43 PM   #8
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I havn't the time to figure it out exactly right now, but think of it this way. Eight quarters is a lot less in area then a saucer.
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Unread 05-31-2010, 09:45 PM   #9
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Default huh?

Quote:
Originally Posted by Captain Dave View Post
No Stiffy, 8 1" holes is not anywhere near the same as an 8" hole. Use the formula pye X radius squared
a 1 inch hole or 1x3.141593 x 8 holes = 25.16744
is not the same as
an 8 inch hole or 8x3.141593 = 25.16744?
looks the same to me.
Too much out, not enough in in 1.5x3.141593x3 =14.4371685 half of that leaves 7.06858425 less than a third of your out put was being replaced. Choke up your output should increase your temps or increase your intakes or both. You'll figure it out.
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Unread 05-31-2010, 11:21 PM   #10
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Quote:
Originally Posted by Wyobulldog View Post
a 1 inch hole or 1x3.141593 x 8 holes = 25.16744
is not the same as
an 8 inch hole or 8x3.141593 = 25.16744?
looks the same to me.
Too much out, not enough in in 1.5x3.141593x3 =14.4371685 half of that leaves 7.06858425 less than a third of your out put was being replaced. Choke up your output should increase your temps or increase your intakes or both. You'll figure it out.
Your ignorant... And what's worse, your condescending. Or a smartass might be the word for it.
Your formula is flawed.
8-1 inch holes is 25.12 square inches
1-8 inch hole is 200.96 square inches
eight times more.
So if your going to take the time to post and make someone look stupid, use Google or a 5th grade kid so you don't make yourself look stupid and a jackass.
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Unread 06-01-2010, 12:00 AM   #11
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Area =pi*(r*r)

1" hole covers an area of 3.14159 * (0.5*0.5) = 0.7854 square inches
8 holes = 0.7854*8= 6.2832 square inches

while one 8 inch diameter hole covers= 3.14159*(4*4) = 3.14159 * 16 = 50.26548 square inches.

Least that's my math. If I'm wrong in calculating surface area ...... then bitch to http://www.calculatorsoup.com/calcul...ane/circle.php
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Unread 06-01-2010, 12:20 AM   #12
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Quote:
Originally Posted by QuietOne View Post
Area =pi*(r*r)

1" hole covers an area of 3.14159 * (0.5*0.5) = 0.7854 square inches
8 holes = 0.7854*8= 6.2832 square inches

while one 8 inch diameter hole covers= 3.14159*(4*4) = 3.14159 * 16 = 50.26548 square inches.

Least that's my math. If I'm wrong in calculating surface area ...... then bitch to http://www.calculatorsoup.com/calcul...ane/circle.php
Yep, you got it right. Radius is half the diameter. The area of an 8" hole
is approx. 8 times the combined area of 8 one inch holes.

It sounds like his exhaust is equivalent to approx. 2.75" diameter....not very big, but not much smaller than my BSKD, but I doubt 8 1" holes draw the same, I would guess less.

So much for a hole is a hole is ahole.
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Last edited by ibait2fish; 06-01-2010 at 12:37 AM.. Reason: comparison
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Unread 06-01-2010, 12:50 AM   #13
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Quote:
Originally Posted by jeffboyette View Post
Your ignorant... And what's worse, your condescending. Or a smartass might be the word for it.
Your formula is flawed.
8-1 inch holes is 25.12 square inches
1-8 inch hole is 200.96 square inches
eight times more.
So if your going to take the time to post and make someone look stupid, use Google or a 5th grade kid so you don't make yourself look stupid and a jackass.

doh! He he he
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Unread 06-01-2010, 06:43 AM   #14
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Quote:
Originally Posted by FIREANDFLAMES View Post
doh! He he he
yeah what he said
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Unread 06-01-2010, 06:57 AM   #15
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It seems to me like the ventilation is fine. It's at (or close to) what most people claim to use in their UDSs. So, I wonder if you used enough (or good enough) fuel or if there is something wrong with your fire basket?
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