Wildly Unpredictable Temps

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jackstorey

Newbie
Original poster
Jun 22, 2017
7
10
Hey Everyone,

I'm breaking in my newly modded OK Joe's Highland, and we're at hour 10.5 on an 8lb Pork Shoulder. I started with charcoal and wood chunks at 0600, and it got up to temp in reasonable time. I put the shoulder on at 0700 and added a few more chunks. I wanted to run this a bit hot so that tonight's guests could eat at a reasonable hour, so I aimed for 275F. I was able to push it much higher than that (by accident) with a few larger splits, but after that peak (330F) I lost the ability to control much of anything, and the - while the fire is raging - the temps have wildly fluctuated between 190F and 265F pretty much all afternoon at this point. 

The shoulder is dark, but internal temps are reading 173F, so there's still a ways to go. I got a bit of a Stall at 159F, but pushed through within an hour or so. I wasn't going to wrap, but decided to at this point since we're still 20+ degrees away from done, and I'd like to be sure our guests are plating up by 6:00ish, with at least 30 minutes for the shoulder to rest. 

Even though the mods were done correctly, I'm losing a ton of smoke from the main lid, despite the gasket. The silicone seals are holding up well, and the gasket around the firebox seems to be doing its job. I also think the wood I managed to get my hands on this time around wasn't of great quality, but it burned ok.

Any advice/thoughts on why my temps were so wildly vacillating, despite being diligent with the fire?

It's 74 degrees, sunny, a little windier than usual, but otherwise perfect outside.

Thanks,

Jack 
 
IMO, there several things here that will help.

1. Wrap when you first notice the stall. Leave it wrapped until your pull temp (200-205*) is reached. This temp can be confirmed with the freedom of the bone pulling out.

2. An offset has a range that it likes to run. You pushed it to 330*, but it didn't like that. It sounds like it prefers 190-265*. That is a fairly large range, but with a little time, you can manage that closer to a 30-45* difference. An offset will not cook at a specific temp. If you can put in a couple of splits at around 225*, you should a peak around 270 and then it might settle down to around 260. Don't let it get all the way to the floor of your range before you add fuel.

3. Always keep a good bed of coals. Plan your fuel add to coincide with the temp drop to keep the coals built up.

4. Always pre-heat your splits. Keep 2 or 4 on top of the FB at all times. A warm split will ignite much quicker. This will keep the temp from dropping as drastically and will also keep the smoke cleaner.

5. Good fire and heat management is a fairly steep learning curve. Mastering it takes a while, but is a lot of fun and will give you a great sense of accomplishment.

Remember, when you have the fire and heat management totally under control, it will start to rain and the wind will be blowing. At that point, you will need to make some adjustments, but you will have the confidence to make them without any frustration.


Good luck and good smoking, Joe. :grilling_smilie:
 
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Great advice Joe!  Whenever I read someones procedure with offsets, I really really want one!  One day....
icon_rolleyes.gif


Mike
 
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Every pit is different and all requires learning to manage the fire to achieve proper temps.
Offset smoking is an art..... be ready to get mad, disappointed and amazed! Good luck and enjoy.
 
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in my ok joe i use small splits  to get a better temp control.  as was stated  above burning wood  and keeping the temp in a range is a  skill you have to learn it takes time .

 you have to know the pit then  understand the fire see how its burning look at the wood  at what stage of burn is it at. looking at the wood and how its burning you eventually know "hey ive got prob 10 min before i need to throw another split on" So then you have to figure out ok do i need another bigger piece or do i add 2 smaller pieces then a bigger one  to keep the temp at 280 to get the optimum fire. its like a chess game  you have to think a couple moves ahead .

the best advice id  say practice  with no meat in the cooker  just light it up on a Saturday and work at temp control and burning a clean fire that way the pressure is off you dont have a  chunk of meat in the cooker and a hungry family looking at you if you screw up 
 
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