The longer it takes for the outside of the meat to reach 140° the deeper the smoke ring will be and the more smoke will get absorbed. After it reaches 140° its not going to accept any more noticeable smoke. However the bark will continue to develop.
Since my rub has brown sugar in it, the bark continues to darken even in the foil. So, after the outside has developed a nice color I usually foil and raise the pit temp to around 275-300° to cut down on cooking time. Plus I take advantage of the foil by adding a braising liquid and catching the juices.
So IMO it basically becomes a matter of preference. Would you rather have a more
developed bark or a shorter cook time?
One other note: A small pan of water in the grill (to keep moisture up) also helps the smoke ring develop.
And your preference As far as taste is?
Rick,
It does develop a great bark that way, which is why I do it that way.
Here are some pics of what we're talking about:
(I hope Squirt and FLBentRider don't mind me using their pics for demo purposes)
These were done by SquirtTheCat (left) & FLBentRider (right). See how beautiful & well developed their bark is? If you want a bark like this use the method they use.
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Here's a couple I did where I foiled (or cooked in a foil pan covered). You'll see the bark is nowhere nearly as developed. You sacrifice the bark for shorter cook times & foil juices.
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