hot tunnel surface

[Kenneth Cole]

Hi
First time here. Got a 1991 and wondering about the tunnel and how hot it gets. I would like to make a cover which would be plywood covered with indoor/outdoor carpeting on it and wrapped around the edges. Do you think this would be ok and should I place some sort of heat shield down first?

Than
Ken

 

[erasedhammer]

Hi
First time here. Got a 1991 and wondering about the tunnel and how hot it gets. I would like to make a cover which would be plywood covered with indoor/outdoor carpeting on it and wrapped around the edges. Do you think this would be ok and should I place some sort of heat shield down first?

Than
Ken

Had the same problem when I got my humvee. The tunnel would burn if you touched it on a hot day. I got tired of it and put down a 2" rubber mat over the entire tunnel. I've had no problems with the mat.

 

[Sintorion]

If you search ebay for tunnel deck panel board you will find what you are looking for. It will make a world of difference.

 

[Bulldogger]

The tunnel decking mentioned is good, and I have noticed an improvement in my rig since I installed the one TheCaptain gave me. It is an official mod, so you can find the patterns if you look I'm sure. Our HMMWVs came from very different states, and his deck screwed into my ride with the exact same mounting holes.
Besides decking, some do insulative spray liners above or below the tunnel, others wrap the exhaust headers and pipes. I'd like to wrap my pipes, but it is a lot of header tape to do all that! And handling fiberglass tape gets old, and itchy, fast. I still might though. Can't afford 200' (or whatever) of tape for now. If I ever take my driveline out, or remove the cab for any reason, I will seal and coat the underbody with sound and heat covering for sure.
Bulldogger

 

[Bravojmc]

The tunnel decking mentioned is good, and I have noticed an improvement in my rig since I installed the one TheCaptain gave me. It is an official mod, so you can find the patterns if you look I'm sure. Our HMMWVs came from very different states, and his deck screwed into my ride with the exact same mounting holes.
Besides decking, some do insulative spray liners above or below the tunnel, others wrap the exhaust headers and pipes. I'd like to wrap my pipes, but it is a lot of header tape to do all that! And handling fiberglass tape gets old, and itchy, fast. I still might though. Can't afford 200' (or whatever) of tape for now. If I ever take my driveline out, or remove the cab for any reason, I will seal and coat the underbody with sound and heat covering for sure.
Bulldogger

Man the only thing I've ever seen with exhaust wrap is the moisture gets caught in that rap and rusts exhausts out way faster than It would without them. I think the rap is good on some applications and bad on others.

 

[Bulldogger]

Man the only thing I've ever seen with exhaust wrap is the moisture gets caught in that rap and rusts exhausts out way faster than It would without them. I think the rap is good on some applications and bad on others.

Can't argue that HMMWV offroad exhaust won't degrade even faster, and that's a good point to share. I haven't driven with the new decking long, maybe that will be enough. I'm unlikely to get around to wrapping anyway, but will keep your point in mind for sure.
Bulldogger

 

[Kenneth Cole]

Gays
Thanks for the help.
Ken

 

[Bravojmc]

Gays
Thanks for the help.
Ken

I'm pretty straight fella!

 

[papakb]

One of the reasons the tunnel gets so bloody hot is the closeness of the right hand exhaust manifold. Because the engine is offset to the right there's no space to do much of anything on that side, especially at the back of the block. I've had 2 exhaust manifolds split into 3 pieces because of the expansion and contraction on the right side but never on the left. Wrapping the manifolds is a good idea to cut down the heat and there are several companies that make thermal insulation that can be used to line the tunnel to help hold the heat down but in the summer it's always going to be hot. Another simple trick is to cut a rectangle from floor mat and slip it down next to the E brake. This will keep you from cooking your right thigh as you drive.

Quite a few owners have used what's called horse stall matting on the trans tunnel. The stuff I've seen is made from shredded rubber, black in color and about 1" thick. It cuts down the heat and also keeps the floor from getting damaged. I think most equestrian tack shops should have it.