Water in Stacks?
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Senior User
Joined: Oct 2004
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From: Bonney Lake, WA
Water in Stacks?
For those of you with stacks, what do you do to keep the water from building up in them. I will soon be installing stacks on my truck and since I live here in washington I was just wondering what others have done. I was just thinking about drilling a small hole at the lowest point. Has anyone done that? Does it work?
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Joined: Sep 2006
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It will help leak exhaust under your passenger compartment if you do that. I imagine that not much water can fall in stacks in the first place. Whatever water does find its way in will probably evaporate once the truck reaches operating temperature. If it were a bad idea, I'm sure 18-wheelers wouldn't have been doing it for aeons
Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
if you use plain angle cut tips, you need to put some type of flapper valve on them unless it's running all the time, once in awhile getting water in there won't hurt as wolfe said it will evaporate but on a semi they run for hours at a time without shutting off so plenty of time to clear it all out. Best bet is to put a turnout type of tip on them that will keep 99% of the water out of there.
Here is an example of a rain cap for a miter cut tip.
http://www.iowa80.com/iowa80/shop?me...t&prodid=62589
Here is an example of a rain cap for a miter cut tip.
http://www.iowa80.com/iowa80/shop?me...t&prodid=62589
Last edited by monsterbaby; Dec 17, 2006 at 12:12 PM.
Hotshot
Joined: Dec 2003
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From: iowa
Well I run upright puller headers on the race truck and I use sewer pipe rubber plugs that fit in the pipe easy to push in and they keep everything dry inside, but then again it's only used on race days.
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
I dont see much of a water problem with my 6" miters. It sometimes sits outside in the rain, and i do have a drain hole at the lowest point. It is about the size of a smiley 
and i can feel some exhaust pulsing at idle out of the hole, but it doesnt hurt anything.
Even if you do get water in them it will not get in the engine, as the downpipe goes upwards at the engine and the worst it could do is just SIT in the bottom of the pipe and get evaporated as the engine runs.
Even with turnout stacks you can still have water in them, the only way to not get water in them is to park directly into the headwind/rain, but that won't always happen.
and i can feel some exhaust pulsing at idle out of the hole, but it doesnt hurt anything. Even if you do get water in them it will not get in the engine, as the downpipe goes upwards at the engine and the worst it could do is just SIT in the bottom of the pipe and get evaporated as the engine runs.
Even with turnout stacks you can still have water in them, the only way to not get water in them is to park directly into the headwind/rain, but that won't always happen.
Postmaster
Joined: Dec 2005
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A few of my friends run mitres, and they do not do anything about the water. When you start the motor it will either blow out or evaporate when the engine get to operating temperature.
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Lead Driver
Joined: Oct 2004
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From: Columbia, MO
My 5" mitres have not given me any problems with the water. Even in a heavy rain, only a small amount will come out. There is a very small gap where my flex pipe connects to the elbow that lets most of the excess water drain out. I don't feel any exhaust coming out, but the water can drain.
The worst it's been was a few weeks ago when we got 1"-2" of ice, followed by 15"-18" of snow. The truck was outside, stacks uncovered, not run at all while it was icing and snowing. I started it up the next day when it finally quit snowing, and it blew a little more water out than I've seen before, but I would bet the total amount of water was a less than 1/2 a cup.
The worst it's been was a few weeks ago when we got 1"-2" of ice, followed by 15"-18" of snow. The truck was outside, stacks uncovered, not run at all while it was icing and snowing. I started it up the next day when it finally quit snowing, and it blew a little more water out than I've seen before, but I would bet the total amount of water was a less than 1/2 a cup.
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Thread Starter
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Senior User
Joined: Oct 2004
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From: Bonney Lake, WA
So I should be ok to just drill a hole in the lowest point, then if I know its gonna be sitting in the rain for a while just throw something over them (bucket, folgers can)?
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Joined: Mar 2006
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From: south jersey
harvey you might want to watch out in a situation like that becasue if you by some chance get a lot of snow and get a sufficient pack in there and a little water to freeze it tight that would make quite a strong plug in there and could pose a problem on the next start up
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
wolfe, I think you would be fine to drill a small hole at the lowest point, something like a 1/8" hole.
Kramer, I was super cautious when I started it up, to make sure exhaust was coming out. I was actually standing on the running boards, facing the back of my truck, looking back at the stacks, and reaching across the steering column to start the truck with my left hand. If exhaust hadn't immediately started coming out, I would have shut it down.
Kramer, I was super cautious when I started it up, to make sure exhaust was coming out. I was actually standing on the running boards, facing the back of my truck, looking back at the stacks, and reaching across the steering column to start the truck with my left hand. If exhaust hadn't immediately started coming out, I would have shut it down.
