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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Exhaust routing

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Old Jun 20, 2021 | 09:39 AM
  #1  
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Exhaust routing

I know the original exhaust routed over the rear axle to the back of the truck. I was wondering if dumping the exhaust in front of the rear wheel would be a stinky problem? I currently have what is pictured. I could easily buy a straight pipe and curved piece and run the exhaust to the rear wheel. Or, should I run it to the back of the truck. I don’t want exhaust stink in the no AC truck.


 
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Old Jun 20, 2021 | 09:40 AM
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It shouldn't it is how I have my dual exhaust routed. Right in front of the passenger rear tire.
 
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Old Jun 20, 2021 | 10:27 AM
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Originally Posted by dustyroad
It shouldn't it is how I have my dual exhaust routed. Right in front of the passenger rear tire.
Thank you! Should I go with 45 or 90 degree turnout?
 

Last edited by Prionus; Jun 20, 2021 at 10:32 AM. Reason: Forgot
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Old Jun 20, 2021 | 10:41 AM
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muffler shop did mine at 45's
 
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Old Jun 20, 2021 | 11:13 AM
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If I exit behind the rear tire, does it go between the mudflap and tire, or behind the mudflap?
 
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Old Jun 20, 2021 | 02:09 PM
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Here's mine, no smell in the truck.


 
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Old Jun 20, 2021 | 02:18 PM
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Originally Posted by Max Capacity
Here's mine, no smell in the truck.

Thank you for the picture. I think I’m going to give that method a try.
 
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Old Jun 20, 2021 | 05:02 PM
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Beware, exiting the exhaust between the body and the road makes it more noisy in the cab.
 
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Old Jun 21, 2021 | 08:43 AM
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Originally Posted by Franklin2
Beware, exiting the exhaust between the body and the road makes it more noisy in the cab.

I'm guessing for his truck, like mine, road noise is not a concern. But thanks for pointing that out for those who use their truck all the time. I have so many other air leaks in the cab...

 
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Old Jun 21, 2021 | 09:05 AM
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Originally Posted by Prionus
I know the original exhaust routed over the rear axle to the back of the truck. I was wondering if dumping the exhaust in front of the rear wheel would be a stinky problem? I currently have what is pictured. I could easily buy a straight pipe and curved piece and run the exhaust to the rear wheel. Or, should I run it to the back of the truck. I don’t want exhaust stink in the no AC truck.

This is no issue unless you see cold climes and have rear disks. You will not be sucking exhaust back into the cab in that location
 
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Old Jun 21, 2021 | 10:03 AM
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Originally Posted by matthewq4b
This is no issue unless you see cold climes and have rear disks. You will not be sucking exhaust back into the cab in that location
Thanks for the positive response. I am going to run it out just in front of the rear tires. Cheapest way to do it too!
 
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Old Jun 21, 2021 | 05:40 PM
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Originally Posted by Prionus
Thanks for the positive response. I am going to run it out just in front of the rear tires. Cheapest way to do it too!
Since I am being negative, I will continue. This is all from my experiences. I have found if you 90 it straight out in front of the rear tires, everything is good, especially if you bring it out beyond the body. But what I have found is all that pipe hanging out there needs support. The one I did like this I had to rig a hanger out there and hang it from the bed sheetmetal. You have a flatbed, so you may find you need to fabricate some sort of hanger from the bed to hang the pipe from. All that pipe out there wants to put a twist on the rest of the system. The regular hangers on the rest of the system won't keep it from wanting to twist and droop.

Just something to be aware of if you run into it.
 
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Old Jun 21, 2021 | 05:53 PM
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Originally Posted by Franklin2
Since I am being negative, I will continue. This is all from my experiences. I have found if you 90 it straight out in front of the rear tires, everything is good, especially if you bring it out beyond the body. But what I have found is all that pipe hanging out there needs support. The one I did like this I had to rig a hanger out there and hang it from the bed sheetmetal. You have a flatbed, so you may find you need to fabricate some sort of hanger from the bed to hang the pipe from. All that pipe out there wants to put a twist on the rest of the system. The regular hangers on the rest of the system won't keep it from wanting to twist and droop.

Just something to be aware of if you run into it.

Typically if you put a hanger on the outside of the frame it will be more than enough to support it.
 
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Old Jun 22, 2021 | 01:14 PM
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Originally Posted by matthewq4b
Typically if you put a hanger on the outside of the frame it will be more than enough to support it.

That has worked for me years ago. You can a hanger from any parts store.

The current set up with just the down turned has worked fine for a number of years.
 
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Old Jun 22, 2021 | 09:26 PM
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I have a turn down on mine infront of the rear axle. It was a temporary fix that will be corrected hopefully soon.
 
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