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Redoing my exhaust

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  #31  
Old 01-04-2012, 07:02 PM
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Here's another one. She sounds like shes going to stall though...

1979 F250 New Exhaust - YouTube
 
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  #32  
Old 01-04-2012, 07:43 PM
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Originally Posted by Sleepy445FE
I would try searching youtube for examples of glasspacks to give you an idea of the sound. It's not any louder than a 40 series it's just a different sound. I like the sound of a straight through muff more than the chambered myself. I run Dynomax Bullets.
I've looked around Youtube, its just hard to get a sense of what they sound like online.


Originally Posted by jgavac
Mine isn't terribly loud. Once you get above 30mph you don't hear it that much (unless you gun it). Sound comes back at about 50-55mph. Once the truck is warm, the sound is slightly louder in the cab (The sound at 10mph gets you rattles )


Here's what mine sounds like. 36" long muffler, 2 1/4 pipes stepped to 2 1/2 for muffler, no cat, 2-1 system
In Cab and out of '79 F250 w/glasspack - YouTube


The shape of the glasspack will have affect how it sounds. Long and smaller diameter (say, 36" by 4" diameter body) will have a deep rumble at idle. A shorter, larger diameter one (12" by 5" diameter body) will have a sharp crack when the engine is revved.


Jameson
That sounds pretty good


Originally Posted by jgavac
Here's another one. She sounds like shes going to stall though...

1979 F250 New Exhaust - YouTube
I hate it when my truck stumbles like that


I'll keep looking for a little while. Looks like I won't have the money together for a few months anyway.
 
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  #33  
Old 01-06-2012, 02:20 PM
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Since it's the weekend and I've got nothing else to do, I may take Jameson's approach and temporarily rearrange my system. Just have both pipes dump out in front of the passenger's side rear tire.


Also noticed a while back that one of the tailpipes was pushed back a good 3 inches from when I got rear-ended by a classmate. Crimped the pipe where it bends over the axle
 
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  #34  
Old 01-06-2012, 05:53 PM
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Got everything off. Lots and lots of rust.

Kinked pipe:


Rusty 40 series:


All out:
 
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  #35  
Old 01-06-2012, 06:17 PM
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Whoa that kink was a major restriction!! That rust doesn't seem all that bad. When I first got mine the exhaust system was practically flaking apart with rusted through muffs.
 
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  #36  
Old 01-06-2012, 06:30 PM
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The outside is the good part, its the inside thats all rusted out.
 
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  #37  
Old 01-06-2012, 07:23 PM
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Originally Posted by Sleepy445FE
I would try searching youtube for examples of glasspacks to give you an idea of the sound. It's not any louder than a 40 series it's just a different sound. I like the sound of a straight through muff more than the chambered myself. I run Dynomax Bullets 4"x16"
They might sound good with your engine, but they'd make my truck start to fart if I put the pedal to the floor. I don't know if it's the compression ratio that does it? But to me glasspacks or any straight through muffler sounds like s*** on these engines in stock form. Now on the engines in the gt40 mkII's, then those mufflers sound good.
 
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  #38  
Old 01-06-2012, 08:14 PM
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Welded a piece of tube through the cat.


A few other modifications, and I've got the cat and muff tacked up


Realized the muffler is running too close to the driveshaft so I hung up the tools till tomorrow.



I need to unbolt the pipe from the manifolds so I can weld everything solid. Is there a gasket on there that I'm gonna have to replace?
 
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  #39  
Old 01-07-2012, 07:39 AM
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I've read that if not all, some engines didn't have gaskets for the manifolds. I'd put some on though if you take them off, quality ones though.
 
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  #40  
Old 01-07-2012, 09:11 AM
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Mine didn't have any. I decided not to put any in when i finished my swap. No problems yet. If you don't, make sure the flange bolts are nice and tight
 
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  #41  
Old 01-07-2012, 09:49 AM
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Originally Posted by jgavac
Mine didn't have any. I decided not to put any in when i finished my swap. No problems yet. If you don't, make sure the flange bolts are nice and tight
Ok, thanks.
 
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  #42  
Old 01-07-2012, 03:37 PM
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All done

Welded up


Installed


1979 F150 with Flowmaster 40 Series Muffler - YouTube
 
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  #43  
Old 01-07-2012, 09:10 PM
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Interesting drone. Is that just the way the camera recorded it?
 
Last edited by jgavac; 01-07-2012 at 09:19 PM. Reason: changed wording
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  #44  
Old 01-07-2012, 09:16 PM
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Sounds good. Are those factory slots? They look nice.
 
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  #45  
Old 01-07-2012, 09:38 PM
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Originally Posted by JB78f150
Sounds good. Are those factory slots? They look nice.
My neighbor across the street has them factory slots on his 81 F100... I've been eyeballin' 'em lately... hmmm.. would need to make more space.
 
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