Blowing up mufflers
Thread Starter
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Blowing up mufflers
My friend has a 74 F250 360 C6 all stock, and in the last two weeks it has blown up two mufflers. Opened them up like a can opener. I told him that the only way that I knew that to happen was letting off the gas, shutting off the ignition and refiring it.
What do you guys think is causing the muffler destroying action?
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
What do you guys think is causing the muffler destroying action?
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Thread Starter
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Blowing up mufflers
Thanks Greg, but I'm looking for cause suggestions, got any?
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Freshman User
Joined: Mar 2000
Posts: 32
Likes: 0
Blowing up mufflers
John,
My '67 F100 was backfiring explosively on trailing
throttle. If the pedal was down about halfway or
more and then suddenly released, she'd let off
a blast that made me think the floor was going
to blow. Oddly enough it was running too lean.
After enriching the idle mixture the proplem has
almost completely gone away. It'll still backfire
a bit, but nowhere near like it was before.
Scotty
My '67 F100 was backfiring explosively on trailing
throttle. If the pedal was down about halfway or
more and then suddenly released, she'd let off
a blast that made me think the floor was going
to blow. Oddly enough it was running too lean.
After enriching the idle mixture the proplem has
almost completely gone away. It'll still backfire
a bit, but nowhere near like it was before.
Scotty
Elder User
Joined: Jun 1999
Posts: 940
Likes: 0
From: LAT 46.55501° & LON -122
Blowing up mufflers
You might tell him to try a different brand muffler. I went through about 3 $10 turbo mufflers on my F250 in a 2 week period before buying more expensive ones; no blow-outs yet.
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
Blowing up mufflers
exhaust back fire is usually from running too rich. Also check the timming and tune of the engine. On the FE the 7 and 8 fire in a row and the wires tend to touch. Make sure the back two wire on drivers side are seperated.
You can get a cap-adapt from the parts store that will use the larger HEI type wires to help with cross-firing. Also a welded seam muffler is best.
You can get a cap-adapt from the parts store that will use the larger HEI type wires to help with cross-firing. Also a welded seam muffler is best.
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Thread Starter
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Blowing up mufflers
Thanks Guys, He has installed new points, the others were closed and adjusted the carb.
Seems to be holding for now. ;-)
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Seems to be holding for now. ;-)
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
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Posting Guru
Joined: Jan 2000
Posts: 1,899
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From: Cullman Alabama
Blowing up mufflers
John, One of my friends put a new set of lifters in his truck, and it did that. Some of the lifters were shorter that others. At any rate, He's getting too much raw fuel in the muffler before he gets ignition.
Isnt that how you start the Jet, ROtate, Fuel, Ignition....
Maybe they just dont make mufflers like they used to?
Isnt that how you start the Jet, ROtate, Fuel, Ignition....
Maybe they just dont make mufflers like they used to?
Thread Starter
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Blowing up mufflers
Could be, the way that thing was split there was an explosion of sorts in there for sure.
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
John
jowilker
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Senior User
Joined: Oct 2000
Posts: 219
Likes: 0
From: Richmond USA
Blowing up mufflers
John, weak valve springs will cause that.
At highways speeds if he feels the engine loose power for a second before the blow out.
Dre'
1978 F-150, 460ci(750cfm,Edelbrock Performer,Dynomax Ceramic Coated headers,etc.)Auto-C6,3:70.1 - 9" Posi.
At highways speeds if he feels the engine loose power for a second before the blow out.
Dre'
1978 F-150, 460ci(750cfm,Edelbrock Performer,Dynomax Ceramic Coated headers,etc.)Auto-C6,3:70.1 - 9" Posi.
Thread Starter
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Blowing up mufflers
Thanks guys, he fixed it last fall. :-)
John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group
66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group
66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
