Exploding Mufflers
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Exploding Mufflers
Posted: July 08 2007 08:40 PM
 
Jim Hardy (aka farmer) [ View ] [ vhardy@adams.net ] [ Car Ads ] [ Blogs ]
Carthage, Illinois
(217) 845-3721
 
My wife and daughters and 2 horses just returned home from Oklahoma with just the muffler baffels the cases were blown off in western Missouri on the way home. Seems sort of funny now but yesterday not so much.


The question is what cased them to explode. The truck is a 79 GMC Crew Cab with a rebuilt (15k miles) 454, RV cam, Edlebrock intake and carb, MSD 6al ignition, accel distributor. No problems until yesterday, temps in the mid 90's running 60-65mph (her story) rpm's in the 27-2800 range.


After having the muffler casings removed she statrted the truck and drove 5 hours home with no problems.


The mechanic who came out suggested bad gas, I thought maybe timing/ignition.


Any ideas?


Jim
 
 
Comments
 
Posted by robymarks  -  07/08/2007 08:55 PM
It sounds like it stopped firing for a second then came back on. The system loads with full, then backfires. It will destroy the mufflers. It could be in the ignition. I would check the that ignition good before proceeding. Good Luck and just my 2 cents. Don't ask me how I know.
robymarks [ View ] [ Email ] [ Blogs ] [ Car Ads ] Houston, Texas Charter Member since October 2005
 
Posted by dixie  -  07/08/2007 09:11 PM
You know it could b just a old worn out muffler , i don.t think it was a flowmaster {was it } you know how much heat that thing gets in it, an your towing with it too. one on my p/u is 11 yrs old an i,m just waiting on it to go. Just my i cents worth.
jim grace [ View ] [ Email ] [ Blogs ] [ Car Ads ] dade city, Florida Charter Member since January 2006
 
Posted by bigdude  -  07/08/2007 09:33 PM
I have had them swell up like a balloon after a backfire before- usually from too much heat and bad gas or ignition hiccup.
resident know it all [ View ] [ Email ] [ Blogs ] [ Car Ads ] Three Rivers, Michigan Charter Member since January 2004
 
Posted by wfd2  -  07/08/2007 09:48 PM
Was she in corn country when it happened? Tank full of E85 or gas with a high ethanol content might cause a lean miss, loading the exhaust with un-burnt fuel.
wfd2 [ View ] [ Email ] [ Blogs ] [ Car Ads ] brunswick, Ohio
 
Posted by APLUS  -  07/09/2007 07:05 AM
robymarks, I know how you know ............. I did the same thing back in my younger (dumber) days.
APLUS [ View ] [ Email ] [ Blogs ] [ Car Ads ] Austin, Texas
 
Posted by farmer  -  07/10/2007 04:33 AM
Thanks for all the replys. The tank she was using when they blew is still half full so I'll give it a test run and see what happens.
farmer [ View ] [ Email ] [ Blogs ] [ Car Ads ] Carthage, Illinois
 
Posted by hotrodfreakcomcastnet  -  07/11/2007 04:47 AM
i borrowed a buddys towtruck one time , a ford with a point ign 390 the dang thing hesitated ona bridge climb and blew both mufflers to bits. i replaced them to keep piece man that was a exspensive borrow!
hotrodfreakcomcastnet [ View ] [ Email ] [ Blogs ] [ Car Ads ] Salem, New Jersey
 
Posted by farmer  -  07/12/2007 04:12 AM
Well I drove and DROVE IT and it doesn't seem to be the gas, no ignition problems, and the timing hasn't changed. It's starting to look like a string of unfortunate events.


New steel case mufflers going on Saturday.


Thanks agian for all the input.
farmer [ View ] [ Email ] [ Blogs ] [ Car Ads ] Carthage, Illinois
 
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