Has anyone had a problem with this? Mine burned a hole thru the carpet, thru 2 layers of insulation. After lowering the mufflers , you can still not touch the floor as its still way hot.
Sounds like your running your motor waay too lean.. Fatten up the jetting on your carb!! And redo the timing... I'm running a set of Flowdaddys on my '91 Fox car and never had that problem...
That's what I have on mine and they're still freakin' loud... Must be that .542" lift cam I'm running..
Yeah, that sounds like a likely source of the problem. At the very least get a tuning expert to look at that jetting and timing, and don't be disdainful of the use of an exhaust gas analyzer to sort it all out.
Some cars seem to do that. It may be lean jetting. It also may be the way the air flows under your car. Heat shields may be needed.
Really, you guys determined the condition of his engine by this diagnosis? So tired of hearing "lean" conditions for every ailment. Seriously; hot mufflers are not uncommon. Flowmasters take the sound wave energy and reflect them against each other and that causes heat. Therefore, this type of muffler will always run hotter than "traditional" mufflers. If your floor insulation/carpet is burning because of this, the mufflers are far too close to the floor. Use a one hand rule. You should be able to able to get one hand between the exhaust and the floor at a bare minimum.
I can't resist this anylonger.... The wrong weight oil in the muffler bearing can cause overheating. unless it's the multiple bearing design that uses silicon grease.
I run them on the woodie without problems. Of course they are wrapped with thermal wrap and there are two layers of foil/bubble insulation under the fiber pad and carpet. I would think that if the muffs are getting that hot you'd see problems under-hood also. Are you running headers? If you are running headers that are thermal wrapped it's possible that it's carrying the heat further into the exhaust system and the first "outlet'' for all of that heat is the mufflers.
They also run hotter the closer they are to the motor. Not much, but it does make a difference. What kind of insulation are you using?
Could be a timing issue...If your engine timing is retarded even a few degrees, your exhaust will run way hot. Check to see if your headers or manifolds are glowing at high RPM...
Just wait a few months, you'll be glad for the heat. Seriously....yeah, mufflers get hot. Yeah, engine tune can affect how hot they get, as well as other variables. Pictures?
Flowmasters on the Buick are spray bombed black and they havent gotten hot enough to wrinkle the paint. Maybe you have a mouse nest in there
OK, I read every response and no-one suggested this. Flowmasters will run blistering hot and burn flooring even when properly spaced from the floor if they're installed BACKWARDS. They are directional, and it's very important they get installed correctly. I had a car that with no interior was smoking the POR 15 off the floor on one side only. THAT Flowmaster was installed backwards....and the prob gone after I switched it around
The "1 hand" rule is what we used when I worked in muffler shops. If you can pass your hand between the pipe, muffler and whatever, you should be okay. Bob
You're right...the big orange INLET sticker needs to go towards the front of the car. I forgot all about that.
Well the solution has not been arrived at yet. But I think this is the solution I'm going to be using. http://www.spintechmufflers.com/700...000-round-cruiser-series-muffler/cat_120.html It will solve proximity problems. I need to get under the car and take some measurements. Mufflers are not in backwards, I think they're just too close to floor, and I have seen some stuff on the web about them running hot too. Also will be installing AFR gauge so that should help with getting mixture right as well , should that be part of the problem.
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