Recently if decided to add a flaming exhaust to my truck. Looking around I found two really good ways to do it. None of them were on FTE. So here is a thread that explains how to do it.

<O

Warning Danger could ensue if you’re not careful. You should take it to a professional if you don’t understand any of the instructions. Please read them all before attempting. Disconnect the battery, and remove before working with propane. Use common sense. You’re working with explosive and flammable pressurized gas. Don’t kill yourself or anybody else. Don’t use them on the road or near flammable objects (i.e. Dry Fields, other cars or PEOPLE). NEVER RUN THIS MOD WITHOUT ENGINE ON.

 

You could purge the fuel from your engine by shutting down your ignition for a few revolutions, or you could inject propane into your pipes past the cat converter.
<O

The first method is tested, and works very well for producing big flames.
It has its drawbacks though.
- It can be really expensive. Some kits cost over $500.
- It WILL wear out your engine faster. You dissolve the oil when you do it.
- Your car won’t pass emissions in some states.

The second method has its drawbacks too.
- The propane can be dangerous, even when not in use. You could suffer from a flashback, and literally blow your pipes off your truck. (Yea, that'll happen)
- It too costs about $100 dollars to do right.
<O</O

I chose the second way, mainly because my turbo wouldn't handle raw gas flowing over it too well.

 

So here's what you’re going to need.
First and foremost, you'll need to figure on the flame size you want. Mine are generally 3-6 foot. This will determine the size of the materials needed. You will need a propane tank, either that of a small lantern (single exhaust, 1-4 foot) or a gill tank for dual exhaust pipes.

Now I did the dual setup, but I’d imagine the single setup would just have smaller parts. I ebayed a solenoid for about $40, and I used a regulator off of one of those weed burners. I ran a tube from the regulator to the solenoid. Then from the solenoid to each of the pipes using a y connection. You need to insulate the solenoid from the heat of the exhaust. To do this, I ran all the tubes as a rubber. It could withstand the temps of 750, so I figured that would work. I used all brass fittings, because they wouldn’t corrode from water damage, and wouldn’t react with propane. Once you have all the piping done, connect the tank and look for leaks. (Ensure the solenoid is closed first). It can be smelt real easily, so don’t leave it connected if you smell propane. Fix all propane leaks before continuing.

Next you have to do electrical. Keep the battery disconnected. Now you’ll need a sparkplug for each pipe. Then you’ll need a coil. Run the wire from the power source to the coil to the plugs. In between the power source and the coil, you’ll need to put a relay. Your plugs should be about 3-9 inches from the end of your exhaust. You’ll need to replace (or clean) them every 10,000 miles, so put them in a good spot.

For the activation, I used a switch, and a button. I must turn the switch on, before I can press the button to activate the flames. The power goes through the switches, into the relay, the solenoid, a 15amp fuse and to a ground. Once the wiring is done, check for errors, and place the battery in. test the circuit. You should have sparks jumping out your plugs. If not, try grounding your exhaust. This should solve the problem. A stainless steel, setup will need a washer on the plug, and a grounding wire laid form the washer. After you have the plug sparking, ensure that your solenoid opens and closes when you add power to it.

When all electrics work, you need to make a “nozzle” I’ll show you a picture of this as soon as I can. It’s really quite simple; you’ll need something to introduce oxygen into the fire for a brighter, bigger flame.

You’re almost there. Start your truck, and take a drive (without the propane), come home and let it cool. Make sure you let it cool, and inspect everything to ensure there is no damage from heat. Once everything checks out, hook you propane up, and turn your regulator to 1/3 open. Start the truck up, and warm up the exhaust. Activate the propane in a safe area, and have someone on hand with a fire extinguisher. The person isn’t to put out a fire so much as to tell you weather you need the flames longer or shorter. Adjust as necessary, but don’t try and go too big. We don’t want exploding trucks here.

If anyone can think of improvements let me know. I’m sure there’s stuff I missed.