Flame Thrower kits
Seasoned Member
Joined: Sep 2009
Posts: 373
Likes: 0
From: Everett, WA
Year: 1990
Model: Cherokee
Engine: 4.0l
Yeah when I was a kid I saw lots of these setups. I've never seen one on a EFI motor though, just a carb motor. A carb motor will continue to suck gas as long as the motor is turning, where a EFI motor will cut the fuel if the ignition is off and the exhaust shouldn't have any unburned fuel in it. Has anybody done this to an EFI motor? just curious
The trick was to get up to cruising speed, leave it in gear and turn the ignition off. This basicly fills your entire exhuast with unburned fuel. Turn your ignition back on(being careful not to grind your starter gear) stomp the skinny pedal and ground the rear plug at the same time. Loud as hell bang and a flame that'll make anybody back off! By charging your exhaust up you have a flame that lasts and goes further out the more you accelerate. You can do it too by revving the motor, but its more of a flash flame. Either one is fairly dramatic at night!
I've blown up a couple mufflers doing this, so there is a bit of risk if you don't do it right. Peeled one open like a banana. Your susceptible to this if your exhaust valves are leaking.
lol...I didn't even know they made kits for this, we always made our own. Seein as how only a couple guys even know what this is, your makin me feel like a dinosaur
The trick was to get up to cruising speed, leave it in gear and turn the ignition off. This basicly fills your entire exhuast with unburned fuel. Turn your ignition back on(being careful not to grind your starter gear) stomp the skinny pedal and ground the rear plug at the same time. Loud as hell bang and a flame that'll make anybody back off! By charging your exhaust up you have a flame that lasts and goes further out the more you accelerate. You can do it too by revving the motor, but its more of a flash flame. Either one is fairly dramatic at night!
I've blown up a couple mufflers doing this, so there is a bit of risk if you don't do it right. Peeled one open like a banana. Your susceptible to this if your exhaust valves are leaking.
lol...I didn't even know they made kits for this, we always made our own. Seein as how only a couple guys even know what this is, your makin me feel like a dinosaur
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
Yeah when I was a kid I saw lots of these setups. I've never seen one on a EFI motor though, just a carb motor. A carb motor will continue to suck gas as long as the motor is turning, where a EFI motor will cut the fuel if the ignition is off and the exhaust shouldn't have any unburned fuel in it. Has anybody done this to an EFI motor? just curious
The trick was to get up to cruising speed, leave it in gear and turn the ignition off. This basicly fills your entire exhuast with unburned fuel. Turn your ignition back on(being careful not to grind your starter gear) stomp the skinny pedal and ground the rear plug at the same time. Loud as hell bang and a flame that'll make anybody back off! By charging your exhaust up you have a flame that lasts and goes further out the more you accelerate. You can do it too by revving the motor, but its more of a flash flame. Either one is fairly dramatic at night!
I've blown up a couple mufflers doing this, so there is a bit of risk if you don't do it right. Peeled one open like a banana. Your susceptible to this if your exhaust valves are leaking.
lol...I didn't even know they made kits for this, we always made our own. Seein as how only a couple guys even know what this is, your makin me feel like a dinosaur
The trick was to get up to cruising speed, leave it in gear and turn the ignition off. This basicly fills your entire exhuast with unburned fuel. Turn your ignition back on(being careful not to grind your starter gear) stomp the skinny pedal and ground the rear plug at the same time. Loud as hell bang and a flame that'll make anybody back off! By charging your exhaust up you have a flame that lasts and goes further out the more you accelerate. You can do it too by revving the motor, but its more of a flash flame. Either one is fairly dramatic at night!
I've blown up a couple mufflers doing this, so there is a bit of risk if you don't do it right. Peeled one open like a banana. Your susceptible to this if your exhaust valves are leaking.
lol...I didn't even know they made kits for this, we always made our own. Seein as how only a couple guys even know what this is, your makin me feel like a dinosaur

The kit I build has nothing to do with the vehicle moving. I actually reccoment you DON'T move when doing it, as its much safer, and legal.
Yes, it can be done on EFI vehicles. My buddie has a '98 Camaro that'll push 5' flames out of both tail pipes. Another friend is installing it on his 2002 Camaro over the winter.
No, if you do the install correctly, you will not loose fuel, just spark. This is why my kit works while not moving. You flip a switch which arms the plugs in the exhaust, you rev the motor up, press a button which cuts spark and not fuel, you keep your foot on the pedal allowing the injectors to keep working, which then sends the unburnt fuel through the exhaust to the spark, then it ignites.
In all reality its smarter to not dump the exhaust under the truck, especially for slower moving off road vehicles. If its let loose under the truck, you'll be inhaling fumes all the time. But that is off topic and none of my business.
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
Senior Member
Joined: Mar 2010
Posts: 718
Likes: 0
From: Miami,Fl
Year: 1998
Model: Cherokee
Engine: 4.0 L6 Srt
I would get the kit.. Since im already in the process of the true dual exhaust.. This would top it off nicely.. One pipe coming out on each side of the jeep with outward flames...
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
I was thinking about pricing it at $160 with coils, plus shipping/paypal fee (dunno what that is gonna add up to be, but things can be worked out).
I guess I'll be starting a for sale thread here in the next few days. I still gotta get a pic of the kit.
Duals out the sides would look bad ***. If we do hook up on this, you'll HAVE to post a pic/vid of your Jeep popping flames!!!
Last edited by Gee oh Dee; Nov 30, 2010 at 11:52 AM.
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
I forgot to mention that different options in color are available, as well as lighted/non-lighted kits and different toggle switches.
But that is more for the actual sale thread. Just wanted to put that here for those interested.
Once I get the actual thead going, I'll post a link here for ease.
But that is more for the actual sale thread. Just wanted to put that here for those interested.
Once I get the actual thead going, I'll post a link here for ease.
Junior Member
Joined: May 2010
Posts: 72
Likes: 1
From: lennon, mi
Year: 2001
Model: Cherokee
Engine: 4.0
if you are going to design a flame thrower kit, think about this....instead of cutting the spark to the plugs in order to gain the rich mixture (know quite a few hot-rodders with throwers, and they generally have to change their oil after a demonstration due to the cylinder washdown) install an injector as well as the spark plug in the tail pipe... keep the motor running properly, and it will also give you more flame...(think 10-20 feet vs 5)
this is the way a buddy of mine with a 50 merc runs his.
this is the way a buddy of mine with a 50 merc runs his.
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
if you are going to design a flame thrower kit, think about this....instead of cutting the spark to the plugs in order to gain the rich mixture (know quite a few hot-rodders with throwers, and they generally have to change their oil after a demonstration due to the cylinder washdown) install an injector as well as the spark plug in the tail pipe... keep the motor running properly, and it will also give you more flame...(think 10-20 feet vs 5)
this is the way a buddy of mine with a 50 merc runs his.
this is the way a buddy of mine with a 50 merc runs his.
However, I could also build identical kits as all the big name sellers and sell them for much cheaper.
I can also do color matching (some limitations), lighted vs non-lighted kits, and options for switches.
I guess do whatever you want.
You'll still need things to power the extra injectors, not to mention extra fuel lines, pump to pump the fuel to the injectors, probably resistors and plenty of other crap. No where near as easy as my kit. But like I said, do what you want.
And as long as you aren't shooting flames for 10 minues straight at one sitting, no oil change is necessary. You don't instantly wash down cylinders, otherwise anytime anyone had a misfire of any injector they'd be doing oil changes.
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
Thread Starter
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check


