I was wanting to put flame throwers on my 302 F-150. I got spark in the dual exhuast and I have sparks fly out when I floor it and let but no flames. Need Advice!!!!!!!!!!!!!!!!!!!!!!!!! 1995 ford f-150 electronic fuel injection dual exhuast comes out in front of rear wheels. headers and superchip installed????????????????

 

Sounds like you just have some super-heated carbon build up in the exhaust. Might be running rich(02 sensor). Try pulling some codes.

Don't know about Flame Throwers but I can hook you up with an AfterBurner.

 

So you have the plugs in the pipes? If you still have the cat you won't be getting flames.

 

Hmmmmm, I guess by that last post, he was serious. LOL

 

yeah, i think he is.

eric is mostly right. if you have a cat, you'll never throw flames because it'll burn/convert all fuel and fumes before it ever gets back to your plugs. however, for this to have worked in the first place, you need to get raw fuel down the pipes. kits i have seen for pre-cat vehicles do this by having a switch that kills spark to the engine. the engine then pushes the unburnt fuel/air mix down the exhaust pipe where the spark from the plugs lights it up.

if you have a cat, however, this is a VERY bad idea!!! raw fuel in a cat will kill it really fast, and could be dangerous. temperatures in a cat get much higher than you'd think. you may get a combustion where you don't want it.

Mike

 

dual exhuast with long tube headers and straight to the tips that come out in front of the rear tires I have two spark plugs one in each pipe. two coils one to each plug all run off the negitive coil on pickup. I have black smoke when I floor it and let off I have black smoke and white plus spark when I floor it and let off. Maybe more fuel needed or somthing

 

uhm, ok. so does that mean you DON'T have cats? how are you getting fuel back to the plugs, and what do you mean you have them running "off the negative coil on pickup?"

Mike

 

coil has two wires one as a postive and negtive I ran off the negtive wire to my first coil to the next going postive to negtive using the last negtive grounded to the truck. NO cats NO muffers, Headers stright pipe and tips. Runs a little rich so I thought I could get it to spit flames but I guess I don't have enough fuel in exhuast? How can I get more in the exhuast? We got it to work on a truck that my cousins have with same everything but no headers.

 

couple things:

1) how are you killing the ignition on the truck when you go to light off the flame throwers? or are you just setting it to run really rich? i would imagine you need to cut the trucks ignition completely so that it pushes down ALL the fuel, not just what's left

2) wiring to the negative side of the coil shouldn't get you anything. you need a "HOT" source, preferrably from the battery using some good thick wire and a switch

3) by daisy-chaining the coils, you've put them in series. you probably need them to be in parallel.

Mike

 

It all works because you can look into the tips and see a blue sparks off the spark plugs but no flames? I don't have it running rich I was told it was running rich because I had black smoke. How do you kill all the sparek to the motor but get flames and don't kill the motor all together

 

Correct, with two coils and one runing piggy back, the first will take all the juice.

and you need to get the spark away from the cylinders, the EFI is set so its efficiant and when everything is right there's no fuel(not enough) to get anything to light.

If you want flames, first ditch the EFI and get a carb then you yourself can controll the fuel entering and leaving the engine, getting things to work with an EFI setup is like getting water from a rock

 

well, without cats, you may very well be running rich, but just not rich enough to light off anything.


i'm thinking back to an old episode of Trucks! when they put a kit in an older truck. the kit used some sort of relay that killed the juice on the low side on the trucks ignition coil. it then diverted the 12V from the low side of THAT coil to the rear coil(s) for the flamethrowers.

so, the kit worked like this:

1) gun the engine

2) flip the switch connected to the relay. it kills the 12V going into the truck's coil and sends it back to the coils in the rear, giving you spark. at that point, the engine is not burning the fuel. instead, it just pushes it out the exhaust. this gives you the extra fuel you need to light off

3) when you're done, flip the switch back, which sends spark back to the truck's coil. the flames will stop, and as long as the engine is still spinning at an RPM it can idle at (or greater) it should just start running again

even though you can see spark on the 2 plugs, i can almost guarantee you need to re-wire the 2 coils in the back to be in parallel. that 2nd coil is only getting 1/2 the voltage the first one is seeing, which means less or no spark.

Mike

 

Relay help what kind of relay and how do I wire it

I will rewire the coils as you said

 

OK. thought about it.

not sure EXACTLY what kind of relay you need. hopefully someone with more electric smarts than i can figure this out. basically, all you need to do is have the ability to take one 12V power source and divert it it occassionally.

i guess if you didn't wanna be that slick, you could just put the two igintion systems on their own switches, one for the truck and one for the flamethrowers. you'd have to stich the truck's off, then switch the flame's on, then vice versa once you're done. not as cool, but effective.

someone else help me remember here. the INCOMING voltage (low side) of a coil is just plain old 12V, right? you don't need a mega-heavy gauge wire or anything, right?

Mike

 

First off, the following information is education purposes only. I assume no liability in its posting and highly recommend that you do no pursue actual installation. You assume all liabilites and legal reprecussions should you choose to flagrantly ignore my advice and actually install this.

Note 1: 'Flamethrowers' are not good for your engine. Raw gas will leak down the sides of your pistons and into your oil, eventually killing your engine.
I HIGHLY recommend against installation of Flamethrowers.

Note 2: 'Flamethrowers are stricly for off road use with no people or objects within 25 feet of your vehicle when ignited.
I HIGHLY recommend against installation of Flamethrowers.

Note 3: "Flamethrowers may be illegal. Check your local & state ordinances.
I HIGHLY recommend against installation of Flamethrowers.

Note 4: Gutting or removing your cat IS against the law!
I HIGHLY recommend against installation of Flamethrowers.

There, now that my butt is covered...

Got to the autoparts store and get a momentary contact single pole switch and a bosch change over relay. Wire the negative sides of the two tailpipe coils together and back to the engines coils negative side. Break open the positive side of the engines coil wire. Wire the 12v side to pin 30 of a bosch change over relay. Wire the engines coil positive side wire to pin 87a. Wire the tailpipes coil positives to pin 87. Wire Pin 85 to ground. Wire pin 86 to one side of a momentary contact single pole push button switch. Wire the other side of the switch to acc12v (only 12v if ignition sw is on).

When you push the button, it activates the relay which sends 12v to the tailpipe coils and shuts off the engines coil; can't get more rich running than that. When you let up on the switch, the relay is de-energized and power is routed back to the engines coil.

Don't blow yourselves up and someone owes me a sixpack.