# exhaust flame thrower

N

#### ngdbud

Jan 1, 1970
0
Could I make a simple exhaust flame thrower for my mini bike without a
$100 kit? I'm thinking of just putting in an SPDT momentary rocker switch (if there is such a thing) that can redirect the electricity from the engine to a spark plug in the exhaust. The kind of switch I would need would be switch that is always on in one setting and then springs back after I press it to a different setting. Do they make these? on (except when pressed) --------------_____------(> engine spark plug switch -------(> exhaust spak plug momentary If that makes any sense. T #### Tom Biasi Jan 1, 1970 0 ngdbud said: Could I make a simple exhaust flame thrower for my mini bike without a$100 kit? I'm thinking of just putting in an SPDT momentary rocker
switch (if there is such a thing) that can redirect the electricity
from the engine to a spark plug in the exhaust. The kind of switch I
would need would be switch that is always on in one setting and then
springs back after I press it to a different setting. Do they make
these?

on (except when pressed)

--------------_____------(> engine spark plug
switch -------(> exhaust spak plug

momentary

If that makes any sense.

Do a search for a SPDT momentary contact rocker switch with a 15,000 volt
rating.

R

#### Roger Dewhurst

Jan 1, 1970
0
ngdbud said:
Could I make a simple exhaust flame thrower for my mini bike without a
$100 kit? I'm thinking of just putting in an SPDT momentary rocker switch (if there is such a thing) that can redirect the electricity from the engine to a spark plug in the exhaust. The kind of switch I would need would be switch that is always on in one setting and then springs back after I press it to a different setting. Do they make these? Are you looking for a bloody great backfire from the exhaust pipe or do you really want a flame thrower? R J #### Jasen Betts Jan 1, 1970 0 Could I make a simple exhaust flame thrower for my mini bike without a$100 kit? I'm thinking of just putting in an SPDT momentary rocker
switch (if there is such a thing) that can redirect the electricity
from the engine to a spark plug in the exhaust. The kind of switch I
would need would be switch that is always on in one setting and then
springs back after I press it to a different setting. Do they make
these?

on (except when pressed)

--------------_____------(> engine spark plug
switch -------(> exhaust spak plug

momentary

you'd need a switch that can switch the thousands of volts that go to the
spark plug. you could possibly use an autombile disttributor.

you'd need to attach a lever to the input shaft to to turn it sufficiently
to switch to the other plug.

S

#### steamer

Jan 1, 1970
0
--Funny you should mention this. Last weekend, I think it was
on Spike TV on one of the truck shows they showed how to do this. You
might snif around over there. I'm planning something similar for an art
car project. Another place to ask would be over at tribe.net in one of
the pyro or art car tribes.

R

#### Rich Grise

Jan 1, 1970
0
Could I make a simple exhaust flame thrower for my mini bike without a

Cheers!
Rich

N

#### ngdbud

Jan 1, 1970
0
steamer said:
--Funny you should mention this. Last weekend, I think it was
on Spike TV on one of the truck shows they showed how to do this. You
might snif around over there. I'm planning something similar for an art
car project. Another place to ask would be over at tribe.net in one of
the pyro or art car tribes.

--
"Steamboat Ed" Haas : Whatever happened
Hacking the Trailing Edge! : to Tom Nelson?
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

Thats exactly the show I saw that set me on this path. I checked out
the kits he was talking about, there $100 daollars. That sounds like way too much money just for a kit to divert electricity from an engine coil to rear coils. There maust have been some sort of driver involved with the kit, but still, it shouldn't cost that much. I saw that show just before going to a supercross event with Bubba Stewart, Ricky Carmichael, Jeremy McGrath, Chad Reed, every body. It was so cool. N #### ngdbud Jan 1, 1970 0 Depriveing the engine of power is the only way this works. Without a spark a perfectly measured air fuel mixture is sent through the exhaust pipe to be burnt near the end of this journey. Your supposed to rev the engine up to a high rpm and press the switch. Momentum will keep the engine going long enough to get a good flame; so if you can shoot flames for about a second to keep the engine from stalling (at least for a minibike like mine, for a car you could go longer). I had a course for a couple of weeks in small engines. There electrical system works a magnet IN THE FLY WHEEL being sent past a small coil to generate the high voltage, so yes, the first spark would be lost in the switch but each spark after would light it up. N #### ngdbud Jan 1, 1970 0 A side thought, what if youwere doing this with a v8 engine. could power be cou to just 4 cylindars and have them pump gas while the other four run the engine so you can get a continuos flame? J #### JeffM Jan 1, 1970 0 if OP thinks he can do this for less than$100.00, he's in dreamland.
Rich Grise

On a 40-year-old car with a carburator and Kettering ignition
it would be duck soup.

Rig a pull-choke
(maybe $4;$0 if you have an old lawnmower for parts).
Add a 2nd ignition coil (maybe $10--less from a junkyard). Rig a SPST switch that cuts primary juice from the main coil and diverts it to the tailpipe coil. (The points are hooked to both coils.) Mount the 2nd coil near the tail pipe so the high-voltage lead can be short. (1 ft of used spark plug wire:$0)
(Used spark plug: $0.) J #### Jasen Betts Jan 1, 1970 0 Yes, there are momentary rocker switches, but you wouldn't want SPDT, because then your motor wouldn't fire. if the motor fires there's no fuel going into the exhaust. Bye. Jasen S #### Serious Machining Jan 1, 1970 0 If anyone not familiar with this device is interested in seeing and hearing it in action, go to this web site: http://www.flamekitz.com// C #### cbm5 Jan 1, 1970 0 Serious said: If anyone not familiar with this device is interested in seeing and hearing it in action, go to this web site: http://www.flamekitz.com// I used to think that putting a 4-inch exhaust cap on 1.5-inch pipes from a 1.6 liter engine was the epitome of mental retardation, but at least that wasn't dangerous. I nearly choked on my lunch seeing the photos of that miserable Honda Civic. Not satisfied with merely installing fart cans, these "gearheads" are now LIGHTING the farts. The first time someone singes my grille, I'm ramming. R #### Rich Grise Jan 1, 1970 0 On a 40-year-old car with a carburator and Kettering ignition it would be duck soup. Rig a pull-choke (maybe$4; $0 if you have an old lawnmower for parts). Add a 2nd ignition coil (maybe$10--less from a junkyard).
Rig a SPST switch that cuts primary juice from the main coil
and diverts it to the tailpipe coil.

But why do you want to cut the juice to the motor coil? You
want your motor to quit while you're trying to blow flames
with its exhaust?

Thanks,
Rich

J

#### JeffM

Jan 1, 1970
0
why do you want to cut the juice to the [engine's] coil?
You want your [engine] to quit
while you're trying to blow flames with its exhaust?
Rich Grise

Yup.
Someone else already mentioned rotational inertia.
(Actually, you don't push in the clutch.)
You want the fuel/air to get thru the engine UNBURNED.

A

#### Alan B

Jan 1, 1970
0
But why do you want to cut the juice to the motor coil? You
want your motor to quit while you're trying to blow flames
with its exhaust?

Precisely. If the OP's mini-bike has a carburetor and an engine kill
switch, he needs no mods. While riding, kill the ignition for a
second or two, blip the throttle, and re-engage the ignition. Kaboom!
Now of course, the reduced lifetime of the exhaust system must be
considered as part of the overall cost.

A

#### Alan B

Jan 1, 1970
0
What you really need is another
coil, and a free-running sparker, that you energize with your
rocker switch.

Yeah, you can put another coil and spark plug in the exhaust, but that
will do squat. The exhaust is hot enough to ignite combustible
material without a spark helper - the spark would really have little
effect at all. What you need is unburned fuel in the exhaust.

Probably (I'm guessing here) the flame-thrower show mods are a fuel
sender to a combustion chamber attached to the exhaust. Separate fuel
lines, separate coil, separate fuel injection system. Hunnert bucks,
yeah, that oughtta do it!

A

#### Alan B

Jan 1, 1970
0
I nearly choked on my lunch seeing the photos of that miserable Honda
Civic. Not satisfied with merely installing fart cans, these "gearheads"
are now LIGHTING the farts.

The first time someone singes my grille, I'm ramming.

Ramming is soooo immature. Sue the bastards.

R

#### Rich Grise

Jan 1, 1970
0
Yeah, you can put another coil and spark plug in the exhaust, but that
will do squat. The exhaust is hot enough to ignite combustible
material without a spark helper - the spark would really have little
effect at all. What you need is unburned fuel in the exhaust.

Probably (I'm guessing here) the flame-thrower show mods are a fuel
sender to a combustion chamber attached to the exhaust. Separate fuel
lines, separate coil, separate fuel injection system. Hunnert bucks,
yeah, that oughtta do it!

I've seen these - right next door, there's a "performance shop", and
I occasionally see this very thing on some show car or another.

I think "a hunnert bucks" will get you about 1/8 of the system or so. ;-)

Thanks,
Rich

Replies
4
Views
338
Replies
1
Views
813
Replies
4
Views
4K
Replies
23
Views
1K
Replies
10
Views
865