My dad and uncle told me about making a flame thrower exhaust for one of their cars in their youth. My uncle helped me build one for an old truck dad had. It's been almost 50 years, but you build it out of junk parks. It works really well on something that has a manual choke. You first drill holes into the exhaust pipe at the back of the car. You then install a couple of spark plugs into the holes. You will need a small electric motor to drive a distributor to ignite the plugs. I built a small box to house a points distributor, coil and I think we used a windshield wiper motor. This contraption is powered by a 12V source form the battery, which is turned on and off by a switch accessible to the driver.
When the system is installed, you rev up the truck engine, pull the choke out, and turn on the electric motor. The spark plugs ignite the raw gas coming out the exhaust and it will shoot flames out the rear.
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