The Stovebolt Site Forums The Shop Area Engine Shop fuel economy scam or real

I bought one of those things in my youth. It was a "water Injector" that bolted under the carb and was supposed to give all kinds of mileage increase and power to my '34 Furd roadster.
All it ever did was take my money and burn out most of my exhaust valves in the flathead V8

Another scam was spark plugs that would "fire in oil", usually a glass jar full of oil. What most people didn't know was that any spark plug will fire under oil and since this was part of a traveling carnival who knows how it was hooked up?