What Are RC Exhaust Afterfires and Backfires, and How To Deal With Them.

Written by Julian Wong, Singapore

RC Exhaust Afterfire | RC Exhaust Backfire

RC Exhaust Afterfire | RC Exhaust Backfire (Real Life-size Subaru WRX Afterfire Shown)

What Are RC Exhaust Backfires / Afterfires?

Anyone ever witnessed an RC Exhaust Afterfire? Some mistake this condition to be called a “Backfire”. They are highly common in drag race mobiles, which have oversized engines that aren’t properly mastered by their exhaust – or cost-saving, sub-standard fuel injection systems.

Why Do They Happen?

Truth be told, “Afterfire” is the condition when the fresh fuel ignites anywhere after the engine – in the manifold, the exhaust coupling, or in the exhaust. Whereas, “Backfires” are when the ignition happens on the way to the engine, possibly in the carburetor, back toward the fuel tank. For an RC car model, you could well wind up with your RC Car’s fuel blowing up in your face.

The result of an afterfire  is a flash of bright flame out of the exhaust opening that WILL burn with high heat.

Exhaust Flame Thrower

Exhaust Flame Thrower

Dangers of Afterfires

Even if permanent facial disfigurement wasn’t the case, many RC Hobbyists and Car fanatics try to make this happen to their exhausts, however those using stock exhausts, usually made of nylon, should take care, as internal melting could occur.

Nitro RC Car Starter Box

Nitro RC Car Starter Box

Afterfires in RC Cars & Special Precautions

When you are starting your new RC car with a rich fuel setting, you may experience these afterfires. Take special care to ensure that there are no leaks from your exhaust coupling that may leak out to your hands so that you would not suffer any accidental burns if you are using a hand-held starter. If you are using a starter box, take care to ensure that no fuel gets on to it, as exploding batteries are very dangerous business. Clean any glow fuel spillages before re-connecting your glow-starter and re-commencing your nitro car break in.

About the author: Julian Wong, aged 26, married and self-employed actively trades stocks and forex, and runs several internet marketing programs. His favorite outdoor past-time is off-road RC cars, and he is a proud owner of a Kyosho Inferno and a HPI Savage X 4.6. He keeps an RC blog at https://hpisavagex46.wordpress.com


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