![]() When that happens frequently a carbon track forms, which is like a shortcut for the spark. Over the course of time, the environmental elements can cause the spark to cross over from one spark plug wire to another in close proximity. In a design that incorporates a distributor cap, all the spark plug wires are attached to the top of the distributor cap. There are a couple different scenarios where carbon tracking can come into play. If your vehicle is equipped with a distributor cap, have it replaced when a tune-up is performed as part of your regular preventative maintenance. When the incorrect cylinder fires out of time when the exhaust valve is open, you will experience a backfire. If a distributor cap is cracked, moisture can get in and cause the spark from one cylinder to track to another, incorrect cylinder. ![]() ![]() This electrical pulse is what causes the spark plug to spark and ignite the fuel in its cylinder. In vehicles that don’t have ignition coils on the spark plugs, a distributor cap and wire set are used to disperse the electrical pulse to the spark plugs. This causes the ignition cycle to begin late in the combustion chamber and ignite the fuel as the exhaust valve is opening. What that means is the engine cycle of fuel-compression-ignition-exhaust in the top end (cylinder head) isn’t in sync with the bottom end(cylinder block). Specifically, delayed timing causes a backfire. When the exhaust valve opens on that cylinder, the extra air allows the unburned fuel to explosively burn and the popping noise of a backfire is heard. When that happens, the fuel burns slower, and isn’t complete before the exhaust part of the engine cycle. When an engine runs too rich, there is too much fuel to create an explosive, fast-burning flame. It can be caused by a multitude of issues including some as straightforward as a dirty air filter. If your engine is being supplied more fuel than it needs to burn efficiently, it’s called a rich fuel to air mixture. Here are some causes of that delayed detonation that may clear it up a bit more. What Makes a Car Backfire?īackfiring is the process of a spark plug, or multiple spark plugs, igniting the fuel in their cylinder out of turn, in a part of the combustion process where the exhaust valve is open on that cylinder. ![]() ![]() And that final detonation at the end is actually fairly common in this situation. The jerky driving spells out that it’s out of tune. The smoky exhaust indicates an inefficiently performing engine. It’s an exaggeration of how a backfire actually occurs, but it’s not totally inaccurate. It is not only much quieter but also does not allow the fresh air to enter the exhaust due to reversion. The reason you do not hear this on a bike with a stock exhaust is due to the baffling of the stock exhaust. Popping on deceleration is due to unburnt fuel being ignited in the exhaust. Archive O-360 C/S Exhaust popping Traditional Aircraft Engines. ![]()
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