1 results about "Back-fire" patented technology

A back-fire or backfire is combustion or an explosion produced by a running internal combustion engine that occurs in the air intake system rather than inside the combustion chamber. Unburnt fuel that is ignited in the exhaust system can produce loud sounds even if flames are not present at the tailpipe. This is called an afterburn or after-fire since a backfire occurs through the intake system. A visible flame may momentarily shoot out of the exhaust pipe under some conditions. Either condition may cause a loud popping noise and usually indicates an improperly tuned engine.