If the engine backfires, the sudden pressure in the intake manifold forces the valve back.
Summarized some important experience on designing injection mould of plastic air intake manifold.
The intake system mainly includes the air filter, intake ducting, the carburetor, and the intake manifold. Some engines have supercharger in the in take system.
Recently Atkinson cycle has been used to describe a modified Otto cycle engine in which the intake valve is held open longer than normal to allow a reverse flow of intake air into the intake manifold.
Nick set one end of a long socket extension on the intake manifold and listened to the other end.
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