Loose inlet to air filter - Toyota Yaris Forums

Yaris Hilton · 04-25-2009, 06:15 PM

Won't really hurt anything even if it falls off. It'll just be noisier. That horn is an intake silencer, that resonates with the enclosed volume of the air box to make a Helmholtz resonator the resonant frequency of which doesn't resonate with the intake pulses at the noisier speed ranges of the engine. Same as the air horn sticking out of the round air cleaner on many older carbureted car engines. Pull the air cleaner off of one of those cars sometime, run it briefly and hear how loud it is with the air cleaner off! The air cleaner assembly serves a similar purpose to the exhaust muffler, though the exhaust is louder than the intake noise.

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04-25-2009, 06:15 PM	#3
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Won't really hurt anything even if it falls off. It'll just be noisier. That horn is an intake silencer, that resonates with the enclosed volume of the air box to make a Helmholtz resonator the resonant frequency of which doesn't resonate with the intake pulses at the noisier speed ranges of the engine. Same as the air horn sticking out of the round air cleaner on many older carbureted car engines. Pull the air cleaner off of one of those cars sometime, run it briefly and hear how loud it is with the air cleaner off! The air cleaner assembly serves a similar purpose to the exhaust muffler, though the exhaust is louder than the intake noise.