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Car Forum / Honda Cars / December 2005'94 Accord Intake Air Resonance
Does anyone know of a way to mute (muffle?) the loud intake air resonance of a '94 Accord LX Wagon? I've used a microphone and determined the noise I'm hearing is intake air resonance. The noise enters the cabin largely through the windshield, but also through the doors and upper portion of the firewall. I've insulated the hood and doors, but I'm looking for even more attenuation. I theorize I could design something with PVC with a movable plunger that could introduce an echo. If positioned correctly, it should cancel out much of the noise. It would be a "T" with the plunger directly opposite the intake with the path to the air cleaner off at a right angle. A muffler attached to the intake side might work since the frequencies are exactly the same on intake and exhaust. The cooler denser intake air should mean there would be even less obstruction than if it was used on the exhaust. Even so, I'm willing to put up with a minor decrease in power to decrease noise. Thanks in advance for your help! > Does anyone know of a way to mute (muffle?) the loud intake air > resonance of a '94 Accord LX Wagon? does it have the original intake? i know my 98 civic has a big airbox near the fender with baffles and different air tubes, and im sure its all well designed for anti-resonance. dunno if something like that would fit an older accord. Yes, original intake. Later model Accords got a fancier intake with some sort of gate. > Yes, original intake. Later model Accords got a fancier intake with > some sort of gate. later meaning model change? or revision? anything up to and including 1997 stuff should work, if they changed the design since 94. i think. almost any change will detune it? Mark Yea, that's the problem. I tried plugging up the two goofy PVC expansion containers hanging off the rubber intake tube. It quieted things down a bit, but noticably reduced low-end power. Shouldn't introducing a cancelling wave via echo produce better performance? You'd think the intake would do better with constant air pressure than the peaks and valleys causing the resonance. Unless, of course, it is desinged to time those peaks so pressure is high when the intake valves open. Some time after '94 Honda added a gate to the intake designed to kick in at a certain RPM. My Chilton manual shows it. I've considered swapping mine out with a '97 model, but a friend's '96 Accord LX is still pretty bad under acceleration. An '06 I test drove was nice and quiet with decent power. Too bad handling doesn't feel as crisp and quick as my '94. I don't really understand what you are saying... the resonance can only align the peaks and valleys etc at one particular RPM... if you detune the box so it is quiet , it might effect perfromance at that one particular RPM only??? No?? Mark Good points, but if this method only provides attenuation of one frequency, how does a muffler work? I'm hoping the "echo" will be a sort of shock absorber for the intake side, which hopefully will reduce the noise. |
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