CONTENTSResults of Environmental Conservation Activities in Fiscal 2004Product Development DomainAutomobilesNoise Reduction

Honda also focuses on the development of technology to reduce exterior noise. The air intake, exhaust, and engine are the major sources of exterior noise.
The new Legend, which was put on sale in October 2004, achieved the similar level of exterior noise (to 74 db, which is lower than the regulation standard of 76 db) compared with that of the previous model by reducing exterior noise caused by the engine and intake/exhaust due to the adoption of the following technologies while the output of its engine was increased.

Technology to reduce engine noise

Highly rigid cylinder block
Highly rigid crankshaft
Acoustic material in the engine room
Engine design cover (noise insulating structure)
Engine under-cover (noise absorbing type)

Technology to reduce intake noise

High-volume air cleaner
Air cleaner using noise absorbing material
High-volume resonator chamber

Technology to reduce exhaust noise

Flow adjustable twin silencer