Engine valve cover mounted with BMC is reduced by 0.7 dB comparing with that mounted with cast aluminum.

• 配装压铸BMC复合材料和铸铝材料气门室罩的2115型柴油机整机噪声试验也表明:用压铸BMC气门室罩能降低整机A计权声压级噪声0.；7 dB。