Muffling is doomed
Page 17
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REACHING the proposed heavy lorry noise limit of 80 MA by 1990 is likely to require engine encapsulation.
This was one of the points raised by speakers from both Leyland and Cummins at the Institute of Purchasing and Supply symposium on "The world truck".
John Tucker, chief engineer — power units, at Leyland, suggested that in his opinion the TRRL Foden Rolls-Royce Quiet Heavy Vehicle (QHV) is "not a viable long-term solution to vehicle noise."
He suggested that the development of encapsulation will be necessary when trying to reach the figure of 80dBA.
This view was echoed by Stan Hartshorne, product planning manager at Cummins, who said that encapsulation will probably be necessary for "84dBA or less."
Neither speaker was happy with such a solution because of the significant access problems for maintenance.
Encapsulation of the engine was not a solution which found favour with Geoff Brook at Eaton.
He commented that encapsulation was "the voice of despair" as a long term solution.