As part of the project 'soundproofing' I've fitted some sound absorbing material under the hood. A modern car has fitted this as a standard, but my Land Rover hasn't. I was hesitating about an engine blanket or absorbing material on the underside of the hood. Finaly I have chosen the last option. As access to the engine bay is necessary on a regular basis for topping up the oil and other routine maintenance and because I dislike something loose on top of the engine I have chosen for the absorbing material on the hood.
The result of the absorbing material is clearly recognizable. Total soundlevels are reduced and especially the shrill sounds are totaly gone. The roaring of the diesel engine stays the same. Next step is fitting anti-drumming material on the bulkhead and the doors etcetera. So, to be continued.
By the way, I discovered that the noise that starts shrilling at around 80 km/h, wasn't coming from the propshaft, as I initially suspected, but from the red lever of the gearing box.
 The material I haven chosen for is Merfocell PU, which is obtainable from www.noisecontrol.nl. It's a thick self adhesive foam matting, finished with an oil and waterproof surface. |
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 First of all I shut a couple of holes in the hood by glueing some aluminium parts over the holes. After that I covered the whole underside of the hood with Merfocell PU. I stuck some left overs in the engine bay side of the wingtops. |
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