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post #7 of (permalink) Old 18th June 2014
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Re: How necessary is a Bumper undertray?

Undertrays reduce the risk of debris being thrown up into the engine bay. If small stones or such get caught in the auxilairy belt area it can ultimately lead to timing belt failure resulting in serious engine damage. They also help reduce water ingress and with so many electriocs on modern engines they need all the protection they can get.

Such trays can also help reduce engine noise. Noise from the engine is absorbed by the plastic where as if the tray is not present the sound is relected back up from the hard road surface.

A neighbour of mine removed the undertray from his small Puegot van when changing the oil and never bothered replacing it. A few weeks later the timing belt failed - small sticky tarry stones had become lodged on the auxiliary belt resulting in timing belt failure.

You may get away with running without one but why take the risk
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