Why do diesels (generic)....? - Ford C-Max Forum
 
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post #1 of 2 Old 03-14-2011, 01:03 AM Thread Starter
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I have noticed on a few diesels that when ticking over when stationary or very low revs with minimal 'load' on the engine that they sound like they 'clonk'. I know no other way to describe this, but I have heard it on Fords and VWs, so I do not think it is anything wrong with them.

Is it just because diesels are noisier than petrol cars? I am not looking for a very technical answer, just a basic one because I am curious.


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post #2 of 2 Old 03-14-2011, 02:07 AM
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Diesels are louder because they don't have the same intricate control over ignition timing as petrols. They always sound lumpy at idle and get smoother as speed builds. The compression ratio is a lot higher too so the blocks and heads are all heavier which seems to make them more bassy and thud more.

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