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I had a volvo 740 estate and the bit that went over the rear axle only lasted a couple of months must have been a bad part.Do they last longer as they get coated in soot which stops moisture build up etc.
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Not forgetting of course diesels aren't called oil burners for nothing.
That extra soot and oil kicked out through the exhaust will help to preserve it longer than a petrol engine will.
The modern petrol car with a cat helps to convert carbon monoxide into carbon dioxide and water, and thus the exhaust doesn't last as long as pre cat cars due to the extra water rotting them out.
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Previously mentioned Vaux Cavalier 169k up 10 yrs old had the original exhaust (minus a recent tail pipe.)
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"The modern petrol car with a cat helps to convert carbon monoxide into carbon dioxide and water"
Er, no... CO is 'burnt' with more oxygen to turn it into CO2 - no water involved.... I think that unburnt hydrocarbons might also be oxidised by the cat, and this might roduce additional water, although I doubt it is significant alongside the amount produced by a non-cat engine!
For reasons I don't really understand, diesels steam much less than petrols after a cold start (possibly to do with them running so lean, and not needing a choke to make them run when they are cold?) - I reckon it's this that makes them last longer. That and the healthy covering of soot on the inside!
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RichardW
Is it illogical? It must be Citroen....
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I think that a lot will be due to the lower exhaust temperatures of diesels vs petrol placing far less stress on the exhaust system.
madf
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I think that a lot will be due to the lower exhaust temperatures of diesels vs petrol placing far less stress on the exhaust system.
In general it's the parts that operate at lower temperatures that corrode the quickest. In practice there is a critical temperature at which corrosion is the worst. In most petrol cars this occurs a few inches forward of the end of the tailpipe. However, I once had a car in which the critical temperature occurred just at the end of the tailpipe. The end of the pipe became quite ragged.
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L\'escargot.
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"The modern petrol car with a cat helps to convert carbon monoxide into carbon dioxide and water" Er, no... CO is 'burnt' with more oxygen to turn it into CO2 - no water involved....
I was quoting from howstuffworks.
auto.howstuffworks.com/question66.htm
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>>I was quoting from howstuffworks.
I need to tread carefully here!
While that site does represent a lot of work and effort, and, in general, contains good and accurate information, I'm not sure that its content should be taken any more or less seriously than most well considered posts on this forum. I get a little bit concerned that sometimes the site is quoted as if its content were beyond question.
Number_Cruncher
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