Re: Diesel exhaust.

Posted by jimg.allentown on July 27, 2016 at 15:56:30 from (173.49.143.137):

In Reply to: Diesel exhaust. posted by Geo-TH,In on July 27, 2016 at 11:26:33:

If I may add something here....
Older diesels had a kind of "kerosene" smell to them when idling. More of a "furnace" smell to them under load. At least that is what they smelled like to me.
Somewhere along the line, they added some type of exhaust device to them that I am told was some form of a catalytic converter. These were the ones that had to periodically regenerate. Their exhaust had a really sour smell to them. Those would give anybody a headache in no time flat.
However, the newer ones - tier IV I suspect - seem to have no smell to them at all.

Back in the 1980s, when we were emission testing cars (gasoline powered) with a probe in the tailpipe, emissions were quite low. Something like 200ppm or less on the HCs and around 10ppm or less on the CO. Even then, diesels were considered cleaner than gas because they emitted much less HC and CO. Their downfall was particulates and NOx emissions. This was due to the lean running nature of diesels along with higher combustion temperatures. Now, diesels are coming with particulate filters, catalysts, and EGR. By now, there should be nothing coming out of the exhaust but fresh air.

If you want to know what REALLY stinks, get behind an older car prior to 1975. Those fumes will bring tears to your eyes.

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