On 19/01/15 12:24, Tim+ wrote:
Diesel exhaust smell doesn't necessarily correspond with significant CO
levels. Because diesels are un-throttled, they inherently produce much
less CO than petrol engines.


However the smell of a diesel exhaust is ultimately unburnt or partially
burnt hydrocarbons.

And the soot is unburnt carbon.
So combustion is not as complete as one wou7ld perhaps infer from your
statement...

In fact a non turbocharged diesel is throttled entirely on the fuel to
air ratio. At moderate to high throttle settings its is heavily
overloaded with fuel and very rich on unburnt and partially burnt fuel -
and that includes CO.

And indeed if anything happens - like a partially blocked air filter -
to restrict air intake, CO production can be very high indeed.

http://www.nizkor.org/faqs/leuchter/...er-faq-19.html


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