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  #1  
Old 11-12-2010, 02:33 PM
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,874
What Affects Soot Production?

Other than driving habits, what affects soot level in a given engine? Specifically, what, if anything, can go wrong/deteriorate in an engine to cause soot levels to rise signifcantly?

In my 602 with mixed driving at 7500 miles, my soot level was 0.8%....mileage was about 180,000 at the time. Needless to say, I was pretty pleased.

So I'm wondering, could this get worse? Or is soot production likely to be the same for the next 200,000 miles?

Thanks.

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06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
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  #2  
Old 11-12-2010, 03:52 PM
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Join Date: Jul 2004
Location: Barrington, RI
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Found this as at least a partial answer:

Worn-out rings or injectors, ....poor fuel spray patterns and incorrect air-fuel ratios are major causes of soot formation. A faulty fuel nozzle may spray more fuel than desired, increasing the fuel-to-air ratio and causing incomplete combustion and soot accumulation, or the air filter may become clogged, decreasing air supply and increasing the fuel-air ratio.

And I guess raises another question: if soot production were becoming significantly worse due to one of these factors, would there be noticeable symptoms other than the soot itself?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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  #3  
Old 11-12-2010, 04:04 PM
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Join Date: Nov 2009
Location: Austin, TX
Posts: 1,230
Worn Rings = more blowby, crankcase oil in combustion chamber, blue/white smoke from exhaust

Worn injectors = loss of power, lower mpg, rough idle

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