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Old 19-09-2007, 11:48   #16
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No one has mentioned Cetane Value yet.

Just like gasoline has a octane diesel has a cetane value, the higher the cetane value the lower the temp an engine can start, less diesel combustion knock occurs, less engine deposits occur less smoke fumes and odor.

The cetane number an indication of the types of hydrocarbon in the fuel more parafinnic, less napthalenes, and aromatics.

Depending on the crude blend and the refinery, virgin stocks (ie not catalytically cracked to smaller molecules) will produce the highest cetane number, but will also have the highest pour point (temperature at which the diesel gels).

All diesel at the pump will meet the high speed diesel engine specifications, there are many other grades of diesels (not at pumps) sold for large engines.

So for marine use don't buy winter diesel (if possible), if you purchase some poor quality diesel in the third world, do not operate your engine at full power, warm it up well, install new filters, cool it down well, consider adding a cetane improver.

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Old 05-10-2007, 04:23   #17
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The Chevron (Texaco) Diesel Fuels Technical Review offers a lot of good information about diesel fuels:

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Old 05-10-2007, 04:39   #18
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Back when I lived on a large acreage on Vancouver Island I had some off road equipment which allowed me to purchase and burn dyed diesel (no road tax). The delivery truck came to my place, filled up my 500 Gal tank with standard greenish yellow diesel (taxed type) and gave me a package of dye to put into the tank. Did I mention I also had a couple of diesel trucks. I told I would do that right away. Yep. Sure.

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diesel, fuel

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