Posted by sotxbill on February 14, 2011 at 11:47:21 from (144.160.98.31):
In Reply to: Re: diesel cetane posted by Nancy Howell on February 14, 2011 at 08:33:12:
no.. cetane controlls how fast the diesel burns and limits the higher rpms of the diesel engine. If you have high enough cetane to run at 5000 rmps, and your engine will only run at 3800 rpms due to the governor or computer, adding more cetane improver will not help. a special test engine is used to determine the max rpm of the engine under the test diesel. Cetane gas is used at a reference to see if the diesel burns faster or slower. If your fuel has enough cetane to run at 5000 rpms,, it will not help to ad more cetane improver as your engine will not and can not run faster than the computer will let it run. Modern computer controlled diesels actually run the injectors so that they fire LATE in the cycle. Because of the late firing, cetane numbers become a bit more important as you need it to completly burn fast enough. Again, if your fuel is high enough, adding more cetane improver will NOT help.
cetane improvers do NOT make it start better or run better if you already have fuel at the correct level.
So bottom line, in north america is is difficult to buy diesel that is too low in cetane. And due to the uld is plenty good for engines.
However there are lots of opinions and lots of snake oil out there.
If you run a good injector cleaner through the engine every 50,000 miles and keep the filters clean and the glow plugs working with good starting batteries, you will do ok on pump diesel.
filling stations automatically convert to winter diesel early enough to protect you from gelling in ultra cold in most cases. winter diesel does not have the same horsepower as summer diesel, so they will change back to summer diesel as the weather warms up. You should not need additives as some folks run a million miles with no additives and others claim to run 200,000 miles with additives...
As I get any diesel equippment through the shop, I run a can of BG 44k injector cleaner though it. If the injectors are already clean it will do nothing. If they are dirty, you see it start quicker and run better. As I buy it by the case it cost me about $13 a can. Clean injectors will make the diesel fire quicker and complete. Make sure your air filter is cleaned a replaced every couple of years. Oil covered air filters will destroy the maf sensor in modern diesel engines so stay away from them.
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