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Hey Everybody! It's me again. I was just wanted to ask what the benefits of a Commonrail 5.9 is over a regular 5.9? Is mpg better? More power? I have a commonrail in my Ford Excursion and just wondered what the benefit/drawbacks were of each engine.
 

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There are a lot of threads on this subject on other forums and the pros and cons are still tough to balance in favor of one or the other. I would love to see your wiring harness details. I'm working on a 2005 5.9 into a 2006 F250 and want to build my own harness adapter.. I went with the common rail to get more horsepower and a quieter power plant at the expense of simplicity and more cost and arguably less reliability and durability... I have never owned a commonrail before but loved the 12 valve 5.9 in my old first gen.
 

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Like Elbonk said, there has been lots of discussion about the pros and cons. As for power level, a mechanical 6bt can reach extreme power but since the common rail is computer controlled it can be turned up a lot cheaper. One of the main reasons we went away from the mechanical injection system was smog control. Probably not a huge difference in fuel mileage, but the computer metered system probably has an edge.
 
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