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Originally Posted by oil pan 4
I took my old diesel and made it run cleaner.
Not sure if it makes more or less NOx with water injection
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It should make less as the water vapor keeps peak temps down a bit and spreads the heat more evenly.
The steam also helps to reduce or clean out carbon deposits in the engine, which is also good.
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Now I get nearly no smoke.
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No smoke on a diesel means better combustion.
If you don't use that for increased performance, you should also see an improvement in FE.