Quote:
Originally Posted by cRiPpLe_rOoStEr
That's a good excuse for experiences with gaseous fuels such as propane and CNG, as they tend to decrease the intake temperature, thus NOx levels are also likely to go down.
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I don't know about propane, but in my experience with CNG, the NOx is very high. We used to have quite a few CNG vehicles at work from factory build Dodges to retrofit Fords. One thing they all shared come smog check was NOx right at the ragged edge of failure.
Travis..