Reliability of coaches using DEF
I have wanted to upgrade as my Holiday Ambassador is moving toward it's 10th year. How are people doing with the newer coaches using DEF? It's made me wonder if moving back to a gas coach makes more s...
Forum Discussion
In general, when you can do the clean-up after the combustion process, then you can run the combustion for best efficiency and not lowest emissions. If you remember back in 1975, that was the first use of catalytic converters on gas engine vehicles. Everyone bemoaned having to use unleaded fuel but the 1975 vehicles with converters ran so much better and with such better fuel economy (because the converter cleaned up the exhaust "after" the combustion process)as compared to 73 and 74 that most people soon stopped complaining about having to use unleaded fuel.
Same with DEF, it allows the clean up to be done after the combustion process and with the advent of the digital controlled diesel injection, the engineers have much more control over every point of the combustion cycle. They can tune the combustion event for better efficiency and allow the clean up to happen in the exhaust after treatment devices. Lowest emissions in the combustion cycle and maximum efficiency in each cycle are usually not the same point.
If you have to "tune" the combustion process for lowest emissions with no after treatment, you generally are not at the point where you have max efficiency.
Same with DEF, it allows the clean up to be done after the combustion process and with the advent of the digital controlled diesel injection, the engineers have much more control over every point of the combustion cycle. They can tune the combustion event for better efficiency and allow the clean up to happen in the exhaust after treatment devices. Lowest emissions in the combustion cycle and maximum efficiency in each cycle are usually not the same point.
If you have to "tune" the combustion process for lowest emissions with no after treatment, you generally are not at the point where you have max efficiency.
