lower revolve rating? cos it changes gear quite fast. oh,
comparing to OC
Different methods of exhaust treatment used.
OCs use SCR or Selective Catalytic Reduction, which uses urea
resin (AdBlue) to convert harmful NOx compunds into water vapour
and harmless nitrogen gas. Probably the main disadvantage of using
such a method is the introduction of an extra tank that adds on to
the weight of the bus. However it is proven that SCRs allow lesser
fuel consumption rates.
The Euro EEV KUBs use EGR or Exhaust Gas Recirculation. This
technique cools a portion of the exhaust gas before allowing it to
be introduced into the engine which therefore leads to a lower
combustion temperature. Advantages of this are that there is no
added inconvenience to the driver because he doesn't need to top-up
AdBlue. Adding on to that there is no extra weight added to the
vehicle due to the extra tank having to be installed. However by
lowering the combustion temperature you affect the performance of
the engine, and also it has also been proven that EGRs increase
fuel consumption due to increased concentration of recycled gases
in the engine.
Having said that is it much better to spend on AdBlue than spend
more on diesel? Plus consuming more diesel relates to causing more
environmental damage.
Perhaps someone can vet my reply to see if I missed out any
points or highlighted any of them wrongly.
