The redeeming factors as well. The system created was

The Pros & Cons of New
Emissions Technology

               The
technology applied to diesel engines is constantly changing and adapting to
become a more ergonomic model of what came before. The changes can come because
of problems encountered in previous models that was rethought of on how to do
it to avoid said problem, or to help an engine conform to a standard applied by
a state or country such as emissions. Emissions are the production and
discharge of gasses and radiation. This however can be a work in progress as
engineers test out their solutions and as I’m coming to discover, this is true
with the emission systems applied in newer engines. Although it has its follies
it does have its redeeming factors as well.

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               The
system created was called the selective catalytic reduction (SCR) system. It
works by injecting a liquid-reductant agent called diesel exhaust fluid (DEF)
through a special catalyst into the exhaust stream of a diesel engine to reduce
oxides of nitrogen (NOx) emissions. The pros that I have read upon are that it
is one of the most cost-effective and fuel-efficient technologies available to
help reduce diesel engine emissions. Its effectiveness allows diesel engines to
be tuned and optimized toward maximum fuel efficiency, while the SCR system is
highly efficient at treating the engine-out exhaust.

               This
is great for the environment, but not so great for engine life. The 70’s and
the 80’s left a bad taste in many mouths with no rules or regulations and
emissions devices would rob power, made vehicles difficult and costly to
repair, and ultimately led to the increased prices of vehicles. Back then
however was that they got great fuel mileage and were in service a very long
time. With today’s standards and regulations engines have been reeled back in
and the engines and some who owned trucks with newer systems claim that the
lifespan is affected by this process.

               Although
the SCR system is a good step in the right direction there is always going to
be improvements and adaptations to the diesel engine to achieve the most
ergonomic tractor available. Its our job as the mechanic to understand these
devices and help make them function.