Quote:
Originally Posted by mwebb
i do not suppose such an engine actually exists nor will it ever find it's way to production because of durability issues -
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In the early 80's they were working on it and actually built some test engines with at least one being tried in a car. Due to tightening NOx emissions standards all research was abandoned.
Popular Science - Google Books page 64
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Popular Science - Google Books page 77
Quote:
and
in the real world , we do not want to use an engine that has no restriction on NOX production as NOX is very bad for humans , none the less , EGR can be used to limit NOX formation
on
any
engine
real , or imagined
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yes. I agree that we don't wont unlimited NOx.
However use of EGR does two things to control NOx. One it displaces excess Oxygen. Two it cools the combustion charge by requiring the fuel to heat more mass thus keeping combustion temps below that required to form NOx. One key advantage of a ceramic engine is you can have a much hotter combustion and therefore extract more power. EGR would negate this benefit. EGR also reduces the specific heat ratio of the combustion gases, thus limiting efficiency.