Quote:
Originally Posted by ConnClark
Warm air intakes increase combustion temperatures. This has significant implications for emissions as it creates more NOx. The increase in combustion temps also increases coolant loses. That combined with emissions computer changes to compensate for will swamp any gains from reduction in pumping losses.
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If ambient air temp is 30 deg C and it gets warmed to 60 deg C, an increase of 30 deg, if that increases combustion temp by 30 deg then that is not going to do a lot as regards NOx. If it increases combustion temp by
more than 30 deg then you have gained something thermodynamically. (excluding the energy consumed in additional NOx production) Thermal losses to the coolant would have to be extremely nonlinear for this increase to produce an overall loss. If that were so, cooling peak flame temp marginally instead of increasing it would produce worthwhile increases in overall thermal efficiency.