Quote:
Originally Posted by Daox
I find it very interesting that turbocharging plus lean burn give very little efficiency increase compared to EGR + long stroke.
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You need to keep in mind that it gets much much harder to get that extra 1% as you increase in efficiency.
The real gain is going with the direct injection.
I also wouldn't give the long stroke too much credit. Only when its paired with the direct injection that it gains you something due to the better turbulence. Otherwise the long stroke just increases the surface area for the combustion gases to loose heat/energy to the cooling system. Of course the cooled EGR compensates for that to some degree.