Quote:
Originally Posted by Piwoslaw
I read about how PSA is improving its 1.6 HDi turbodiesel by increasing the bore and shortening the stroke. This keeps the displacement, but reduces the surface area through which heat can be lost. The larger bore also allows slightly larger valves, which reduces pumping losses. I have no idea how much this helps FE, my guess is barely.
Cooled EGR and an intake restriction to help suck more EGR have been standard for years.
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This is in fact opposite, larger bores and shorter strokes have more surface to volume ratio in the combustion chamber.