Boils down to engineering EVERYTHING correctly for a turbo on such a
small displacement engine...
Power on any ICE equates to PSI on the piston.
Larger displacement will have a larger dia piston, therefore does NOT
need the PSI needed to make similar/same power from a small displacement
ICE
So, the amounts of stress and HEAT on that tiny displacement will need
much higher design margins than on the bigger displacement
Since smaller (and most cases half) displacement, it also has less
surface area to reject the larger amounts of heat generated per square inch
Why the EcoBoost, from my reading, has an engine oil squirt to the
bottom of the pistons to aid in rejecting heat from the pistons
The block/crank/rods/etc all have to be bigger both to handle the larger
PSI and thermal loading (wick it away quick enough).
Am assuming the head is aluminum, so it has to have much thicker sections
for the higher PSI's and heat rejection properties
Those are just the basic's off the top of my head...there should be
many, many more attributes designed that is invisible to us outside
of the design team
For me, the jury is still out on this and waiting for info to start
flowing on the rebuild of these engines. Key will be whether the block
and head can be just as easily...or will they find micro cracks...
OF course all my comments are for a gasser...and would love to stuff
in forced fed system for my big block, but that is still in the noodling
stages...OEMs won't because of the horrible MPG it will get while in
boost
