Hoping you guys could answer a few questions for me.
I know the ej207 big port heads, cams, valvetrain, turbo and probably intake manifold etc etc help the jdm ej207 make more power than the us ej205, but I am really only concerned with the bottom end, and more much more concerned with strength than I am power.
I know the jdm ej207 block is semi closed deck while the us ej205 is not, possibly allowing the cylinder itself to move, but what else about the block/bottom end itself makes the ej207 handle more power/tq/more rpms than the us ej205? Completely different crank? stronger rod material/design? Stronger piston material design?
I feel like the stock 145,xxx mile ej205 in my "stage 2" 2005 Wrx is loosing it's pep and could really use a rebuild or replacement and trying to figure out the best way to go about it.
I could probably see myself doing a complete ej207 block/head swap if it is possible to do so on my usdm 05 Wrx ecu or possibly usdm 06/07 Wrx. I might possibly think about an ej25 swap but all the ringland/piston failure stories scare me a little (a lot), plus I like the smoother, faster/higher revving 2.0 more than the 2.5. But forget all the 2.5 talk, I am only interested in the 2.0 blocks and what specifically makes the ej207 stronger than the us ej205?
If different crank, what exactly is different?
If different rods, is it different material or design that makes it stronger?
I would like to stay 2.0 and oem as possible. Thanks guys.