Prius Pistons

[xnamerxx]

I wouldn't take the crank having a different part number as meaning anything more then it might not have a standard bolt pattern or it might require a longer snout.

Here is a cutout of a 1nz-fxe from an autoshow.

You can see the giant mechanical flywheel, which doesn't have provisions for a starter and you can see the giant start/stop starter on the front of the engine.

I seriously doubt that the FXE piston would have any issues in the FE engine aside from the massive increase in compression that would cause some tuning issues. The compression being close to 13:1 doesn't really scare me as long as you can control the tune, which is pretty much only possible with a aftermarket ECU. I've seen 4.6l engines running 12.6:1 on 91 octane its doable just takes more work.

The piston being HYPEREUTECTIC doesn't mean it can't handle power it just means the piston is less elastic than a forged piston, meaning when its given a shock like say detonation it doesn't deform as much so if the material sees a strong shock it will crack rather than deform. Hypereutectic pistons have some great properties about them that make them suitable choices for performance oriented situation like the fact they have little heat deformations which means they don't compress and swell as much with heat which means you can run a piston tighter in the bore and you can also run a lighter piston which makes the engine more efficient.