Volvo designed and built 'RS' engine.
There are some differences between this engine and the earlier RNCT T5's.
The main one being that to attend to the weakness in the earlier blocks, the liners are plasma coated with aluminium which forms a strong bond with them. When the molten alluminium is poured it melt with that ally. coating. The resulting bonds between iron liner, plasma coated ally. and alluminium block give all the strength needed to support much higher temperatures and pressures. Interesting to know if this block is solely for the RS and C30R or will it be in MY '10 T5/STs.
Apparently Nissan are using this same process with their new Skyline engines which allows the iron liner to be under 1mm thick.
I believe the old R pistons and rods are in the 'RS' engine together with at least one of that engine's cams.
The RS runs a larger KKK turbo of similar design to those on the smaller Volvo T5s together with larger intercooler, rad., and inlet tract with similar 'cone in box' filtering as the old Rs, some attention was apparently given to get some more cooling air arround the RS engine. Stronger engine mounts also feature. The downpipe being the same but with one cat block removed. And the very same Quaife diff that is available in the aftermarket for the M66 box, but machined internally to accept the fatter splines of stronger driveshafts.
The RS engine is controlled by the same ME9 computer as the small Volvo T5s and the Focus ST but Ford continue to write their own unique software.
Regards, Don.