Originally Posted by Cay_PI

991.2 still has no liners. They introduced a iron surface brought in the cylinders by rotating single wire method with the 9A2 engines (3.0 Turbo). The 9R1.5 enignes (991.2 GT3) use the same technology. So the surface is iron but no liners. In case of failure, liners can be put in like in the pure alusil motors. It has some advantages (softer metarial for the block vs. pure alusil so cheaper tooling, better friction) and some disadvantages (coating can fail, some cases with rust). The newer alusil motors are very reliable.

This all has nothing todo with nikasil. The motor is still alusil. And the new coating is not GT3 specific.

Originally Posted by Maverick11

Neither. Plasma coating is used in the current GT3 and 3.0 turbo motors. Supposedly bullet proof stuff. Tech has been around but just recently started being used on engine blocks. Nissan GTR was I think the first car to use it. Apparently that engine was disassembled after a 250k mile wear test and you could still see the machining marks on the wall. Time will tell but new AMG engines, Ford and a handful of others including Porsche are now using it.

Originally Posted by Maverick11

Neither. Plasma coating is used in the current GT3 and 3.0 turbo motors. Supposedly bullet proof stuff. Tech has been around but just recently started being used on engine blocks. Nissan GTR was I think the first car to use it. Apparently that engine was disassembled after a 250k mile wear test and you could still see the machining marks on the wall. Time will tell but new AMG engines, Ford and a handful of others including Porsche are now using it.