reginos:
According to C&D it is 88lb lighter. RUF just mention "under 200kg" which could be anything. Smiley

Perhaps they meant 88lb lighter than the Turbo engine  Smiley

 Yes but C&D actually quotes RUF: "Ruf claims that the engine is only 0.8 inch longer than the current flat-six and that it is an amazing 88 pounds lighter". And sure it could mean anything but usually when a car maker says their engine weights "under X kg", where X is a rounded figure, it means that probably it isn't much lighter than that. So if the engine weights 164 kg, then they would have said "under 170 kg", not "under 200" I would presume. So I'm guessing the actual weight is between 190 and 200 kg, which is 40 kilos lighter than...a Gt3 engine maybe ? Because now that I think about it I'm pretty sure they're comparing it with the previous RGT engine, which was a GT3 flat6, and not with the standard carrera engine.