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1 hour ago, ras62 said:

The offset also lowers the forces on the crank/rods so maybe Porsche were more interested in this rather than chase a small performance gain on the 964. On the 3.2 as you say that wasn't possible due to the crown shape. What material are the Carillo pistons and how is the clearance to the barrel?

Agreed, by why do that on one Bank and then any advantage gained is grossly lost by it working against itself on the other bank? My only thoughts are that mahle have produced these for other manufacturers and for instance a 4 pot or straight 6 doesn't use an apposing bank. 

 

Cold clearances are not great on CPS to due to the material used in their construction but appear marginally better than JEs ( I'll need to actually measure this but am away at the min) 

The construction looks better than JEs but the piston skirt appears less substantial so it'll be interesting to see how they perform in the real world. 

The build spec sheet is pretty comprehensive with the Cp pistons. Covers a lot but the ring gaps they specify are pretty significant and have to be filed  each cylinder. As I mentioned too, the oil control rings are a 3 piece arrangement which I don't think is going to fare well in our engines . I'm busy sourcing a 2 piece alternative.

 

DBS

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