Is the 3.4 and 3.6 based of the 3.2?

[blue2000s]

Originally Posted by pk2

If the blocks are all the same, why was is it that the lowly little 2.5L 98/99 Boxsters are the only ones that catastrophically crack their little cylinder walls? If anything I’d think they’d have thickest cylinder walls.

Regards. PK

A couple of misconceptions here. The castings for the 2.5 and 2.7 are not the same as the 3.2 and 3.4. So the outer cylinder wall diameter is not the same. Also, cylinder wall cracking is a BIG issue on the 3.4. Cylinder sleeve slipping is the more common issue on the 2.5. It's a different failure mode.