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Originally Posted by MNBoxster
Hi,
Only partly true. The newer models do not have a different block. Porsche, to save money on Production Costs, adopted a Casting technique invented by Audi which eliminated the need for post cast maching, there is no traditional center-bore machining at all. This results in a % of Blocks where the opening for the Crank is not properly centered. This is one cause of RMS - the Seal can never be properly seated to begin with.
The other involves the way the Crank is cradled. This design allows the Crank to meander slightly off it's centerline, and this is what abrades the Seal leading to premature failure.
All variants of the M96 engine suffer this and to a high extent. At least 25% from anecdotal sources and if you believe Scott Slausen at PCA Tech Committe, he states that all M96 engines will have this problem. ..
Happy Motoring!... Jim'99
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Thanks for making more sense out of what I was trying to say. So is it true that the newer models have fixed this problem? I heard that it is no longer an issue with the 987 models.
