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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
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Originally Posted by juicersr View Post
Just curious, how did the factory make it's magnesium cases last on the '74 2.1 RSR turbo? They ran 1+ bar of boost and 450 hp with a magnesium case in every race except for Lemans where they used an Aluminum case. Did they replace them every race or something?
The problem is not firing pressure because turbo'd or non the same effective compression ratio applies. I suspect the root of the problem with pulling head studs on the Porsche MAG case is the same as VWs mag case. The issue is; one must keep the oil temps and cylinder temps within spec. Exceed the specs and there is little or no safety margin with MAG. AL gives that safety margin plus it holds the mains in line on high RPM applications. RPM is not a consideration here.
Old 01-19-2008, 06:06 PM
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