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Yeah, I'm in the expansion rate camp as well. But I've been wondering, what exactly lead Porsche to develop Dilivar? Sometimes the engineers over-think things and the field guys just make it work. So what if you use a high-strength alloy and the cylinders get distorted by a few microns when the engine is hot? There are plenty of other variables that affect engine longevity.
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"Simplicity is supreme excellence" - James Watt
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