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Message: [QUOTE="Isobaric, post: 1254658, member: 18078"] Great post Curtis. One thing to remain cognisant of, when spinning 4000+ rpms (free rev or not), is that you have a rather large chunk of aluminum accelerating rapidly at BDC and TDC. I have not done an FEA on a 7.3L piston to see what the acceleration threshold is, but per Mahle the limitation of a stock 6.6L duramax piston is 5150. Consequently, there is a bowl full of piston pieces and a windowed 6.6L block that was attained at 5151rpm. Hopefully this touches on your question regarding why the Mercedes is mechanically capable of 7k, but a PSD is not. Sent from my XT1060 using Tapatalk [/QUOTE]

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