There is normally a different compression ratio between NA & boosted engines. Dished pistons and more chamber volume in the head are on the turbo engines. How did Mercedes accomplish this? Or I guess an easier way to ask: What are the differences between NA & turbo?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.