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The S65 is 80% the displacement of the S85. It is also 84% the weight and makes 82% of the power (85% if you look at the wheels.)
The S65 is going to be bound in part by being based on the S85.
The S65 internals are forged and the rods are steel-magnesium. Pistons are Iron coated and the crank is forged steel. The internals are stronger than the Mercedes 63 series. It is a better built, more technologically advanced motor that pushes the envelope further.
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