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You're right, of course, 8-rotor 13A engine would be about 9.2, 13B about 10.5 litres.
I was harking back to NSU's original capacity rating, which was combustion space swept volume, i.e. 497.5 x 2 rotors, 995 cc for the Ro80 engine. Capacity is now generally based on combustion space swept volume x number of firing strokes per crankshaft revolution (=4), so is double the original rating.
8 rotor conversion is no longer listed, but was based on 13B engine.
Power output (SAE) for standard N/A (2 rotor) 13B engine is around 170 bhp, probably higher without all the anti pollution gismos, and better breathing with carbs.
This would give around 680 bhp, for 8-rotor, but I think he claimed 800. I said "around 600" because I can't find the old brochure.
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