Introduction Audi’s BNS was a 4.2-litre V8 petrol engine that was introduced in the Audi B7 RS4 in 2006. Key features of the BNS included: Two-piece, closed-deck cylinder block; 90-degree ‘V’ angle; Die-forged crankshaft made from 42CrMoS4; Split connecting rods made from 34CrNiMo8; Forged aluminium pistons; Chain-driven double overhead camshafts; Four valves per cylinder actuated […]
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