Introduction Audi’s AQH, AVP, AYS and BCS were 4.2-litre, 40 valve V8 engines that powered the Audi D2 S8 from 1999 to 2003. Effectively replacing the 4.2-litre 32 valve AHC/AKH engines, key features of the 40 valve AQH/AVP/AYS/BCS engines included: A cast aluminium alloy block with 90-degree ‘V’ angle; Die-forged steel crankshaft with five main […]
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