by Audi in their Le Mans winning R8 racing car. The 5.2 V10 FSI was developed directly from this V8 engine. identification parts code prefix/variant: 079.D displacement & configuration 90° V8 engine; cylinder bank offset; cylinder spacing; bore and stroke: , stroke ratio: 0.91:1 – undersquare/long-stroke, 520.4 cc per cylinder, compression ratio: 12.5:1, firing order: 1–5–4–8–6–3–7–2; water:oil lubricant cooler (RS 4/R8 utilises an additional thermostatically controlled air:oil cooler); Q7 and RS 4 utilise a wet sump system (RS 4 with additional longitudinal axis flapped baffles controlled by lateral g-force), R8 uses dry sump cylinder block & crankcase homogeneous monoblock low-pressure chill gravity die casting hypereutectic 'Alusil' aluminium-silicon alloy (AlSi17Cu4Mg) with a closed-deck design, mechanically stripped hard silicon crystal integral liners, honed under simulated mechanical stress; reinforced by a cast lower crankcase alloy bedplate (AlSi17Cu4Mg) mimicking a ladder-frame design, and including five GGG50 nodular cast iron press-fit main bearing caps each attached by four bolts; overall length, cylinder block height; two-stage 3/8" simplex roller chain and gear driven 'accessory drive' which includes the oil pump, water pump, power steering pump, and air conditioning compressor; baffle-plate sump crankshaft, connecting rods and pistons die-forged and tempered high alloy steel (42CrMoS4) 90° crankshaft with diameter and width main bearing journals and diameter and width big end bearing journals; long high strength forged cracked trapezoidal connecting rods (36MnVS4 in basic engine, ultra high strength 34CrNiMo8 in RS 4/R8 with more restrictive geometry tolerances); forged aluminium pistons with shaped piston crowns designed to impart charged volume tumbling effect for fully homogeneous air/fuel charge cylinder heads & valvetrain cast aluminium alloy, partition-plate horizontally divided intake ports producing a tumble effect (larger cross-section on RS 4/R8); four valves per cylinder: chrome-plated solid-stem (hollow-stem on RS 4/R8) intake valves, and chrome-plated sodium-filled hollow-stem exhaust valves, both with valve lift (longer valve lift on RS 4/R8), 32 valves total; lightweight low-friction roller finger cam followers (uprated with peened rollers on RS 4/R8) with automatic hydraulic valve clearance compensation, double overhead camshafts (each a hollow tube composite) on each cylinder bank, driven from the flywheel side via a two-stage chain drive using three 3/8" simplex roller chains (sleeve-type on RS 4/R8), valve opening (in crank angle degrees) 200 intake (230 for RS 4/R8) and 210 e exhaust (230 for RS 4/R8); valve overlap facilitates integral exhaust gas recirculation; continuous hydraulic vane-adjustable variable valve timing for intake and exhaust camshafts with up