2010 Audi R8 V-10

What's the difference in the V-10 engines that power the top Audi and Lamborghini's crown prince? As it turns out, not much. Both share the same basic components and architecture: a 90-degree V-angle, DOHC 4-valves per cylinder top end, mostly aluminum construction. The forged-steel crankshaft and connecting rods and forged aluminum pistons providing a 12.5:1 compression ratio are also shared by both sports cars.

According to Volkswagen AG's powertrain head Wolfgang Hatz and Audi's V-8 and V-10 chief Jurgen Jablonski, the differences are subtle and restricted to intake and exhaust details. Engine mapping-combinations of ignition timing, fuel delivery, valve timing, and operation of the muffler bypass valves-differs to give the Lamborghini engine a more urgent and aggressive personality versus the Audi's slightly steadier, more sedate characteristics. Minor differences in the shape of the intake ports and the configuration of the twin intake plenums topping each engine are also present. While exhaust headers are basically the same, the layout of the mufflers differs significantly according to the space available under each car and the auditory flavor desired by each brand.

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2010 Audi R8 V-10

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