Audi RS4 BMW M3 Mercedes C63
Displacement 4,163cc 3,999cc 6,208cc
Valvetrain 4-valves per cylinder, dohc, intake camshaft adjustment, hydraulic valve adjustment 4-valves per cylinder, dohc, infinite camshaft adjustment, hydraulic valve adjustment 4-valves per cylinder, dohc, camshaft adjustment, hydraulic valve adjustment
Bore 84.5mm 92.0mm 102.2mm
Stroke 92.8mm 75.2mm 94.6mm
Block material Aluminum Aluminum Aluminum
Head material Aluminum Aluminum Aluminum
Fuel injection Direct injection Sequential Sequential
electronic port electronic port
Peak power 420 hp @ 7800 rpm 414 hp @ 8300 rpm 451 hp @ 6800 rpm
Peak torque 317 lb-ft @ 6000 rpm 295 lb-ft @ 3900 rpm 443 lb-ft @ 5000 rpm
Redline 8250 rpm 8400 rpm 7200 rpm
Compression ratio 12.5:1 12:1 11.3:1
Horsepower/liter 100 105 73
By Michael Febbo
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