2014 911 GT3 Section 1 9/12/13 7:46 AM Page 12
911 GT3 (991) 1.7 Valve drive The two timing chains on the GT3 are the same as the ones used on the current 911 Carrera models (991). The use of valve lever control for the valves is new,
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hollow-drilled valves (intake and exhaust), allows for high engine rpm.
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High engine speed concept The high engine speed concept for increasing engine output and performance has been further improved for the new 911 GT3. The maximum engine speed of the new 911 GT3 is 9,000 rpm, which is 500 rpm higher than the previous model (997 GT3 II: 8,500 rpm). This is possible thanks to the low moving masses of the crank and valve drive. In addition to the low translational masses (pistons, connecting rods, valves, valve levers), the rotating masses of the drive system have also been reduced on the new 911 GT3. The reduced translational and rotating masses not only ensure a low weight, but above all high engine speed dynamics.
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Engine
combined with lightweight aluminum pistons, forged titanium connecting rods and,
