Mercedes-Benz SLR-Class 2007 - Manual (Page 387)

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Technical data
Electrical system
Mercedes-Benz SLR McLaren Mercedes-Benz SLR McLaren 722 Edition
Generator (alternator) 14 V/150 A 14 V/150 A
Starter motor 12 V/1.7 kW 12 V/1.7 kW
Battery
Starter battery 12 V/35 Ah 12 V/35 Ah
Battery for electrical consumers 12 V/70 Ah 12 V/70 Ah
Spark plugs NGK ILFR6A NGK ILFR6A
Electrode gap 0.031 in (0.8 mm) 0.031 in (0.8 mm)
Tightening torque 18 – 22 lb-ft (25 – 30 Nm) 18 – 22 lb-ft (25 – 30 Nm)