Autoelectro identifies dual alternator requirement in Rolls-Royce V12 engines

Discovery made during new part number introduction reveals unique engine design

Autoelectro identifies dual alternator requirement in Rolls-Royce V12 engines

Autoelectro has discovered that the Rolls-Royce 6.7 V12 engine, found in the latest Cullinan, Phantom, and Ghost models (2018 onwards), requires two alternators. This finding emerged during a routine new-to-range exercise, where the company identified discrepancies in OE numbers for identical vehicle details.

The investigation involved procuring an OE alternator and conducting reverse-engineering, which revealed the engine’s design utilising two alternators, one on each side. Autoelectro subsequently introduced a new part number, AEG1689, to complement the existing AEG1647.

Research indicated that the engine also features two batteries, one for standard vehicle electrical systems and the other for specialised equipment, likely catering to luxury features. Older Rolls-Royce 6.7 V12 engines (2003-2017 Phantom models) also utilise two water-cooled alternators, part number AEK2864, due to high electrical load.

The newer 6.7 V12 engines use air-cooled alternators, AEG1647 and AEG1689, positioned on opposite sides of the engine, with air ducts for cooling. Autoelectro’s analysis suggests that the current engine design incorporates elements from previous 6.7 and 6.6 V12 engines, utilising two air-cooled 180A alternators instead of water-cooled systems.

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