![]() A timing chain was used instead of a timing belt, to reduce servicing requirements.Electronic Throttle Control instead of a mechanical throttle cable. ![]() Airflow measurement using Mass air flow sensors (MAFs) instead of Air flow meters (AFMs) to improve fuel economy.Aluminium alloy engine block ( AluSil) instead of cast-iron (both engines have an aluminium cylinder head), to reduce weight.The M70 has the following differences with the M20 engine: The M70's design is similar to that of two 2.5 L M20 straight-six engines joined at a 60 degree angle, due to the following features: single overhead camshaft valvetrain, bore spacing of 91 mm (3.6 in), bore of 84 mm (3.31 in), stroke of 75 mm (2.95 in), and a compression ratio of 8.8:1. The BMW S70/2 engine, largely unrelated to the M70 and S70B56 engines, is a naturally-aspirated, DOHC, V12 petrol engine, which powered the 1993 to 1998 McLaren F1. The BMW M70 is a naturally-aspirated, SOHC, V12 petrol engine, which was BMW's first production V12 and was produced from 1987 to 1996.
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