Mercedes-Benz M103 engine
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The Mercedes-Benz M103 was a straight-6 automobile engine produced from 1986 through 1993. It was a single overhead cam design with 2 valves per cylinder. The M103 was replaced by the DOHC M104 starting in 1990.
[edit] 3.0
The 3.0 L M103 (2960 cc)(181 cu in) version produced 177 hp (131 kW) at 5700 rpm and 188 ft·lbf (254 Nm) at 4400 rpm. It used the CIS-E (Continuous Injection System - Electronic) and had a bore of 88.5 mm (3.48 in) and a stroke of 80.2 mm (3.16 in). The compression ratio was 9.2 : 1 with a redline of 6550 rpm in 1987 and 6200 rpm from 1988 on. The firing order was 1-6-3-4-2-5. Recommended fuel octance for the M103 is 91 RON/MON (96 RON)(86 MON). This engine was found in the W124 E-Class, W126 S-Class.
[edit] 2.6
A smaller 2.6 L M103 (2597 cc)(158 cu in) version of the M103 produced 158 hp (118 kW) at 5800 rpm and 162 lb-ft (219 Nm) at 4600 rpm. It also used the CIS-E engine management system and had a bore of 82.9 mm (3.26 in) and a stroke of 80.2 mm (3.16 in). The only technical data changes from the M103 3.0 L to the M103 2.6 L was the bore and the stroke. This engine was found in the W201 Mercedes-Benz E-Class and W124 E-Class.
