Mercedes-Benz W126 - Engines

Engines

In September 1985, two newly constructed six-cylinder SOHC engines, M103 (already used in the new mid-sized Mercedes-Benz W124 series), replaced the 2.8-litre DOHC M110 engines. The carburetted version was replaced by a 2.6-litre fuel injection engine, while the 3.0-litre version replaced the fuel injected M110. Also new was a 4.2-litre V8 engine, designed to replace the 3.8 litre version used in the W126 sedans, coupés, and the SL-Class. The 5.0-litre engine was modified to receive electronic ignition and electronic-mechanical fuel injection in form of the Bosch KE-jetronic system. Performance was increased to 245 hp (183 kW). An ECE version of the 5.0-litre M117 V8 engine was also available from September 1987 with a power output of 265 hp (198 kW)

The largest new engine was the 5.6-litre V8 that was a further development from the 5 litre version. An increased stroke meant it could turn out a hefty 272 hp (203 kW). There was a higher compression version available, if required, that produced 300 hp (220 kW). This version was only available without catalytic converter. But even without the catalytic converter this ECE version, as it was known, would meet the emission requirements of the European community.

A 3.0-litre inline-five cylinder turbo diesel was offered from 1981–1985 in North America. In 1986, the 300SD was replaced with the 300SDL. It was part of the second generation of W126 model lineup. The five-cylinder engine was replaced with the new inline six-cylinder engine and the engine was only offered in long-wheelbase. The new engine had 148 hp (110 kW) compared to 125 hp (93 kW) of the previous version. California specification 1986 and all 1987 cars were the first diesel cars to have a diesel particulate filter. This early implementation did not hold up under normal use, and was replaced by a standard diesel oxidization catalyst in the course of a recall.

Engine Cyl. Power Torque 0–100 km/h Maximum speed Notes
Gasoline
2.6 12V I6 166 PS (122 kW; 164 hp) 228 N·m (168 lb·ft) 205 km/h (127 mph) From MY 1986
2.6 12V* I6 160 PS (118 kW; 158 hp) 220 N·m (162 lb·ft) 205 km/h (127 mph) From MY 1986
2.8 12V carb. I6 156 PS (115 kW; 154 hp) 223 N·m (164 lb·ft) 11.0s 200 km/h (124 mph) MY 1980–1985
2.8 12V inj. I6 185 PS (136 kW; 182 hp) 240 N·m (177 lb·ft) 10.0s 210 km/h (130 mph) MY 1980–1985
3.0 12V* I6 180 PS (132 kW; 178 hp) 255 N·m (188 lb·ft) 210 km/h (130 mph) From MY 1986
3.0 12V I6 188 PS (138 kW; 185 hp) 260 N·m (192 lb·ft) 210 km/h (130 mph) From MY 1986
3.8 16V V8 218 PS (160 kW; 215 hp) 299 N·m (221 lb·ft) 215 km/h (134 mph) MY 1980–1981
3.8 16V V8 204 PS (150 kW; 201 hp) 315 N·m (232 lb·ft) 9.3s 205 km/h (127 mph) MY 1982–1985
4.2 16V* V8 204 PS (150 kW; 201 hp) 310 N·m (229 lb·ft) 210 km/h (130 mph) MY 1986
4.2 16V V8 218 PS (160 kW; 215 hp) 330 N·m (243 lb·ft) 9.0s 218 km/h (135 mph) MY 1986
4.2 16V* V8 224 PS (165 kW; 221 hp) 325 N·m (240 lb·ft) 8.3s 218 km/h (135 mph) From MY 1987
4.2 16V V8 231 PS (170 kW; 228 hp) 335 N·m (247 lb·ft) 8.1s 222 km/h (138 mph) From MY 1987
5.0 16V V8 223 PS (164 kW; 220 hp) 365 N·m (269 lb·ft) 8.0s 220 km/h (137 mph) From MY 1986
5.0 16V V8 240 PS (177 kW; 237 hp) 402 N·m (296 lb·ft) 225 km/h (140 mph) MY 1980–1981
5.0 16V V8 231 PS (170 kW; 228 hp) 405 N·m (299 lb·ft) 8.1s 220 km/h (137 mph) MY 1982–1985
5.0 16V V8 245 PS (180 kW; 242 hp) 400 N·m (295 lb·ft) 7.6s 230 km/h (143 mph) MY 1986
5.0 16V* V8 223 PS (164 kW; 220 hp) 358 N·m (264 lb·ft) 220 km/h (137 mph) MY 1986
5.0 16V* V8 252 PS (185 kW; 249 hp) 390 N·m (288 lb·ft) 7.5s 230 km/h (143 mph) From MY 1987
5.0 16V V8 265 PS (195 kW; 261 hp) 405 N·m (299 lb·ft) 7.3s 235 km/h (146 mph) From MY 1987
5.6 16V* V8 242 PS (178 kW; 239 hp) 390 N·m (288 lb·ft) 7.6s 228 km/h (142 mph) MY 1986
5.6 16V* V8 279 PS (205 kW; 275 hp) 430 N·m (317 lb·ft) 7.2s 240 km/h (149 mph) From MY 1987
5.6 16V V8 272 PS (200 kW; 268 hp) 421 N·m (311 lb·ft) 250 km/h (155 mph) MY 1986
5.6 16V RÜF V8 299 PS (220 kW; 295 hp) 456 N·m (336 lb·ft) 250 km/h (155 mph) From MY 1987
5.6 16V ECE V8 299 PS (220 kW; 295 hp) 455 N·m (336 lb·ft) 6.9s 250 km/h (155 mph) MY 1986/87
Diesel
3.0 TD I5 125 PS (92 kW; 123 hp) 245 N·m (181 lb·ft) 15.0s 170 km/h (106 mph) MY 1980–1985
3.0 TD I6 150 PS (110 kW; 148 hp) 273 N·m (201 lb·ft) 13.0s 195 km/h (121 mph) MY 1986/87
3.5 TD I6 136 PS (100 kW; 134 hp) 310 N·m (229 lb·ft) 11.8s 175 km/h (109 mph) MY 1990/91
* = Catalyst version

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