Available from 2015, the Mercedes-AMG M177 and M178 are biturbo 4.0-litre V8 petrol engines. Manufactured at Mercedes-AMG’s Affalterbach plant, the M177 and M178 engines have 90-degree ‘V’ angle cylinder banks and capacities of 3982 cc with 83.0 mm bores and 92.0 mm strokes. With their cast aluminium closed-deck blocks and zirconium alloy cylinder heads, the M177 and M178 engines have a dry weight of 209 kg.
| Engine |
Capacity |
Peak power |
Peak torque |
Models |
Years |
| M177 DE 40 AL |
3982 cc |
350 kW at 5500-6250 rpm |
650 Nm at 1750-4500 rpm |
W205 C 63 |
2015-on |
| 375 kW at 5500-6250 rpm |
700 Nm at 1750-4500 rpm |
W205 C 63 S |
2015-on |
| M178 DE 40 AL |
3982 cc |
340 kW at 6000 rpm |
600 Nm at 1600-5000 rpm |
C190 GT |
2015-on |
| 375 kW at 6250 rpm |
650 Nm at 1750-4750 rpm |
C190 GT S |
2015-on |
Other features of the 4.0-litre M177 and M178 V8 engines include two turbochargers positioned between the cylinder banks which provide maximum boost pressure of 1.2 bar (17.4 psi), direct petrol injection with piezo injectors (maximum fuel pressure of 200 bar), cylinder bore liners with ‘Nanoslide’ technology, double overhead camshafts (chain-driven), variable inlet and exhaust valve timing, four valves per cylinder actuated by roller finger followers, a compression ratio of 10.5:1 and maximum engine speed of 7000 rpm. The M177 and M178 engines will both have an ECO start/stop function and comply with Euro 6 emissions standards.
While the M178 engine will have dry sump lubrication, the M177 engine will have a conventional oil sump and lubrication system.
The M177 and M178 replaced Mercedes-Benz’s biturbo 5.5-litre M157 engine.
