The tuning arm of Mercedes-Benz, AMG, has further detailed its new turbocharged ‘M178’ V8 engine this week.
Already known is that the 4.0 litre turbocharged V8 will deliver 375kW and 650Nm in its most basic form, although we can likely expect meaner versions to appear over time in special-edition models.
Boasting a 7200rpm redline, the new V8 will hand in peak power at 6250rpm - bettering the venerable 6.2 litre M159 engine by a good 750rpm.
Likewise, max torque comes on at 1750rpm - 3000rpm earlier than with the bigger engine - and continues on in the new engine to 3000rpm.
AMG is also talking up the new mill’s specific output, rated at 94.2kW per litre - 26.5kW more per litre than the M159 in the standard SLS AMG.
The new engine’s figures also give away its relationship to the small A 45 AMG’s 2.0 litre turbo engine, with both sharing the same 83mm bore and 92mm stroke measurements.
This is combined with a compression ratio of 10.5:1, compared with an inevitably low 8.6:1 in the A 45.
Features of the new quad-cam engine include direct injection, flow-optimised cylinder heads with a nano-slide coating to the walls, forged internals, and dry sump lubrication to eliminate the need for a conventional oil pan and lowering the centre of gravity as a result.
Those cylinder heads include zirconium alloy in their makeup, promising maximum temperature and thermal conductivity.
The M178’s two Borg Warner turbochargers are nestled between the 90-degree cylinder banks generating 1.2 bar of pressure and benefiting from a water-to-air intercooler.
That layout, which AMG described as a ‘hot inside V’ formation, helps to make the new engine nearly 90mm shorter than the M159.
AMG says that shortened length, combined with the engine’s advanced design and materials, help to make the M178 the lighest engine in its class.
Of course, all of this reaffirms that not only is the iconic V8 engine far from dead, but that - according to AMG chairman Tobias Moers - the concept forms “an integral part of the AMG philosophy and the brand’s commitment to ‘Driving Performance”.
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