MERCEDES AMG GT ENGINE REVEALED
As expected, the new heart is a twin-turbo 4.0 litre V8 developed entirely by the brains at AMG to be one of the most powerful engines of its type.
The new 3982cc ‘M178’ engine will fill the chests of a number of new models, but it will start by sending 375kW through the coming new AMG GT.
Revving to 7200rpm, the new turbo V8 will turn on peak power at 6250rpm - a full 750rpm earlier than the 6.2 litre M159 V8 that it replaces.
There’s also 650Nm of torque available from just 1750rpm - 3000rpm earlier than in the 6.2 litre unit - and that continues through to 4750rpm.
In all, the new mill delivers a specific output of 94.2kW per litre - 26.5kW more per litre than the M159 in the standard SLS AMG.
Of course, it is likely that AMG will squeeze a good deal more power out of this engine over time, with the most potent example of the outgoing 6.2 litre engine capable of delivering a huge 470kW.
There’s 83mm bore and 92mm stroke dimensions - just as there is with the small A 45 ‘s 2.0 litre turbo four-cylinder engine - and a compression ratio of 10.5:1.
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 1.3 bar of pressure and benefiting from a water-to-air intercooler.
That layout, AMG engine boss Christian Enderle says, helps to make the new engine nearly 90mm shorter than the M159.
Performance details for the new engine are still to come - of course - but reports suggest that in the AMG GT, a 0-100km/h time of 3.8 seconds is on the cards. Fuel consumption should also be vastly improved over the SLS AMG’s 13.2 l/100km.
This same engine is expected to appear next in the new C 63 AMG, likely to be followed by the next E 63 AMG and more.
Watch for more details to come in the lead-up to the AMG GT's Paris debut in October, and catch our ongoing coverage at the links below.