Affalterbach. Mercedes-AMG presents a new technological masterpiece: the AMG 4.0-litre V8 biturbo engine is a new development at the sporting heart of the new Mercedes-AMG GT car. This innovative eight-cylinder unit stands out for its sublime power delivery, the purposeful lightweight construction, as well as its high efficiency and environmental compatibility. With peak power of up to 375 kW (510 hp) and maximum torque of up to 650 Nm the new AMG V8 delivers motorsport-inspired performance. The new sports car engine follows in an impressive V8 tradition that started in 1967 with the M100 in the legendary 300 SEL 6.8 AMG racing car and continues with trendsetting features of the future.
|Valves per cylinder||4|
|Bore x stroke||83.0 x 92.0 mm|
|Cylinder spacing||90 mm|
|Compression ratio||10.5 : 1|
|Output||375 kW (510 hp) at 6250 rpm|
|Output per litre||94.2 kW/litre / 128 hp/litre|
|Max. torque||650 Nm at 1750 – 4750 rpm|
|Torque per litre||163.2 Nm/litre|
|Maximum engine speed||7200 rpm|
|Maximum charge pressure||1.2 bar|
|Peak pressure||130 bar|
|Engine weight (dry)||209 kg|
|Emissions standard||Euro 6|
Efficient cooling of charge air, water and engine oil
For optimum power output even when outside temperatures are high, Mercedes-AMG uses indirect air/water intercooling. The charge air cooler has a separate, low-temperature water circuit. Due to the optimised throughflow profile for the intercooler, the maximum intake air temperature is 180 degrees Celsius. The low-temperature cooler with its water circuit ensures that the intake air compressed by the turbochargers cools down effectively before it enters the combustion chambers, and maintains a consistently low intake temperature even under full load. A large radiator at the car's front end ensures controlled cooling of the water circulating in the low-temperature circuit. Extremely short charge-air ducting makes for optimum responsiveness.
The engine coolant is cooled using the particularly efficient cross-flow principle and there is a three-phase thermostat to warm coolant faster. Because the water pump is driven by a timing chain rather than the usual poly-V-belt, a simplified belt drive system is used with less clamping force. The advantages: less loss of drive power. With a rated flow of 420 litres, the water pump conveys the equivalent of more than two full bathtubs per minute.
An external engine oil cooler in the front apron of the Mercedes-AMG GT helps with heat management for the V8 engine. A two-stage, controlled oil pump circulates the engine oil: it varies the flow rate depending on load and engine speed requirement, thereby benefiting fuel economy. At high engine speeds more than 1.0 litre of engine oil per second flows through the oil lines and ducts. To save on weight numerous oil and water lines are made of aluminium.
Sophisticated solutions are also deployed on the engine's periphery: