8/8/2019 Saab 9-4X Powertrain

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18th October, 2010

New Saab 9-4X: Powertrain

Compact V6 Engine Delivers High Efficiency

• Compact six cylinder, 300 hp 2.8V6 turbo• Adaptive, six-speed automatic transmission

 The Saab 9-4X is powered by a compact six-cylinder engine, featuringadvanced technologies that deliver power ratings typical of largerdisplacement engines, but with better fuel economy and lower emissions.

 The turbocharged, 2.8-litre V6 with 300 hp – as used in the new 9-5 saloon– is transversely-mounted and mated to a six-speed automatic transmissionwith Saab XWD.

 The engine features electronic management, electronic throttle control,direct ignition and four valves per cylinder operated by overhead,maintenance-free, chain-driven camshafts. Variable valve timing, on bothinlet and exhaust sides, allows the opening and closing of the valves to beadjusted according to engine speed and load. This enables a broaderspread of torque, higher maximum power and improved fuel consumption,

as well as better emissions control.

 To give minimal piston friction and wear characteristics, while alsobenefiting fuel and oil consumption, the cylinder walls of the engines arelaser-etched for an ultra smooth finish. Under-skirt piston oil cooling andsodium-filled exhaust valves are further efficiency measures.

A torque-based engine management strategy calculates an optimal throttleposition, cam phasing, ignition timing and turbo charge pressure for allengine loads and speeds.

2.8 V6 Turbo. This all-aluminum engine has a classic 60° angle between the cylinderbanks to give optimum balance for vibration-free running. It generates 300hp (2241kW) at 5,500 rpm and an impressive 400 Nm spread of torquebetween 2,000 and 5,000 rpm.

On the road, it delivers giving zero to 62mph acceleration in 8.3 seconds.Like all turbocharged engine, it offers performance typical of larger engine,while delivering better fuel economy when boost is not required.

 The single, twin-scroll turbocharger is mounted centrally above thetransmission and fed by both banks of cylinders. The use of two inlet tracts,

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one for each cylinder bank, separates the exhaust gas pulses, improvinggas flow, reducing energy losses and raising turbocharger efficiency. Theturbo is water-cooled and uses air-to-air intercooling to increase intake

charge density.

A strong, forged-steel crankshaft runs in four main bearings and the steelconnecting rods are sinter forged for extra strength and durability. Thepolymer-coated, aluminum pistons and the floating wrist-pins are cooledand further lubricated by triple under-skirt oil jets.

 The exhaust manifolds are double-skinned with hydroformed stainless steelliners to improve cold start emissions by minimizing heat absorption to themanifold. Air injection into each exhaust manifold for up to 30 secondsafter a cold start also helps the central pre-catalyst, positioned upstream of the main catalytic converter, achieve 'light off', its effective workingtemperature, as early as possible.

For smooth and quiet running, the cast aluminum oil pan is stiffened andbolted to the transmission bell housing, as well as the engine block,eliminating points of vibration. The camshaft covers are fully isolated andmade from composite material to provide an effective noise barrier.

 The six-speed automatic transmission includes an integrated electroniccontrol module, which eliminates the need for any external wiring. It

features an adaptive shifting logic, while adding manual gear selection viasteering wheel controls.

Fuel consumption figures are still being finalised and will be published

closer to launch.

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