
BMW’s new and upcoming E92 BMW M3 marks the shift to V8 power after 15 years of six-cylinder power. The E46 M3’s 3.2 liter straight-six was a legend, and is still being used by the current Z4 M Coupe and Roadster. The engine clinched the Engine of the Year award multiple times. It made 343hp in it’s latest edition. But in it’s main application in the M3, it’s time for it to bow and leave the stage and make way for it’s successor, the new BMW M V8 engine.
This new engine displaces 3,999cc and makes 420hp at 8,300rpm, It is a screamer, revving all the way to a redline of 8,400rpm. Torque peaks at 3,900rpm with 400 newton meters, with 340Nm available from as low as 2,000rpm. The new 4.0 liter V8 is also amazingly lighter than the 3.2 liter inline-6 it replaces, weighing in at a mere 202kg, 15kg lighter than the inline-6, despite an additional 2 cylinders and all the extra valvetrain parts for a 90 degree V-design.
The valvetrain uses double-VANOS variable camshaft control now with a new low pressure design, and intake is via eight individual throttle butterflies for the best in engine response time. And of course, in line with BMW’s new Efficient Dynamics plan, it has Brake Energy Regeneration, usually not found in non-hybrid cars.
While it all looks impressive, I was expecting more torque than this, however it’s very commendable that BMW managed to make most of the torque available from a relatively low RPM, despite the very wide rev range that peaks at 8,300rpm. I wonder why BMW decided not to fit the engine with direct injection.
Somehow I feel the M3 is not going to be as exciting as I thought it would be. Sure, it’s an M3, and I would love the chance to drive it if somehow circumstances let me. But just not that much. I reckon a 335i M Sport tuned up to the regions of 370hp and ALOT more torque than the 400Nm this V8 makes as well sounds like the better deal. Just give it a Hartge LSD for it to keep up with the M3 with that wonderful M differential around the corners. But of course that’s all aftermarket and in the end, it still wouldn’t be an M3. It would just be a tricked out 335i. And later, a tricked out M3 will come along and smoke it.
Please head on to the BMW M3 V8 Engine Photo gallery for a collection of high resolution photos as well as an image showing the torque curve of this new engine.
A full technical press release is after the jump.
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BMW M3 Concept at Geneva 2007
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Click here to read the rest of The New BMW M3 V8 Engine Specifications