BMW’s Legendary S54B32 Engine Is Retired
December 30th, 2008
BMW has retired its classic 3.2 liter inline six-cylinder engine. And when I say “classic” I mean probably the sweetest, most balanced, highest reving, most powerful naturally aspirated 3.2 liter engines we’ll ever be graced with.
The powerplant, known as the S54B32 amongst BMW engineers and automotive purists, powered the last generation Z4 M Roadster and Coupe, the M3 (E46) and a several earlier generation Z3 M Roadster and Coupes too. The 3.2 liter engine distinguished itself as a naturally aspirated straight-six churning out 343 hp - more than 100 hp per liter without any artificial induction. That simplicity and artfulness of engineering made the engine renowned for its steady levels of torque across the rev band.
One should always be weary when an automaker phases-out a classic product and replaces it with the new and unproven. How many times has a manufacturer messed up the process of renewal and actually taken a product line a few steps back? After all, this engine won the International Engine of the Year award upon its introduction in 2001 as well as winning the 3.0 to 4.0 liter category for six consecutive years between 2001 and 2006.
But this is BMW and maybe a little trust is warranted. They don’t usually leap blindly into the marketplace with under-developed products, especially engines.
The S54B32 will be replaced in the Z4 by other inline six-bangers, including a 2.5 liter, 201 hp and a twin-turbo 3.0 liter with 302 hp. Let’s hope those powerplants come packed with the same kind of supple sizzle.
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Break-Out diagram of Engine
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Cutout picture of Engine
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S54B32 Crank Shaft
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e46 M3 Header
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Double VANOS on M3
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M3 Cam Shaft
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Cut Out of BMW Intake Manifold
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Inline-6 M3 Intake Manifold
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Pistons and Valves
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Stripped Engine Block
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Drivetrain on Imola Red M3
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e46 BMW Drivetrain Diagram
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M3 Vehicle Diagram
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BMW M3 Undercarriage
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Phoenix Yellow M3
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M3 Engine Bay
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BMW M3 Engine
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e46 M3 Headers
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e46 BMW M3 S54B32 Torque and Horsepower Curve
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