When pushing the BMW S68 platform beyond factory limits, the aluminum block becomes the weak link. The VAC Motorsports Flanged Cylinder Sleeves for BMW S68 are engineered to eliminate that limitation--delivering the strength, stability, and reliability required for high-boost, high-horsepower builds.
Manufactured from centrifugally cast ductile iron, these flanged sleeves are designed for extreme cylinder pressure, elevated temperatures, and sustained high-load operation. The flanged design provides superior deck support, dramatically reducing the risk of cylinder movement, distortion, or cracking under aggressive performance conditions.
Whether you're planning a high-boost turbo build, increasing displacement, or future-proofing an S68 for long-term durability, VAC flanged sleeves provide the foundation needed for reliable power.
Key Features & Benefits
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Flanged Design for Maximum Strength
Integrated top flange reinforces the deck surface, improving cylinder stability and head gasket sealing under extreme boost and combustion pressure.
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Centrifugally Cast Ductile Iron Construction
Significantly stronger than factory Alusil cylinder walls, offering superior resistance to cracking and distortion in high-power applications.
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Supports Increased Bore Size
Enables larger bore diameters for increased displacement, airflow, torque, and horsepower potential.
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Custom Cylinder Wall Thickness
Optimized wall thickness allows builders to tailor strength for high-boost and forced-induction builds.
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Improved Thermal Stability
Enhanced heat transfer and resistance to hot spots help maintain consistent operating temperatures in demanding performance environments.
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Built for Extreme Performance Builds
Ideal for turbocharged, high-compression, and competition-level engine builds where reliability is non-negotiable.
Important: Cylinder sleeve installation is a precision machining process and must be performed by an experienced engine machine shop familiar with BMW performance engines.