S55 Wet-Style Cylinder Sleeves Upgrade
900 HP Calibrated · 1100 HP Burst Limit
High-performance wet-style cylinder sleeve upgrade for S55 engines.
Engine package built to support 900 HP continuous output, with up to 1100 HP peak burst limit under controlled conditions.
Item Specifics
- Engine Type: S55 3.0L Turbocharged I6
- Upgrade Type: Wet-Style Cylinder Sleeves Upgrade
- Continuous Power Rating: 900 HP
- Burst Power Limit: 1100 HP (Structural Max)
- Sleeve Material: High‑strength steel, precision‑machined
- Condition: Brand New · Custom Machined Sleeves
Included/Upgraded Components
- Custom High‑Pressure Fuel Pump (HPFP)
- Reinforced Main & Rod Bearings (Big End & Main Journals)
- Forged Connecting Rods
- Forged Pistons (oversize‑ready)
- Reinforced Rod Bolts
- Upgraded Valve Train: valves, springs, seats, seals
- Wet‑Style Reinforced Cylinder Sleeves (oversize possible)
- Upgraded Cylinder Block / Middle Block Bolts
Applicable Part Numbers / Reference Numbers
- 11 21 8095 728
- 11 21 8095728
- 1121 8095 728
- 11218095728
- 1121 7846 606
- 11217846606
- 11214809217
- 11117853845
- 11117846766
Compatible Vehicle Models (for S55 Engine)
- FOR 2' F87 M2 LCI
- FOR 3' F80 M3 LCI
- FOR 3' F80 M3
- FOR 4' F82 M4
- FOR 4' F82 M4 LCI
- FOR 4' F83 M4
- FOR 4' F83 M4 LCI
- FOR MS — BMW Motorsport M4 GT4
Product Description
This wet-style cylinder sleeves upgrade for the S55 engine is engineered for extreme performance and sustained high‑boost applications. Reinforced sleeves, forged internals and upgraded valvetrain ensure the engine block can safely produce 900 HP continuous and withstand up to 1100 HP burst peak (structural limit).
- Wet‑style sleeves optimized for coolant contact — better heat dissipation under sustained load.
- High‑strength steel sleeves and forged internals provide maximum durability under very high cylinder pressures and temperatures.
- Oversize‑ready machining allows future piston upgrades if needed.
- Ideal for turbocharged high‑boost setups, track builds, or high‑performance street use.
Compression Ratio & Boost Setup Note:
Before final piston/sleeve configuration, please confirm whether the build aims for high boost or lower boost — this determines whether we setup a high or lower compression ratio for safe and optimal performance.
Processing & Delivery Time
Custom machining and quality‑control required — ~30 business days for sleeve production and final inspection.
Shipping (Sea Freight Recommended)
Due to size and weight, we recommend shipping by sea freight.
Sleeves will be crate‑packaged for secure delivery.
Estimated transit: 4–8 weeks depending on destination.
Warranty & Disclaimer
No warranty is provided for this performance upgrade — safe operation depends on correct installation, appropriate supporting systems (fuel, cooling, tuning), and proper use.
We guarantee the quality of materials and machining precision — sleeves are crafted from high‑strength steel and machined to tight tolerances to ensure performance and longevity under high load.
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