R56 N18 MINI Cooper S / JCW engine rebuild kit

R56 N18 MINI Cooper S / JCW Engine Rebuild Kit

Street · Super Sport Foundation · Upgrade-Ready Architecture

The SneedSpeed R56 N18 Engine Rebuild Kit is a complete, purpose-engineered solution for rebuilding the turbocharged N18 engine found in R56 MINI Cooper S and JCW models. It consolidates all critical bottom-end and top-end wear components into a single, matched system designed to restore reliability, stabilize performance, and create a durable foundation for future power increases.

This is not a loose collection of parts.
It is a controlled engine reset—so future upgrades are intentional, not corrective.

One Kit. Multiple Build Levels.

The N18 platform does not progress through camshaft changes or valvetrain escalation. Power and durability are achieved through bottom-end strength, sealing integrity, fastener retention, and calibration.

This rebuild kit uses a shared core architecture that supports multiple output levels depending on internal configuration:

• Street — OEM-plus reliability and daily drivability

• Performance Street — stronger internals for tuned applications

• Super Sport Foundation — sustained boost capability with upgraded components

Configured correctly, the same engine build can scale without reopening the motor.

Core Components (Standard Kit)

Every kit includes the essential components required for a professional N18 rebuild, restoring compression, oil control, and rotational stability:

• Pistons and piston rings (STD or oversize)

• Main and connecting rod bearings

• Head gasket

• Complete engine gasket and seal set

• Timing chain and tensioner components

• Head bolts (stud upgrade optional)

• Rod bolts

• Optional cryo-hardened timing chain upgrade

All components are selected as a matched system, eliminating compatibility issues and rebuild guesswork.

Configuration Options & Build Control

Pistons & Rings

• Street Series — durable, direct-replacement pistons

• Forged Series — increased strength for higher boost and sustained load

Bearings

• Street bearings — OEM-equivalent durability

• Performance coated bearings — increased load capacity and oil film stability

Head Gasket & Fasteners

• Street head gasket — OEM-equivalent sealing

• Performance MLS gasket — improved sealing under elevated cylinder pressure

• Head bolts or stud kit — studs increase clamp stability for tuned engines

Rod Bolts

• Street rod bolts — OEM replacement

• Performance rod bolts — improved reliability at higher RPM and load

Timing System

• Standard timing components

• Cryo-hardened timing chain upgrade — reduced stretch and extended service life

Why This Kit Matters

Restores Engine Health

Replaces known N18 wear points, restores compression integrity, and stabilizes oil control—returning the engine to a predictable, reliable baseline.

Supports Power Without Complexity

Strength is added where it matters most: internals, sealing, and fasteners. No camshaft changes, no drivability compromise.

Scales Without Rework

Street and Super Sport builds share the same architecture. Upgraded internals allow future tuning without tearing the engine back apart.

Reduces Rebuild Risk

A single, cohesive system minimizes assembly errors and eliminates mismatched components common in pieced-together rebuilds.

Ideal Applications

• High-mileage or worn N18 engine refresh

• Rebuild prior to ECU tuning

• Long-term street performance builds

• Super Sport output levels without race-only complexity

Configuration Comparison

Summary

The R56 N18 Engine Rebuild Kit delivers a stable, upgrade-ready engine foundation that supports both Street and Super Sport output levels using the same proven architecture. Durability is engineered into the internals, sealing, and retention systems—while preserving factory cam timing, drivability, and long-term reliability.

This is how you rebuild once—and build forward.