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 R56 N18 Engine Rebuild Kit from SneedSpeed is a comprehensive engine overhaul solution engineered for R56 MINI Cooper S and JCW models powered by the turbocharged N18 engine. This kit consolidates all critical bottom-end and top-end wear components into a single, coordinated package designed to restore reliability, stabilize performance, and establish a durable foundation for increased output.

This is not a parts bundle.
It is a controlled engine reset that allows future decisions to be intentional rather than corrective.

One Kit — Controlled Build Range

The N18 rebuild kit supports multiple operating scopes using the same core architecture, differentiated by internal strength and retention strategy rather than airflow or camshaft changes.

Configured correctly, it supports:

• OEM-level engine refresh (Street reliability)

• Performance-oriented street builds

• Super Sport output levels through stronger internals and tuning

There are no alternate camshaft paths on the N18 platform. Progression occurs through bottom-end durability, fasteners, and calibration, not valvetrain escalation.

Core Components (Standard Kit)

The base kit includes the critical components required to complete a professional N18 rebuild and restore compression, sealing, and rotational stability:

• Pistons and piston rings (selected sizing)

• Main and rod bearings

• Head gasket

• Complete gasket and seal set

• Timing chain and tensioner components

• Head bolts (with stud upgrade option)

• Rod bolts

• Cryo-hardened timing chain kit option

All components are selected to work as a matched system, eliminating compatibility risk and rebuild guesswork.

Component Options & Configuration Control

Piston & Ring Options

• Street Series — durable, direct-replacement pistons for stock bore or oversize

• Forged Series — increased load tolerance for higher boost and sustained output

Bearing Options

• Street Series bearings — OEM-equivalent durability

• Performance coated bearings — improved load capacity for higher output and sustained RPM

Head Gasket & Fastener Options

• Street head gasket — OEM-equivalent sealing

• Performance MLS head gasket — improved sealing margin under higher cylinder pressure

• Head bolt or stud configuration — studs provide increased clamp stability under elevated boost

Rod Bolt Options

• Street rod bolts — OEM replacement

• Performance rod bolts — improved reliability under higher load with stock rods

Timing System

• Standard timing components

• Cryo-hardened timing chain upgrade — reduced stretch and improved durability over OE chain

Why This Kit Matters

Restores Engine Health

A complete rebuild restores compression integrity, stabilizes oil control, and replaces known wear components—returning the N18 engine to a predictable, reliable baseline.

Supports Higher Output Without Complexity

By strengthening the bottom end and sealing systems, the engine can safely support increased boost and calibration changes without altering factory cam timing or drivability.

Scales Without Rework

The same architecture supports Street and Super Sport output levels. Stronger internals and fasteners allow progression without reopening the engine.

Reduces Rebuild Risk

Every component is selected to work together, minimizing assembly errors and eliminating mismatched parts common in pieced-together rebuilds.

Ideal Applications

• Engine refresh on worn or high-mileage N18 engines

• Rebuild prior to ECU tuning

• Street performance builds with long-term durability goals

• Super Sport output levels without Race-only complexity

R56 N18 Engine Rebuild Kit — Configuration Comparison

Summary

The R56 N18 Engine Rebuild Kit establishes a stable, durable engine foundation that supports both Street and Super Sport output levels using the same core architecture. Strength is added where it matters—internals, sealing, and retention—while preserving factory cam timing, drivability, and reliability.