N14 SneedSpeed Crate Engine

Street · JCW Spec · Super Sport · Race

The N14 SneedSpeed Crate Engine is a fully assembled long block replacement engineered by SneedSpeed for turbocharged N14-powered MINI Cooper S and John Cooper Works models.

Designed to address common N14 engine failures while delivering dependable performance, each engine is built around a specific purpose—from factory-style daily driving to high-performance street and competition applications.

Whether you're restoring your MINI to factory specifications, replacing a failed John Cooper Works engine, or building a high-horsepower performance car, SneedSpeed offers an engine configuration matched to your goals.

This isn't simply a collection of replacement parts. It's a complete, professionally assembled engine built with carefully selected components, precise clearances, and SneedSpeed's engine-building experience.

One Engine Program — Four Performance Levels

The SneedSpeed N14 Crate Engine is available in four configurations:

• Street Series: Factory-style reliability and everyday drivability.

• JCW Spec Series: Factory John Cooper Works compression and power capability.

• Super Sport Series: Forged internals and performance upgrades for demanding street and track use.

• Race Series: Maximum airflow, high-RPM capability, and competition-focused performance.

Each configuration is engineered around its intended use, with differences in internal components, cylinder head preparation, camshaft profiles, and valvetrain specifications.

JCW owners: For detailed information about our JCW engine construction, A-code versus C-code blocks, compression ratio, and factory power capability, see the JCW Technical Information section at the bottom of this listing.

Core Assembly Standards — All Builds

Every SneedSpeed N14 Crate Engine is built to our established assembly and inspection standards.

• Fully rebuilt N14 engine block

• New pistons and piston rings

• New engine bearings

• New gaskets and seals

• Balanced rotating assembly

• Inspection and correction of common N14 wear and failure points

• Precision assembly and component clearances

• Fully assembled long block, ready for installation

All four configurations receive the same attention to machining, assembly quality, and durability.

Build Levels Explained

Street Series — OEM+ Reliability

The Street Series is designed for daily-driven MINI Cooper S models where dependable operation, factory-like performance, and long-term reliability are the priorities.

This engine provides a complete refresh of the N14 platform while retaining the smooth drivability and operating characteristics of the original engine.

Street Series Features

• SneedSpeed Street Series cast pistons

• OEM-type connecting rods

• Remanufactured, unported cylinder head

• Street camshaft profile

• Stock-specification valve springs

• Factory-style idle and drivability

• Designed for stock and mildly modified applications

Best For: Daily drivers, factory engine replacements, and owners who want dependable OEM-style performance.

JCW Spec Series — Factory John Cooper Works Performance

The JCW Spec Series is engineered specifically for N14-powered John Cooper Works models.

Built to reproduce the factory JCW 10.0:1 compression ratio, this engine is designed to retain the original JCW power capability, throttle response, and driving characteristics.

SneedSpeed builds JCW Spec engines using our own piston specification and a 1.2 mm head gasket to achieve the intended factory compression ratio.

JCW Spec Features

• SneedSpeed N14 pistons

• Factory JCW 10.0:1 compression specification

• 1.2 mm head gasket

• OEM-type connecting rods

• Remanufactured, unported cylinder head

• JCW-compatible camshaft and valvetrain configuration

• Designed for factory JCW power output

• Compatible with factory JCW supporting systems

Best For: Factory John Cooper Works engine replacements, JCW restorations, and owners who want to maintain their original performance characteristics.

A-code and C-code engine cores are both used in our JCW program. C-code-specific builds are available by special order at additional cost and with a longer lead time.

See the complete JCW Technical Information section below for details.

Super Sport Series — Street & Track Performance

The Super Sport Series is engineered for enthusiasts who want substantially greater performance capability while retaining excellent street manners.

With forged internal components, upgraded camshaft specifications, and performance valve springs, this engine provides a stronger foundation for increased boost, aggressive tuning, and demanding driving conditions.

Super Sport Series Features

• SneedSpeed Forged Super Sport Series 4032 pistons

• Forged connecting rods

• Remanufactured, unported cylinder head

• Super Sport camshaft profile

• Performance valve springs matched to Super Sport camshaft specifications

• Increased strength for higher cylinder pressures

• Strong midrange torque and broad, usable powerband

• Suitable for performance street and mixed street/track applications

Best For: Modified street cars, upgraded turbocharger applications, spirited driving, and occasional track use.

Race Series — Maximum Performance & RPM Capability

The Race Series is designed for high-output N14 builds where airflow, engine speed, and maximum performance take priority.

Using the same forged bottom-end foundation as the Super Sport Series, the Race engine adds a SneedSpeed ported cylinder head, Race camshaft profile, and matched performance valve springs.

These upgrades are designed to improve cylinder head airflow and volumetric efficiency at elevated engine speeds.

Race Series Features

• SneedSpeed Forged Super Sport Series 4032 pistons

• Forged connecting rods

• SneedSpeed remanufactured and ported cylinder head

• Race camshaft profile

• Performance valve springs matched to Race camshaft specifications

• Increased cylinder head airflow

• Improved high-RPM breathing and power potential

• Engineered for aggressive tuning and competition applications

Best For: Dedicated performance builds, high-output turbocharger applications, track cars, and competition vehicles.

Compare N14 Engine Configurations

All engines are built to SneedSpeed assembly, inspection, and quality standards.

The Super Sport and Race engines share a forged bottom-end foundation. Their primary performance differences are in cylinder head airflow, camshaft selection, and valvetrain configuration.

Applications

For MINI vehicles equipped with the turbocharged N14 engine, including:

• R55 MINI Cooper S / John Cooper Works Clubman

• R56 MINI Cooper S / John Cooper Works Hatch

• R57 MINI Cooper S / John Cooper Works Convertible

• R58 MINI Cooper S / John Cooper Works Coupe

• R59 MINI Cooper S / John Cooper Works Roadster

Applications depend on model year and engine code. Verify your vehicle has the N14 engine before ordering.

Choosing the Right SneedSpeed N14 Engine

Choose Street if you want a dependable replacement for your factory MINI Cooper S engine without major performance modifications.

Choose JCW Spec if you own a John Cooper Works MINI and want to retain the original JCW compression ratio and factory power capability.

Choose Super Sport if you're increasing boost, upgrading your turbocharger, or building a performance-focused street car.

Choose Race if your goal is maximum airflow, higher-RPM performance, and a dedicated competition-oriented engine.

Not sure which configuration is right for your build? Contact SneedSpeed. We can help select the appropriate engine based on your turbocharger, tuning plans, vehicle use, and performance goals.

JCW Technical Information

A-Code vs. C-Code Engines, Compression Ratio & Factory Power

We receive a lot of questions from John Cooper Works owners about the differences between A-code and C-code N14 engines.

Many customers specifically request a C-code block because their original JCW came equipped with one. We understand why maintaining the original factory specification matters, especially when replacing an expensive performance engine.

Here's how SneedSpeed builds our JCW Spec engines and why the original core code isn't the only factor that determines the finished engine's performance.

How SneedSpeed Builds a JCW Spec Engine

The factory N14 John Cooper Works engine uses a 10.0:1 compression ratio.

To reproduce that specification, SneedSpeed uses our own N14 piston specification combined with a 1.2 mm head gasket.

This combination is selected to achieve the intended factory JCW compression ratio when the engine is properly assembled.

We use both A-code and C-code N14 engine cores in our JCW program.

Rather than relying exclusively on the original engine code, we build the engine around the finished compression specification and the components required for the intended JCW application.

Will It Make the Same Power as My Original JCW Engine?

Our JCW Spec engine is designed to support the same factory power output as your original John Cooper Works engine.

The US-market N14 John Cooper Works engine was factory rated at approximately 208 horsepower.

By reproducing the factory JCW compression specification and maintaining compatibility with the original JCW turbocharger, fuel system, ECU calibration, and supporting components, our engine is engineered to retain the performance characteristics expected from a factory JCW.

The engine itself is only one part of the complete power system. Actual installed horsepower depends on the condition of the turbocharger, fuel delivery system, intake, exhaust, engine management, and other supporting components.

Our objective is to provide a properly rebuilt JCW engine capable of supporting factory power—not a lower-performance substitute.

Do I Need a C-Code Block?

No. A C-code core is not required to build an engine to our JCW compression specification.

SneedSpeed builds JCW Spec engines using both A-code and C-code cores.

Using our piston specification and 1.2 mm head gasket, we build the finished engine to the intended 10.0:1 JCW compression ratio.

The original core identification does not, by itself, determine the finished compression ratio of a properly rebuilt engine.

Both A-code and C-code-based JCW Spec engines are built to the same SneedSpeed JCW performance target.

Can I Order an Actual C-Code Engine?

Yes. SneedSpeed offers C-code-specific engine builds by special order.

For owners who want their replacement engine built specifically from a C-code core, we can source and build one.

Because C-code engine cores are less readily available, this option involves:

• Additional cost for sourcing the C-code core

• Longer engine build and delivery time

• The same SneedSpeed JCW compression and assembly specifications

The C-code option is available for customers who prefer the original engine identification, rather than because it is required to achieve our JCW Spec performance target.

Contact SneedSpeed for current C-code availability, pricing, and estimated build time.

The SneedSpeed JCW Approach

Our goal is simple: provide John Cooper Works owners with a properly built replacement engine that retains the performance their MINI was designed to deliver.

Whether built from an A-code or C-code core, every SneedSpeed JCW Spec engine is assembled around the same intended factory compression specification and performance requirements.

Factory JCW performance. SneedSpeed engine-building standards. Your choice of core.