Decades of BMW Engine Development. Built for Drivers Who Demand More.
For more than two decades, VAC Motorsports has been at the forefront of BMW engine development, engineering premium stroker kits for enthusiasts, racers, engine builders, and professional motorsport teams around the world.
A stroker kit isn’t simply about increasing engine displacement. It’s about transforming the way an engine delivers power. By increasing crankshaft stroke, a properly engineered stroker engine produces significantly more torque throughout the RPM range, improves throttle response, enhances drivability, and creates a broader, more usable powerband.
Whether you’re restoring a classic BMW, building a naturally aspirated road-race engine, creating a high-horsepower turbocharged street car, or assembling a professional competition engine, a VAC Motorsports stroker kit provides the foundation for an engine designed to perform at the highest level.
The VAC Difference
Every company can sell parts.
At VAC Motorsports, we engineer complete rotating assemblies.
Every component is selected because it contributes to the overall reliability, balance, and performance of the finished engine.
That philosophy has guided our engine program for decades and continues today across every BMW platform we support.
When you purchase a VAC Stroker Kit, you’re not simply buying a crankshaft and connecting rods—you’re investing in years of BMW-specific engineering experience.
Why Build a Stroker Engine?
Increasing engine displacement offers benefits that can’t be achieved through tuning alone.
A properly designed stroker engine delivers:
- Increased torque throughout the entire RPM range
- Stronger acceleration exiting corners
- Improved throttle response
- Faster turbocharger spool on forced induction applications
- Greater naturally aspirated horsepower potential
- Broader, more usable power delivery
- Increased engine flexibility for both street and race applications
Unlike modifications that only improve peak horsepower, a stroker kit changes the character of the engine every time you press the accelerator.
Engineering Without Compromise
Every VAC Stroker Kit follows the same engineering philosophy, regardless of engine family.
Premium Crankshafts
The crankshaft is the foundation of every rotating assembly.
For our premium applications, VAC partners with Arrow Precision, whose crankshafts are recognized worldwide for exceptional metallurgy, precision machining, and motorsport durability.
The original VAC S54 stroker crankshaft was designed in collaboration with Neil Walker, formerly of the Judd Formula One program and a consultant to Arrow Precision. That Formula One pedigree helped establish the engineering standards that continue to influence our premium stroker program today.
Connecting Rod Options
Every engine build has different goals.
Rather than offering a single solution, VAC allows customers to choose the connecting rod that best matches their performance objectives and budget.
Arrow Precision
Our ultimate no-compromise connecting rod, engineered for customers who demand the highest level of quality, precision, and motorsport performance.
CP-Carrillo Rods
A premium forged connecting rod with an outstanding reputation for durability in high-performance street and race engines.
SP Components
An excellent value for customers seeking a quality forged connecting rod while maintaining a more budget-conscious build.
Our goal is never to sell the most expensive component. It’s to recommend the right component for your application.
Premium Pistons
Most VAC stroker kits are paired with premium forged pistons from CP-Carrillo, with additional options available depending on engine platform, compression ratio, fuel selection, and intended use.
Each engine combination is designed around your specific performance goals—not a one-size-fits-all approach.
Bearings Matter
The rotating assembly is only as reliable as the bearings supporting it.
That’s why VAC recommends pairing every stroker kit with our premium rod and main bearing kits, featuring proven bearing technology and coated options for demanding street and motorsport applications.
ARP Fasteners
A premium rotating assembly deserves premium clamping force.
VAC recommends ARP fasteners throughout the engine to provide consistent, reliable clamping under extreme cylinder pressures and high-RPM operation.
Harmonic Control
As displacement, torque, and RPM increase, controlling crankshaft torsional vibration becomes increasingly important.
That’s why many customers choose to complement their stroker build with a VAC/ATI Super Damper, providing superior harmonic control and additional protection for high-performance engines.
Built Around Your Goals
No two engine builds are exactly alike.
Our experienced team works with customers to develop the right combination for their application.
Whether you’re building:
- A responsive naturally aspirated street car
- A weekend track machine
- A road-race endurance engine
- A drift car
- A high-horsepower turbocharged build
- A dedicated drag racing engine
We’ll help you choose the rotating assembly that best fits your goals.
BMW Engine Platforms We Support
VAC Motorsports offers stroker kits and rotating assemblies for many of BMW’s most iconic engines, including:
As our engine programs continue to evolve, additional applications are continually being developed.
Why Enthusiasts Choose VAC Motorsports
For decades, engine builders around the world have trusted VAC Motorsports because our recommendations are driven by engineering—not marketing.
We understand that every customer’s goals, budget, and application are different. Sometimes the right answer is a premium Arrow rotating assembly. Other times, it’s a carefully selected combination that delivers outstanding performance while respecting a customer’s budget.
Our commitment has always remained the same:
Recommend the right solution. Build it correctly. Stand behind it.
Speak With a BMW Engine Specialist
Choosing the right stroker kit involves more than selecting parts from a catalog.
Whether you’re planning a naturally aspirated build, designing a turbocharged engine, or simply exploring your options, our experienced team is here to help.
Contact VAC Motorsports today to discuss your project and let us help you build an engine that’s engineered to perform for years to come.