BC5933 – CAN-AM X3 (17-up) Large Radius EN40B BILLET CRANKSHAFT (73.5mm STROKE)

In the relentless pursuit of ultimate power and unbreakable reliability for the CAN-AM X3 platform, conventional forged components often become the limiting factor. The Brian Crower BC5933 Billet Crankshaft represents a paradigm shift in rotating assembly engineering, moving beyond mere replacement into the realm of definitive upgrade. Machined from a solid bar of premium EN40B nickel-chromium-molybdenum steel and featuring a 73.5mm large-radius stroke, this is not a part—it is the foundational core of a transformed engine. Designed for builders who demand absolute precision and catastrophic failure is not an option, the BC5933 converts the X3’s potent triple into a torque-rich, high-RPM powerhouse capable of withstanding the extreme forces of turbocharging, nitrous, and sustained high-load competition use. Every radius, journal, and counterweight is the product of aerospace-level CNC machining and harmonic balancing, setting a new standard for what a UTV crankshaft can be.

Material Science: The EN40B Billet Advantage

Where forged crankshafts are shaped under immense pressure, a billet component is carved from a single, homogenous blank of material. The BC5933 utilizes EN40B steel, a nitriding-grade alloy renowned for its exceptional core strength and superior fatigue resistance. This nickel-chromium-moly composition provides a ductile, tough core that absorbs harmonic stresses and impact forces, while the subsequent gas nitriding process creates an ultra-hard, wear-resistant case on the journal surfaces exceeding 60 Rockwell C. This combination is critical for high-stress applications. The billet manufacturing process allows for grain flow that is uninterrupted and oriented perfectly to handle torsional loads, unlike a forging where grain flow must follow a pre-formed shape. The result is a crankshaft with a significantly higher safety margin against flex, twist, and ultimately, failure under boost or high RPM. For a deep dive into the metallurgical benefits of billet vs. forged rotating assemblies, refer to this technical analysis on Engine Builder Magazine’s resource portal.

Large Radius Design & Harmonic Perfection

The “large radius” fillet where the crank journal meets the cheek is a critical, often overlooked, area of stress concentration. The BC5933 employs generous, CNC-machined radii at these junctions, dramatically reducing the risk of crack initiation compared to the smaller radii found on OEM and many aftermarket forged units. This design spreads the immense bending forces over a greater area, directly contributing to longevity. Furthermore, each BC5933 crankshaft is individually balanced to exacting standards. Brian Crower’s process involves not just bob-weight balancing, but also addressing harmonic vibrations through precise counterweight design and mass optimization. A perfectly balanced rotating assembly minimizes parasitic drag on the engine’s power output, reduces bearing wear, and ensures smoother operation across the entire rev range, which is paramount for the X3’s high-output turbo applications where harmonics can become destructive.

73.5mm Stroke: Engineering for Torque and Displacement

The core of the BC5933’s performance gain lies in its increased stroke. By extending the stroke from the factory specification to 73.5mm, the crankshaft increases the engine’s swept volume when paired with appropriate pistons. A longer stroke inherently increases lever arm and cylinder pressure, producing greater torque, particularly in the low-to-mid RPM range where UTVs operate during technical driving, hill climbs, and acceleration out of corners. This translates to more immediate throttle response and reduced turbo lag. This stroke is engineered to work in harmony with Brian Crower’s matching connecting rods and piston offerings, creating a cohesive, optimized rotating assembly that maintains proper rod angle and piston speed for reliable high-RPM operation.

Precision Engineering & Critical Specifications

Tolerances are everything in a performance crankshaft. The BC5933 is machined to ultra-precise specifications that exceed OEM requirements. Each main and rod journal is micro-finished to a mirror-like surface, promoting optimal oil film retention and minimizing friction and bearing wear. The oil passages are meticulously deburred and polished to ensure unrestricted flow, a non-negotiable feature for an engine that may see sustained high-RPM use. The unit is designed as a direct replacement, maintaining all factory sensor trigger wheels and timing references, ensuring seamless integration with the X3’s OEM ECU or aftermarket engine management systems.

• Unmatched Durability: EN40B billet steel and large-radius design provide ultimate resistance to flex, fatigue, and catastrophic failure.
• Substantial Power Gains: The 73.5mm stroke increases displacement and torque, enhancing low-end response and overall power potential.
• Superior Harmonic Balance: Individually balanced to minimize vibration, reducing bearing loads and improving engine smoothness.
• Optimized for Forced Induction: The core strength and design are specifically intended to handle the increased cylinder pressures from turbocharging or nitrous oxide.
• Precision Fitment: CNC-machined to exacting tolerances for a perfect drop-in fit, maintaining all OEM timing and sensor functions.
• Foundational Upgrade: Enables higher, safer RPM limits and forms the basis for extreme engine builds where reliability is as important as power.

Technical Specifications Table

Vehicle Fitment

Primary Application: This Brian Crower BC5933 Large Radius Billet Crankshaft is engineered specifically as a direct replacement and performance upgrade for the following vehicle:

• CAN-AM MAVERICK X3 (All Models) – 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 model years.
  • Includes X3 DS Turbo, X3 DS Turbo R, X3 MAX Turbo, X3 MAX Turbo R, X3 RC Turbo, X3 RC Turbo R, and all corresponding X RS, X MR, and Sport models equipped with the 900cc (900 ACE) turbocharged 3-cylinder engine.
  • Note: Installation requires compatible pistons designed for the 73.5mm stroke and professional engine assembly. It is a core component for a built engine, not a standalone bolt-on item.

The Definitive Foundation for an X3 Powerplant

The Brian Crower BC5933 is the unambiguous choice for the serious CAN-AM X3 builder. It transcends the concept of a replacement part, serving instead as the engineered-from-zero foundation for a formidable, reliable powerplant. By addressing the weakest link in the high-performance chain with superior metallurgy, intelligent large-radius design, and an optimized stroke, it unlocks the true potential of the X3 engine architecture. Whether the goal is a dominant race vehicle, an unstoppable dune machine, or simply the most durable trail rig possible, it begins with the rotating assembly’s heart. The BC5933 Billet Crankshaft provides the absolute confidence that the bottom end is not just sufficient, but exceptional—a component built not just to meet the demand, but to redefine the limits of the platform.