Busted Knuckle Revolutionizes Intake Development with CreatBot

4 min read
Complex Internal Structures of Racing Components

From weeks to 48 hours, boosting performance and cutting costs

Executive Summary

Faced with intense off road racing competition and tight modification windows, professional aftermarket brand Busted Knuckle Offroad turned to the CreatBot D600 Pro2 HS industrial 3D printer.

By using PA CF material to 3D print high performance intake manifolds in a single piece, they reduced the development cycle from 3–4 weeks to just 48 hours, cut single unit costs by over 80%, and validated outstanding performance and reliability in world class competitions, giving drivers a real edge on the track.

Busted Knuckle Offroad Racing Customization

Industry Challenge: Traditional Manufacturing Can’t Keep Up with Racing Agility

For a top tier off road motorcycle brand like Busted Knuckle Offroad, upgrading the engine intake manifold is key to unlocking performance. Yet relying on traditional aluminium CNC machining and welding presents major hurdles:

  • Time consuming: From finalising the design to a testable part, CNC programming, machining, and post processing take 3–4 weeks, too slow for fast paced race preparation.
  • Costly: Small batch, custom parts require expensive tooling, often exceeding $5,000 per intake, limiting the frequency of design iterations.
  • Design limitations: Welded assemblies can accumulate up to ±1.2 mm in tolerance errors, and complex internal structures like optimised airflow channels or integrated dust separators are nearly impossible, restricting performance gains.

Complex Internal Structures of Racing Components

Technical Breakthrough: CreatBot D600 Pro2 HS One Piece 3D Printing Solution

By adopting the CreatBot D600 Pro2 HS, Busted Knuckle Offroad gained clear advantages over traditional methods:

  • Fast turnaround: Full “design print test” loop completed in just 48 hours.
  • Dramatic cost reduction: No expensive tooling, single unit production costs a fraction of traditional methods.
  • Unlimited design freedom: One piece printing eliminates weld errors, allowing complex aerodynamic shapes and integrated functional structures.

Engine Intake Manifold 3D Printing Process

Performance Challenges and Engineering Solutions

Why PA CF 3D Printing Works

The engine intake is the engine’s “lungs,” directly affecting power, efficiency, and reliability. In harsh off road conditions, it must meet these demands:

1. Extreme heat resistance

Withstands 80–120°C continuously, with short peaks above 140°C, without softening or warping.

2. High strength and rigidity

Survives off road vibration and shocks, preventing resonance or interference with other components.

3. Material stability and sealing

Resistant to oils and chemicals, ensuring long term durability. Airtightness is critical for precise ECM control.

4. Optimised internal airflow

Smooth internal walls reduce flow resistance. Aerodynamic shapes ensure fast, stable airflow into cylinders.

5. Lightweight

Reducing both sprung and unsprung mass is key to improving vehicle handling and responsiveness.

Our Solution

Traditional methods were slow and costly. Using CreatBot D600 Pro2 HS and advanced materials, Busted Knuckle Offroad delivered a perfect solution.

How We Made It Happen

1. Material Choice: High Performance PA CF (Carbon Fibre Reinforced Nylon)

  • Heat resistance: HDT up to 140°C, exceeding engine bay requirements.
  • Strength and rigidity: Carbon fibres in nylon matrix enhance stiffness and impact resistance. Achieves 38% weight reduction while maintaining durability.
  • Chemical resistance: Naturally resists oils and chemicals for long term performance.

2. One Piece 3D Printing

  • Sealing and integrity: With a 600 × 600 × 600 mm build volume, the intake is printed in one piece, eliminating weld induced leaks and tolerance errors.
  • Design freedom and airflow: 3D printing enables complex internal channels and aerodynamic shapes, allowing rapid iteration for peak performance.

3. Precision Post Processing

  • Critical flanges are machined for perfect engine and throttle body fit, with high quality seals ensuring airtight connections.

Full Scale 3D Printed Engine Intake Manifold Showcase

Proven Performance: Lab to World Class Races

Phase 1: Extreme Lab Testing (Q3 2023)

  • Ran 50 hours at 85°C / 95% humidity with zero deformation.
  • Lightweight advantage: 38% lighter than aluminium (620 g → 385 g).

Phase 2: Global Race Validation (2024 Season)

  • King of the Motos: 15% less high altitude power loss, achieved 2nd place.
  • Sea to Sky: Air filter replacement intervals extended 300%, completed the race smoothly.

Real World Applications of the Engine Intake Manifold

Economic Impact: Redefining Cost Structures

Traditional CNC Program

Around $5,200 (including $5,000 tooling amortised over small batch production).

3D Printing Solution

Total: $470

  • Material + energy: $320
  • Post processing: $150

Over 90% savings, enabling more design testing. It also allows development of specialised parts for additional models.

Conclusion and Outlook

Busted Knuckle Offroad’s success demonstrates that additive manufacturing is a game changer for high performance, low volume, custom industrial applications.

The CreatBot D600 Pro2 HS not only tackled complex engineering challenges but also streamlined development workflows, unlocking a decisive competitive advantage.

Looking forward, the team is set to expand 3D printing to engine mounts, lightweight structural components, and other mission critical parts, continuing to push the boundaries of off road motorcycle performance and innovation.