Choosing the Right Crankshaft
The crankshaft is one of the most critical components in any engine rebuild. Choosing the right one protects the whole rotating assembly and determines how long your build will last. This guide summarizes the main points to check when sourcing a crankshaft for gasoline and diesel engines.
Forged or Cast
Forged crankshafts are stronger and better suited to high-performance or high-load applications, while cast units can be adequate for standard daily-driving engines. For turbocharged and heavy-duty diesel builds, forged cranks are generally the safer choice.
Check the Specifications
| Specification | What to Verify |
|---|---|
| Journal diameter | Matches OE size or intended oversize |
| Stroke | Correct for the target engine code |
| Material | Forged 4340 or OE-equivalent alloy |
| Balancing | Static or dynamic, as required |
Match the Engine Code
Always confirm the crankshaft against the exact engine code, not only the vehicle model. Popular families include Volkswagen and Audi 2.0T and 3.0TDI, BMW N20, N47, N57 and N63, Mercedes-Benz OM651 and M274, Toyota 1GR, 1KD and 2UZ, and Hyundai and Kia D4HB. Tiny differences between codes can affect fitment.
Tolerances and Finish
- Verify main and rod journal diameters within specification
- Check surface finish on journals for bearing compatibility
- Confirm thrust surfaces are square and flat
Balancing and Assembly
A crankshaft should be balanced together with its connecting rods and pistons for smooth running. During assembly, use correct torque sequences, clean oil passages and quality bearings to protect the new crank from the first start.
How We Can Help
- Accurate OE cross-reference by engine code
- Forged and standard crankshafts in stock
- Technical support and a 12-month warranty on core components
Get Started
Send us your engine code and target application and we will recommend the right crankshaft and bearings. Contact us for wholesale details and pricing, and let our team support your rebuild from selection to delivery.
Common Mistakes to Avoid
- Ordering by vehicle model instead of engine code
- Reusing worn bearings with a new crankshaft
- Skipping balancing on high-performance builds
- Ignoring oil passage cleaning during assembly
Our Crankshaft Range
We supply forged and standard crankshafts for a wide range of engines, including the VW and Audi 2.0T and 3.0TDI, BMW N20, N47, N57 and N63, Mercedes-Benz OM651 and M274, Toyota 1GR, 1KD, 2UZ and 2AZ, and Hyundai and Kia D4HB. Matching bearings and connecting rods are available to complete your build.
Order With Confidence
Send us your engine code and target application today and we will recommend the right crankshaft and bearings. With accurate references, stable quality and a 12-month warranty on core components, your next rebuild is in safe hands.
