Forged Crankshafts

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🔧 Forged & Billet Crankshafts — Performance & Reliability

The crankshaft is the mechanical heart of the engine: it transforms the reciprocating motion of the pistons into rotation and transmits power to the transmission. For demanding preparations, forged or billet -machined crankshafts are an advantageous replacement for OEM parts and guarantee much greater robustness and longevity.

What is a forged crankshaft?

A forged crankshaft is made from high-quality steel (e.g., EN40B, 4340) and then worked by forging and CNC machining. This process improves the structure of the metal, increases its fatigue resistance, and reduces the risk of breakage under high stress.

🚀 Advantages of forged/billet crankshafts

🛡️ Enhanced reliability : withstand loads and torques much higher than original parts.
⏳ Durability : Ideal for track, drift, drag or street project use.
⚡ Performance : possibility of stroker kits (increase in stroke) for more torque and displacement.
🎯 Machining precision : tight tolerances, optimal balancing to limit vibrations and wear.
🔧 Custom Fit : Machinable to fit specific pistons, connecting rods and configurations.

🌍 Popular Brands & References

We offer and recommend crankshafts from recognized market players:

ZRP (Zorbas Racing Parts) — specialty: EN40B billet crankshafts for European engines (Audi RS3, TTRS, etc.).
Callies Performance — American leader, renowned for its forged crankshafts for drag racing and high-power V8s.
Brian Crower (BC) — reference for stroker kits and crankshafts for Japanese blocks (Honda, Toyota, Nissan).
K1 Technologies — excellent value for money, wide range of forged crankshafts.
Manley Performance — a must-have in racing, especially on turbo and high-power engines.

⚙️ For which applications?

Forged/billet crankshafts are intended for the following projects:

Stage 3/4/5 preparations (big turbo, high pressure)
Stroker kits to increase displacement and torque
Competition uses: track, drag, drift
High-performance street projects seeking to make the engine base more reliable

🔍 Buying & installation advice

Always check engine compatibility (engine code, piston and connecting rods dimensions).
Plan for dynamic balancing of the rotating assembly after installation (pistons, connecting rods , axles, segments).
Use suitable connecting rods and bearing and check oil clearances and assembly tolerances.
For stroker kits, check crankcase clearance and compatibility with block geometry.

❓ Quick FAQ

Is forged crankshaft better than OEM?

Yes — in terms of fatigue resistance, increased power tolerance and longevity under high-stress conditions.

Should the crankshaft be balanced?

Yes. Dynamic balancing of the rotating assembly is strongly recommended. Some manufacturers (e.g., ZRP ) sell their crankshafts unbalanced —balancing should be performed as per the final assembly.

Which brand to choose?

The choice depends on the application: ZRP or Brian Crower for European/Asian engines in high-performance preparation, Callies or Manley for American blocks and extreme use. We can advise according to your project.

📝 Conclusion

Investing in a forged or billet crankshaft is one of the best choices for anyone looking to increase power or improve the reliability of a tuned engine. Whether you're aiming for track, drift, drag, or a high-performance street project, crankshafts ZRP , Callies, Brian Crower, and other leading brands guarantee strength, precision, and long-term peace of mind.

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FAQ: The Most Frequently Asked Questions

How do I track my package?

As soon as the shipment is made, you will receive an email with a tracking link. You can also find this link in your customer account, under "My Orders." Delivery is tracked via Chronopost, Colissimo, DPD, or UPS.

How to contact Customer Service?

You can contact our customer service by email at https://strperformance.com/en/ or by phone at +33 01 34 67 70. We are available Monday to Friday, from 9:00 a.m. to 12:00 p.m. and from 2:00 p.m. to 5:00 p.m. Customer service is closed between 12:00 p.m. and 2:00 p.m. Response guaranteed within 24 to 48 hours (excluding weekends and public holidays).

Which countries do you deliver to?

STR Performance ships your orders all over the world: mainland France, French overseas departments and territories, Europe (Belgium, Switzerland, Spain, Germany, etc.) as well as internationally (Canada, Maghreb, overseas, etc.). Our shipping partners include Chronopost, Colissimo, DPD and UPS, depending on the country, weight and size of the package. Shipping costs are automatically calculated at the checkout stage based on your address. Each shipment is tracked online and secure. We deliver to your home, collection point or business depending on the options available in your area.

What are the shipping times?

Shipping times at STR Performance depend on product availability and delivery destination. ✅ Products in stock : dispatch within 24 to 48 working hours after payment validation (excluding weekends and public holidays). 🔄 Products being restocked or personalized : an additional delay may apply (specified on the product sheet or communicated by our customer service). Average delivery times after dispatch : 🇫🇷 Metropolitan France : 1 to 3 working days via Chronopost, Colissimo or DPD 🇪🇺 Europe (Belgium, Luxembourg, Germany, Spain, etc.) : 3 to 7 working days 🌍 DOM-TOM, Canada, Maghreb, and rest of the world : 5 to 12 working days depending on the area Each order benefits from online tracking : you will receive an email with a tracking number as soon as your package is picked up by the carrier. Important : Orders placed after 12 p.m. are generally processed the following business day. Delivery times may be longer during busy periods (sales, promotions, holidays, etc.).

How much are the shipping costs?

Shipping costs are calculated automatically at the checkout stage, based on the weight, volume of your package and your delivery area. We offer several carriers (Chronopost, Colissimo, DPD, UPS) with rates adapted for France, Europe, the French overseas departments and territories and internationally. The exact cost is displayed before payment, once your address has been entered.