Frequently Asked Questions (FAQs)
1. What is the strongest crankshaft?
The strongest crankshaft for high-performance applications is the billet 4340 steel crankshaft. These crankshafts are carved from a solid chunk of steel and are known for their exceptional strength and durability.
A performance crankshaft improves durability and can handle higher loads and RPMs without twisting, cracking, or failing. It is also finished to a higher standard of accuracy and precision compared to ordinary crankshafts.
3. What is the best type of crankshaft?
Billet crankshafts are considered the top-end high-performance crankshafts. They are made from a solid chunk of high-grade steel bar, typically 4340 material, and are machined through a series of processes to create the final crankshaft.
4. How much HP can a crankshaft handle?
The horsepower limit for a crankshaft depends on its type. Cast cranks can handle around 500 hp and a maximum of 6,500 rpm for small-block engines. Big-block engines with cast cranks can handle up to 650 hp. Forged cranks, specifically 4340 steel, are the standard for higher horsepower applications.
5. Which is better forged or billet crankshaft?
Both forged and billet crankshafts have their advantages. Forged crankshafts have an interwoven grain structure, providing superior tensile strength and improvements in elongation. Billet crankshafts, on the other hand, are a better option for custom one-off cranks since they don't require expensive tooling equipment.
6. Does changing crankshaft increase horsepower?
Increasing an engine's displacement with a longer stroke crankshaft can increase torque output and, in most cases, horsepower as well. Turbocharged applications may also benefit from improved boost response with a longer stroke crankshaft.
7. What is the benefit of a bigger crankshaft?
A bigger crankshaft can provide more low-end torque by increasing rotating mass. This can make the engine feel more responsive at lower RPMs. Additionally, a longer crankshaft can help reduce engine vibration and create a smoother ride for the operator.
8. What's better forged or cast crankshaft?
Forged crankshafts offer superior tensile strength and improvements in elongation compared to cast crankshafts. Once heat treated, forged crankshafts can have tensile strength ratings as high as 125,000 psi, while cast crankshafts typically start near 60,000 psi.
