| Quantity: | |
|---|---|
| Category | Parameter | Value |
| Chemical Composition | Steel Grade | SAE 4340 (medium-carbon, low‑alloy ultra‑high strength steel) |
| Carbon (C) | ~0.38–0.43 | |
| Nickel (Ni) | ~1.65–2.00 % | |
| Chromium (Cr) | ~0.70–0.90 % | |
| Manganese (Mn) | ~0.65–0.90 % | |
| Molybdenum (Mo) | ~0.20–0.30 % | |
| Mechanical Properties | Tensile Strength (ultimate) | ~860–1980 MPa depending on heat treatment |
| Yield Strength | ~740–1860 MPa depending on treatment | |
| Ductility (elongation) | ~11–23 % | |
| Hardness (HRC) | 24 to 53 HRC achievable through tailored heat treatment | |
| Heat Treatment | Typical Process | Quenching & tempering (to reach high fatigue and impact resistance) |
| Surface Enhancements | Shot‑peening and optional nitriding for fatigue life (as in Callies/Cosworth) | |
| Forging | Forging Method | Closed‑die forging using premium Ti‑clean 4340 for consistency and strength (as used by Callies and OEM equivalent) |
| Surface Finish | Shot‑peened and fully machined surfaces to tight tolerances (e.g. 4 Ra or better) | |
| Dimensional Tolerances | Bore tolerance ±0.0001″; weight balanced to ±1 g per rod end (K1 rods) |
Nitrided Surface Hardness
A specially nitrided compound and diffusion layer delivers exceptional surface hardness up to around 1000 HV, dramatically reducing wear on big-end bearings and journals
Exceptional Wear & Abrasion Resistance
The formation of iron‑nitride and nitrogen‑rich diffusion zones delivers a thick, wear‑resistant case that extends component life under high contact stress
Enhanced Fatigue Strength
Nitriding introduces compressive residual stress beneath the surface and refines the microstructure to substantially improve fatigue resistance in cyclic high‑RPM use
Core Toughness Retained
Low‑temperature nitriding preserves the forged steel’s core toughness while hardening the surface, maintaining impact resistance and structural integrity
Precision Surface Finish & Corrosion Protection
The nitrided layer delivers a uniform, polished finish (≤ 16 Ra) combined with post-oxidized film to resist pitting and friction-induced damage
High‑Boost Turbocharged Builds
Engineered to withstand sustained high boost pressures and extreme RPM loads commonly found in turbocharged and track‑tuned 4G63 engines
High Horsepower Racing Setups
Ideal for street, drag, or circuit builds pushing beyond 500–600 hp, where fatigue resistance and joint strength are critical
OEM Replacement & Street Performance
Direct‑fit upgrade for Mitsubishi 4G61/4G63/4G64 series engines in Evo, Galant VR‑4, Eclipse, and other variants
Long‑Stroke or Stroker Applications
Compatible with longer rod configurations (150–162 mm) for custom stroker builds improving torque and displacement in Evo platform engines
A: It is made from ultra-high-strength 4340 forged steel, offering superior durability and fatigue resistance.
A: Yes, it is designed for direct fitment in Mitsubishi 4G63 engines, including high-boost turbo builds.
A: Absolutely. It supports up to 600+ horsepower, making it ideal for racing and performance setups.
A: Yes, it features ARP 2000 or optional ARP 625+ bolts for maximum clamping strength
| Category | Parameter | Value |
| Chemical Composition | Steel Grade | SAE 4340 (medium-carbon, low‑alloy ultra‑high strength steel) |
| Carbon (C) | ~0.38–0.43 | |
| Nickel (Ni) | ~1.65–2.00 % | |
| Chromium (Cr) | ~0.70–0.90 % | |
| Manganese (Mn) | ~0.65–0.90 % | |
| Molybdenum (Mo) | ~0.20–0.30 % | |
| Mechanical Properties | Tensile Strength (ultimate) | ~860–1980 MPa depending on heat treatment |
| Yield Strength | ~740–1860 MPa depending on treatment | |
| Ductility (elongation) | ~11–23 % | |
| Hardness (HRC) | 24 to 53 HRC achievable through tailored heat treatment | |
| Heat Treatment | Typical Process | Quenching & tempering (to reach high fatigue and impact resistance) |
| Surface Enhancements | Shot‑peening and optional nitriding for fatigue life (as in Callies/Cosworth) | |
| Forging | Forging Method | Closed‑die forging using premium Ti‑clean 4340 for consistency and strength (as used by Callies and OEM equivalent) |
| Surface Finish | Shot‑peened and fully machined surfaces to tight tolerances (e.g. 4 Ra or better) | |
| Dimensional Tolerances | Bore tolerance ±0.0001″; weight balanced to ±1 g per rod end (K1 rods) |
Nitrided Surface Hardness
A specially nitrided compound and diffusion layer delivers exceptional surface hardness up to around 1000 HV, dramatically reducing wear on big-end bearings and journals
Exceptional Wear & Abrasion Resistance
The formation of iron‑nitride and nitrogen‑rich diffusion zones delivers a thick, wear‑resistant case that extends component life under high contact stress
Enhanced Fatigue Strength
Nitriding introduces compressive residual stress beneath the surface and refines the microstructure to substantially improve fatigue resistance in cyclic high‑RPM use
Core Toughness Retained
Low‑temperature nitriding preserves the forged steel’s core toughness while hardening the surface, maintaining impact resistance and structural integrity
Precision Surface Finish & Corrosion Protection
The nitrided layer delivers a uniform, polished finish (≤ 16 Ra) combined with post-oxidized film to resist pitting and friction-induced damage
High‑Boost Turbocharged Builds
Engineered to withstand sustained high boost pressures and extreme RPM loads commonly found in turbocharged and track‑tuned 4G63 engines
High Horsepower Racing Setups
Ideal for street, drag, or circuit builds pushing beyond 500–600 hp, where fatigue resistance and joint strength are critical
OEM Replacement & Street Performance
Direct‑fit upgrade for Mitsubishi 4G61/4G63/4G64 series engines in Evo, Galant VR‑4, Eclipse, and other variants
Long‑Stroke or Stroker Applications
Compatible with longer rod configurations (150–162 mm) for custom stroker builds improving torque and displacement in Evo platform engines
A: It is made from ultra-high-strength 4340 forged steel, offering superior durability and fatigue resistance.
A: Yes, it is designed for direct fitment in Mitsubishi 4G63 engines, including high-boost turbo builds.
A: Absolutely. It supports up to 600+ horsepower, making it ideal for racing and performance setups.
A: Yes, it features ARP 2000 or optional ARP 625+ bolts for maximum clamping strength
