The HKS Lightweight Forged Crankshaft for Nissan RB26DETT (Part No. 23006-AN003) is a high-end internal engine component designed for serious RB builds, typically used in 2.8L stroker conversions (HKS STEP kits).
Here’s a clear breakdown of what it is and why it matters:
🔧 What it is
- Brand: HKS
- Part number: 23006-AN003
- Engine: Nissan RB26DETT (Skyline GT-R R32/R33/R34)
- Type: Lightweight forged crankshaft (fully counterweighted)
- Use case: High-performance / racing / forged rebuilds
⚙️ Key technical features
From HKS STEP 2 kit data and product specs:
- Forged steel construction → much stronger than OEM cast crank
- Lightweight design → improves throttle response and acceleration
- Fully counterweighted → reduces vibration at high RPM
- Stroke: ~77.7 mm (used for 2.8L RB26 builds)
- Surface treatment (Tufftride / nitriding) → improves wear resistance and fatigue strength
- Designed to handle high RPM + high boost applications
🚗 Why enthusiasts use it
This crank is not a “bolt-on power mod”—it’s part of a full engine rebuild/stroker setup.
It is typically paired with:
- Forged pistons
- Forged H-beam rods
- Balanced rotating assembly
- Aftermarket ECU tuning
Together, it supports:
- Higher displacement (2.8L vs 2.6L stock)
- Better torque across the rev range
- Stronger reliability under high boost (track / drag / time attack use)
💥 What makes it special vs OEM RB26 crank
|
Feature |
HKS forged crank |
OEM RB26 crank |
|
Material |
Forged racing steel |
Cast steel |
|
Strength limit |
Very high (built motors) |
Moderate-high |
|
Weight |
Lighter |
Heavier |
|
Balance |
Fully counterweighted |
Less optimized |
|
Use case |
Race / stroker builds |
Stock / mild tuning |
⚠️ Important reality check
- This crank alone does NOT increase power
- Requires full engine build + machining
- Very expensive and usually used in builds targeting 500–1000+ hp setups
- Needs precise balancing or it can damage the engine
💡 Bottom line
The HKS 23006-AN003 is basically:
A motorsport-grade crankshaft used to turn an RB26DETT into a fully built, high-RPM 2.8L performance engine.
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