1941346301@qq.com
19924579082
product Overview:
The 3801668 is an upgraded STC big camshaft for Cummins NT855 & NTA855 mechanical engines. Built for steady medium-load operation and fully matched with STC fuel systems, it features great durability, high fuel efficiency and cost-effectiveness, ideal for gensets, construction machinery, marine and industrial equipment.
Key Features:
✅ STC-Optimized Profile – Built for Cummins STC systems, boosts low-end torque and throttle response
✅ Increased Valve Lift – 8% higher lift than standard for improved performance
✅ Fuel-Efficient Design – Precision profile cuts consumption by 3–5%
✅ Forged Steel Construction – Induction-hardened lobes/journals (HRC 58–62) for superior wear resistance
✅ Big Cam Spec Journals – 63.5mm diameter for maximum rigidity under heavy loads
✅ Extended Service Life – 25–30% longer lifespan than standard camshafts
Core Specifications:
| Parameter | Details |
|---|---|
| Part Number | 3801668 |
| Fit Engine | Cummins NT855 / NTA855 (Big Cam II/III/IV, STC-equipped) |
| Fuel System | STC (Step Timing Control) Mechanical Pump |
| Material | High-strength forged steel |
| Hardness | HRC 58–62 (induction-hardened lobes/journals) |
| Hardened Layer Depth | ≥ 2mm |
| Valve Lift | Intake: 8.13mm / Exhaust: 7.87mm |
| Journal Diameter | 63.5mm (Big Cam standard) |
| Length | ~1040mm |
| Applications | Generator sets (250–350kW), construction machinery, marine equipment |
Why Choose Us?
✅ 100% authentic CCEC original parts with OEM quality
✅ Favorable wholesale pricing & bulk order discounts
✅ Ample stock, global delivery in 3-15 days
✅ Professional certified technical guidance
✅ Rigorous pre-delivery quality inspection
Name: Aandy
Mobile：
Tel：19924579082
Email：1941346301@qq.com
Add：5F, Block 4, Next Industrial Park, 136 Zhongkang Road, Futian Dist, Shenzhen
