Description
Engineered by Schaeffler Group, the INA Engine VVT Camshaft Assembly with Phaser combines a high-precision assembled camshaft with an integrated Variable Valve Timing (VVT) dynamic phaser into a single, factory-synchronized unit. Operating as the core control element in modern overhead camshaft (OHC) valvetrains, this assembly dynamically adjusts camshaft angle relative to the crankshaft, optimizing valve timing in real time based on engine speed and load conditions. Designed to eliminate valve actuation delay, reduce toxic emissions, and restore engine responsiveness, INA utilizes advanced hydraulic/electromechanical phase technology paired with micro-alloyed steel construction. The precision-machined lobe contours and high-response VVT phaser provide smooth operation under extreme high-RPM and high-temperature environments. This pre-assembled, OE-spec system is an essential replacement choice for professional machine shops, engine reconditioners, and automotive parts distributors looking to eliminate timing code errors and improve overall powertrain performance.
Technical Parameters
| Category | Specifications & Technical Details |
| Integrated Hydraulic VVT Phaser & Fast Response Dynamic Adjustment | This assembly directly integrates INA’s core high-response hydraulic VVT phaser. Driven by an engine oil pressure-controlled solenoid valve, it actuates the internal vane mechanism to achieve continuous stepless adjustment of camshaft angle (adjustment range typically up to 40°–60° crankshaft angle). This allows the engine to maintain high torque output at low RPM while greatly increasing power at high RPM. |
| Assembled Lightweight Hollow Shaft & Reduced Rotational Mass | The shaft body utilizes a built-up shaft shrink-fit manufacturing process combining high-strength seamless steel tube with forged / hardened cam lobes. Compared to traditional solid cast camshafts, the hollow structure reduces overall weight and rotational inertia by 30%–40%, greatly reducing the driving load and response lag of the VVT phaser during rapid angle adjustment. |
| Induction-Hardened Cam Lobes with Micron-Level Profile Precision | Cam lobe working surfaces undergo precision induction hardening, achieving hardness of 58–62 HRC. Lobe lift curve tolerances are controlled at micron level, combined with extremely low surface roughness (Ra ≤ 0.1 μm). This effectively prevents surface pitting, spalling, and wear caused by long-term high-frequency friction from rocker arms or hydraulic lifters. |
| Ra ≤ 0.1 μm Super-Finished Journal Polish | Camshaft support journals undergo super-finishing and polishing, ensuring ultimate cylindricity and surface finish. This process enables the journals to rapidly establish a stable and durable hydrodynamic lubricating oil film even under extremely low oil pressure, effectively reducing friction power loss and preventing bearing seat seizure or scoring. |
| Precision Pre-aligned Target Wheel & Integrated Lock Pin Mechanism | The phaser internally integrates a high-strength cold-start locking pin, which locks the phaser at the safe initial phase before oil pressure is established, preventing gear rattle noise during engine start-up. The shaft end is simultaneously precisely positioned with a signal target wheel, ensuring continuous accurate camshaft position signal output to the ECU. |
Applicable Car Brands & Models
Common warning signs include:
Engine Rattling or Knocking Noise on Cold Start: A loud chattering noise lasting 2-5 seconds during start-up, usually caused by a worn internal lock pin or loss of oil pressure inside the VVT phaser.
Check Engine Light (CEL) & Diagnostic Error Codes: Stored timing fault codes such as P0011, P0012, P0014, P0016, or P0340 indicating camshaft position timing over-advanced, over-retarded, or misaligned.
Rough Idling, Hesitation & Poor Fuel Economy: Unstable engine idle and sluggish throttle response caused by the camshaft phaser getting stuck in a fixed position.
While some engines allow independent phaser servicing, replacing the complete INA Camshaft Assembly with integrated Phaser is highly recommended if the assembly has accumulated high mileage. Worn camshaft journals or scored lobes can cause oil pressure leaks, which prevent a new VVT phaser from operating correctly, leading to recurring repair failures.
The integrated VVT phaser relies on clean, high-pressure engine oil flowing through micro-passages to continuously actuate the timing vanes. Contaminated oil or sludge can clog the hydraulic control valves, wear out internal seals, or cause the phaser’s lock pin to stick. Always perform an oil and filter change with recommended oil viscosity during installation.
Every INA VVT Camshaft Assembly with Phaser is coated with anti-corrosion VCI protective oil, vacuum-sealed in heavy-duty moisture-proof plastic packaging, and supported by customized foam inserts inside an OEM-grade protective box. B2B minimum order quantities (MOQ) typically start at 5 to 10 units per part number, with palletized shipping options for bulk overseas orders.
