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Brand: C.OEFT
OE numbers: 12588151
EAProduct Name:Central valve
Compatible model: /
Product status:New
Product weight:0.1513KG
Packaging size: 15*7.5*6 cm
Product packaging:natural Packaging
Car Series: American
Car Type: for GMC Chevrolet
1.Precise Control of Oil Pressure and Flow Direction in the VVT System
It receives real-time electrical signals from the Engine Control Unit (ECU) and, through high-frequency reciprocating displacement of the internal central spool (response frequency up to 50Hz), accurately controls the pressure (adjustment range: 0.8-13bar) and flow path of high-pressure engine oil. Based on the engine’s real-time operating conditions (speed, load, and cooling water temperature), it precisely distributes oil to the "timing advance chamber" or "timing retard chamber" of the camshaft phaser, providing stable and controllable hydraulic power for camshaft phase adjustment. Ensuring a phase adjustment accuracy error of ≤±0.8°, it serves as the "hydraulic core" for the VVT system to achieve dynamic timing changes.
2.Dynamic Optimization of Camshaft Phase to Adapt to GM Models’ Power Characteristics
By regulating oil pressure to drive the rotation of the rotor inside the camshaft phaser, it changes the relative angle between the camshaft and crankshaft, thereby dynamically adjusting the intake valve opening/closing timing and valve overlap angle to match the dual usage scenarios of GMC and Chevrolet models ("daily commuting + high-speed cruising"):
·Low-speed and low-load conditions (urban congestion/start-up): Advances the intake valve opening time and increases the valve overlap angle to improve cylinder scavenging efficiency, boosting the engine’s low-speed torque by 7%-9% (e.g., for the Chevrolet Equinox 1.5T, torque at 1500rpm increases by approximately 25N·m), and optimizing power response during start-up lag and low-speed following;
·High-speed and high-load conditions (high-speed overtaking/full load): Retards the intake valve closing time and extends the intake stroke. Combined with the "variable-displacement oil pump" design of GM engines, this increases maximum power output (power increased by approximately 4%-6%) to meet power demands for high-speed overtaking or full-load driving, avoiding high-speed power attenuation.
1.GM OE-Level Adaptation with High Compatibility Covering Multiple Models
Manufactured in strict accordance with GM’s original equipment (OE) technical standards, the valve body interface size, spool stroke, and electrical signal connector specifications are fully matched to the cylinder head oil passages and ECU signal system of a variety of mainstream GMC and Chevrolet models (e.g., Chevrolet Malibu XL 2.0T, Equinox RS, and certain GMC Sierra 1500 models). It can directly replace original parts without additional modification or adjustment. Compatible with multiple GM Ecotec engine series (LTG, LSY, LFX, etc.), its compatibility far exceeds that of ordinary aftermarket parts "adapted for a single model," reducing the parts inventory pressure for repair businesses. The installation success rate is 100%, avoiding issues such as oil leakage (aftermarket part failure rate of approximately 14%), abnormal pressure, and timing disorder caused by poor adaptation.
2.Design for Severe Operating Conditions with Service Life Far Exceeding Aftermarket Parts
Targeting the complex operating environments that GMC and Chevrolet models may face (e.g., high-temperature exposure, low-temperature cold, and high-load towing), it features enhanced design in materials and structure:
·Valve Body Material: Made of high-strength die-cast aluminum alloy specified by GM (tensile strength ≥290MPa), with dual anti-rust treatment of "chromate passivation + epoxy resin coating," achieving salt spray corrosion resistance of 800 hours (vs. approximately 300 hours for aftermarket parts). It can withstand oil pressure above 13bar and extreme temperatures from -45℃ to 170℃ inside the engine;
·Spool and Seals: The spool is made of stainless steel (hardness ≥HV520) with excellent wear resistance; the seals are made of a composite material of oil-resistant and high-temperature-resistant fluororubber and nitrile rubber (temperature resistance range: -45℃~200℃), with strong resistance to oil sludge adhesion. It can effectively resist erosion from oil oxidation products and additives, avoiding pressure loss caused by seal failure.
Tests show that its service life can reach 90,000-110,000 kilometers under normal operating conditions, far exceeding the 40,000-60,000 kilometers of ordinary aftermarket parts, reducing the frequency of subsequent replacements and maintenance costs.
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