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Brand: C.OEFT
OE numbers: 12614464
Product Name: Camshaft Adjuster
Compatible model:12626164 12672485
Product status: New
Number of teeth on the product: 40
Product weight: 0.9704KG
Packaging size: 17*17*8.5 cm
Product packaging: Natural Packaging
Car Series: for Buick 3.0
Car Type: American
The Buick 3.0 V6 engine adopts a "V-type layout + dual exhaust manifolds" design. During the exhaust stroke, exhaust gas discharge from cylinders on both sides is prone to airflow interference—especially at high speeds, which easily increases exhaust backpressure and residual exhaust gas volume. With an independent and wider phase adjustment range (5-8° more than intake-side adjusters), this exhaust adjuster dynamically delays/advances the exhaust valve closing timing based on the exhaust rhythm of cylinders on both sides:
·At high speeds (e.g., highway cruising, rapid acceleration): It delays exhaust valve closing to extend the exhaust stroke, alleviating backpressure caused by airflow superposition in dual manifolds, reducing residual exhaust gas in cylinders, and freeing up more space for the intake stroke. This avoids "dilution of fresh air-fuel mixture by exhaust gas"—a core requirement that VVT components for small-displacement (e.g., 2.0T) engines with single exhaust layouts do not need to address.
·At low speeds and low loads (e.g., idling, low-speed traffic following): It advances exhaust valve closing to shorten the overlap time between exhaust and intake valves, preventing high-temperature exhaust gas in the exhaust manifold from flowing back into the intake manifold. This avoids the backflow risk of V6 engines (caused by "longer airways in V-type layouts"), stabilizes the air-fuel mixture concentration in cylinders, and suppresses idle vibration. This regulation logic places more emphasis on "exhaust backflow prevention" compared to VVT adjusters for GM 2.0T engines.
2. In-Depth Synergy with V6 Engine Aftertreatment Systems: Optimizing Emission Purification Efficiency
The three-way catalytic converter of the Buick 3.0 engine adopts a "dual-carrier parallel" design (corresponding to dual exhaust manifolds), which has higher requirements for the stability of exhaust temperature and flow rate. By precisely controlling the exhaust valve opening duration, this exhaust adjuster matches the preheating and operating needs of the dual catalytic converters:
·Cold start phase: It shortens the exhaust valve opening time to increase exhaust flow velocity, rapidly heating the dual catalytic converter carriers (V6 dual catalytic converters need to reach the operating temperature of over 300℃ faster than small-displacement engines), reducing HC and CO emissions during the initial cold start stage.
·Normal operation phase: It dynamically adjusts the exhaust valve opening rhythm according to engine load, avoiding "instantaneous flow interruption" or "excessive impact" on the catalytic converters caused by large fluctuations in exhaust flow velocity. This ensures the dual carriers always remain in the high-efficiency purification range—this function is a "dual exhaust adaptability" design not available in VVT components for GM small-displacement engines (with single catalytic converters).
The exhaust camshaft of V6 engines drives exhaust valves of cylinders on both sides, and needs to overcome higher exhaust backpressure when exhaust valves open—its instantaneous load is over 30% higher than that of 4-cylinder/2-cylinder engines. This adjuster adopts a reinforced alloy steel housing + dual ball bearing structure (ordinary VVT adjusters mostly use single bearings):
·The housing has a tensile strength of 800MPa (higher than 650MPa of GM 2.0T adjusters), which can withstand high-torque impacts from the V6 exhaust camshaft and prevent phase deviation caused by housing deformation.
·The dual ball bearings reduce friction resistance during camshaft rotation, especially adapting to the long-term load of V6 engines during "continuous high-speed operation" (e.g., highway cruising). Its service life is extended by over 20% compared to ordinary single-bearing adjusters—this is an exclusive durability design for the "high-load exhaust camshaft" of V6 engines.
2. Factory-Calibrated V6-Exclusive Oil Pressure Control Logic: No Post-Installation Adaptation Required
General Motors has matched this adjuster with an ECU control program exclusive to V6 engines, with an oil pressure adjustment accuracy of ±0.2bar (higher than ±0.5bar of 2.0T adjusters):
·It can dynamically adjust the oil supply volume according to the exhaust rhythm of different cylinders in the V6 engine (the ignition order of V-type layout cylinders is 1-2-3-4-5-6, with more complex staggered exhaust strokes), avoiding adjuster response delays caused by "differences in cylinder exhaust timing."
·Unlike GM cross-displacement adaptive VVT components, no ECU re-calibration is required after installation. Direct replacement can restore the original factory power parameters of the Buick 3.0 V6 engine (e.g., output range of 230 horsepower / 290N·m), avoiding "false power claims or increased fuel consumption caused by improper adaptation of universal adjusters." This is an "original factory exclusive adaptability" that "cross-displacement universal VVT components" cannot match.
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