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Brand: C.OEFT
OE numbers: 28362673
Product Name: Camshaft Adjuster
Compatible model: 12655753
Product status: New
Number of teeth on the product: 54
Product weight: 0.63KG
Packaging size: 13.5*13.5*8CM
Product packaging: Natural Packaging
Car Series: for Buick Velan 1.4
Car Type: American
As the "power connection hub" between the engine crankshaft and camshaft, this sprocket accurately meshes with the timing chain to stably transmit the rotational power of the crankshaft to the camshaft, and strictly controls the speed ratio between the two (camshaft speed is 1/2 of the crankshaft speed):
·It ensures the camshaft drives the valve train (tappets, rockers, etc.) at a preset rhythm, allowing the intake and exhaust valves to open and close precisely at specific moments during each piston stroke (intake, compression, power, exhaust). For example, the intake valve opens when the piston moves downward during the intake stroke and closes completely before the compression stroke starts. This prevents collision between valves and pistons and guarantees the basic operating order of the engine.
·Adapted to the "high-speed commuting" characteristic of the Buick 1.4 engine (common speed range: 2,000-4,000 rpm), it reduces speed fluctuations during power transmission and avoids issues such as decreased intake efficiency or incomplete exhaust caused by timing deviation.
2. Collaborate with the Valve Train to Optimize Intake Efficiency of Small-Displacement Engines
In response to the "small-displacement, high compression ratio" design of the Buick 1.4 engine (compression ratio approximately 10.5:1), this sprocket helps improve intake efficiency through stable transmission precision:
·Its precision tooth profile ensures the camshaft rotation angle error is ≤ 0.5°, so the intake valve opening duration and lift strictly match the engine’s air intake demand. Especially during low-speed urban traffic following, it reduces insufficient air intake caused by valve opening/closing deviation and alleviates the "low-torque weakness" of small-displacement engines.
·Cooperating with the engine’s variable intake manifold technology, it ensures the intake valve and intake manifold airflow rhythm are synchronized through stable timing transmission, promoting uniform mixing of the air-fuel mixture and laying a foundation for efficient combustion.
Considering the sensitivity of family car users to maintenance costs, the sprocket emphasizes economy in design and supply:
·It has a simple structure without complex hydraulic or electronic control components, requiring no additional maintenance in the later stage. Only regular maintenance of the timing system is needed (e.g., checking synchronously when replacing the timing chain), reducing additional maintenance expenses.
·As a regular part in GM’s after-sales system, it has stable supply and affordable pricing (approximately 1/5 of the price of the original assembly). Meanwhile, no special tools are required for installation, and ordinary repair shops can complete the replacement, reducing labor costs by more than 30%.
2. Adapted to Engine Start-Stop System – Enhanced Component Fatigue Resistance
Most Buick Velite 1.4 models are equipped with an engine automatic start-stop system. Frequent start-stops increase fatigue loss of timing components, so this sprocket is specially designed to enhance fatigue resistance:
·It adopts an "integral forging" process instead of traditional casting, reducing internal stress concentration and increasing fatigue strength by 25%, which can withstand 10-15 start-stop cycles per day.
·The internal bearing position uses high-precision honing technology, combined with long-life grease, to reduce relative wear between the camshaft and sprocket during start-stop processes and extend the service life of the component.
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