Timing drive systems are a critical component of any internal combustion engine, ensuring that the camshaft and crankshaft remain synchronized for optimal valve timing and engine performance. Among the various timing chain systems available, Cloyes' True Roller Timing Sets have become a trusted choice for both OEM and aftermarket applications. Developed by Cloyes, a Tier 1 supplier to major automakers like General Motors, Fiat Chrysler, Ford, and Nissan, these timing kits are engineered for durability, performance, and ease of installation. This article provides a detailed technical overview of Cloyes True Roller Timing Sets, along with installation guidance and considerations for high-performance engine builds.
Understanding the Cloyes True Roller Timing System
Cloyes' True Roller Timing Sets are distinguished by their advanced roller chain design, which minimizes friction and wear while maintaining precise timing. Unlike standard roller chains that feature fixed rollers or pins, the True Roller system uses rotating pins or rollers that spin as they engage the gear teeth. This design significantly reduces friction and wear, offering a quieter and more durable timing solution.
The True Roller concept was first introduced by Cloyes in 1970 and has since become a benchmark in the high-performance and OEM sectors. These timing sets are available in both single and double roller configurations, depending on the application. Single roller chains are commonly used in modern OEM engines and high-performance street applications, while double roller chains are preferred in high-horsepower builds where harmonic stability is crucial.
A typical Cloyes Timing Kit includes the following components: - Crankshaft Sprocket - Camshaft Sprocket - Timing Chain - Tensioner - Guides
Each component is CAD-designed and manufactured using premium materials to ensure optimal performance and longevity. The kits are engineered to meet or exceed OEM specifications, ensuring compatibility and reliability across a wide range of vehicle applications.
Installation Considerations for Cloyes Timing Sets
Proper installation of a Cloyes True Roller Timing Set is essential to maintaining engine performance and preventing mechanical failures. While the installation process varies depending on the specific engine and application, general best practices include the use of clean, well-maintained tools, and adherence to manufacturer specifications.
One critical aspect of installation is the alignment of the crankshaft and camshaft sprockets. In some cases, especially in high-performance builds, the timing can be adjusted to optimize engine output. Cloyes offers 9-keyway crank sprockets that allow for precise timing adjustments. These sprockets enable the installer to advance or retard the camshaft timing by positioning the sprocket in different keyways. For example, placing the sprocket in the 2°, 4°, 6°, or 8° advance or retard keyway allows for a corresponding adjustment in the camshaft timing, which can enhance low-end torque or high-RPM horsepower depending on the application.
The 9-keyway system is particularly useful for engines with performance-oriented camshafts, where manufacturers often recommend timing adjustments to optimize valve events. It is important to note that the camshaft angle corresponds to half of the crankshaft angle due to the four-stroke engine cycle, so a 2° advance in the crankshaft will result in a 1° advance in the camshaft.
In addition to sprocket alignment, the installation of the timing cover is a critical step in the process. Cloyes recommends using a Quick Button® Timing Cover, which simplifies the installation process and ensures a secure fit. The cover should be mounted over the aligning pins on the engine block, and the mounting screws should be torqued to the specified 160 in-lb (13 ft-lb) using a 3/16" hex wrench. A small amount of gasket sealer may be applied if desired to prevent leaks.
Another important consideration during installation is the use of an oil seal. The oil seal should be carefully tapped into the timing cover until it is flush with the surface. It is crucial to keep the seal straight during installation to avoid misalignment, which can lead to oil leaks. The camshaft sprocket should also be pushed firmly against the engine block to remove any endplay before the timing cover is installed.
Technical Specifications and Performance Benefits
Cloyes True Roller Timing Sets are designed for both OEM and aftermarket applications, and they are available for a wide range of vehicle models and engine configurations. The timing kits are compatible with various General Motors, Chrysler, Ford, and Nissan engines, including models such as the Chevrolet Camaro, Silverado, and Cadillac CTS, among others.
One of the key advantages of the True Roller design is its ability to reduce friction and wear compared to standard roller chains. The rotating pins and rollers help to distribute the load more evenly across the chain links, reducing stress on individual components and extending the lifespan of the timing system. This design also helps to minimize noise and vibration, making the timing set more suitable for high-performance applications.
In addition to the standard roller chains, Cloyes also offers single and double roller configurations. Single roller chains are ideal for most street performance applications, while double roller chains are better suited for high-horsepower engines where harmonic stability is a concern. The double roller design provides additional support and reduces the risk of chain whip, which can occur when the chain is subjected to high loads and RPMs.
Another important feature of Cloyes Timing Sets is the use of high-quality materials and precision manufacturing techniques. The sprockets are typically made from durable steel or aluminum, depending on the application, and the timing chains are constructed using hardened steel links and rollers. These materials ensure that the timing set can withstand the high temperatures and mechanical stresses associated with engine operation.
Maintenance and Longevity
While Cloyes Timing Sets are designed for durability and long-term performance, regular maintenance is still recommended to ensure optimal function. It is important to periodically inspect the timing chain and related components for signs of wear, such as elongation, misalignment, or excessive slack. If any issues are detected, the timing set should be replaced to prevent potential engine damage.
One common issue with roller timing chains is the phenomenon known as "chordal action," where the chain forms an "S" shape as it turns over the gear teeth. This can lead to chain weakening and affect valve timing, ignition timing, and mechanical oil and fuel pumps. To mitigate this issue, it is important to use high-quality tensioners and guides that help keep the chain in proper alignment.
Cloyes Timing Sets also include tensioners and guides that are specifically designed to work with the True Roller chain. These components help maintain the correct tension and alignment of the chain, reducing the risk of slippage or misalignment. It is important to follow the manufacturer's instructions when installing these components to ensure that they function properly.
Conclusion
Cloyes True Roller Timing Sets offer a reliable and high-performance solution for both OEM and aftermarket applications. With their advanced roller chain design, these timing sets provide reduced friction, improved durability, and precise timing control. Whether you are building a high-performance engine or replacing a worn-out timing set, Cloyes offers a range of options to suit your needs.
Proper installation is essential to ensuring the longevity and performance of the timing system. By following the manufacturer's instructions and using the correct tools and techniques, you can ensure that your engine runs smoothly and efficiently. Whether you are a professional mechanic or a DIY enthusiast, Cloyes Timing Sets are a trusted choice for anyone looking to improve engine performance and reliability.