0720 – Spring Oil Hole
In the dynamic world of Nascar racing, the importance of a consistent oil supply to valve springs for prolonged durability has been well-established. Recognizing this need, the practice of oiling valve covers or employing spray bar oiling systems was conceived. Originally implemented through a -4 oil line connected to the valve cover, a small tube with precision-engineered oil holes directed oil straight onto the valve springs. Subsequently, the oiling mechanism transitioned from the valve cover to the stand itself, evolving to the point of flooding the valve cover area with oil. This strategic lubrication method not only extended the lifespan of valve springs but also contributed to maintaining optimal operating temperatures.
The 0720 Spring Oil Hole Option
Capitalizing on the internal oiling feature of our rocker arm, which benefits from actual engine oil pressure at the fulcrum, we proudly introduce the 0720 spring oil hole option. With this option, a strategically placed .040 hole intersects between the two bearings of the rocker arm, channeling oil precisely to the valve springs throughout the entire lift cycle. This option has garnered significant popularity, particularly in circle track racing and Drag and Drive events, showcasing its effectiveness in high endurance racing environments. However, it is essential to note that it may not be as beneficial for drag racing only applications due to shorter engine run times.
Performance and Endurance
Feedback from discerning engine builders, who meticulously monitor wear indicators such as valve springs, consistently attests to the prolonged life and increased intervals between spring replacements. The 0720 spring oil hole option has proven to be a cost-effective alternative when compared to traditional spray bar oiling methods within the valve cover. Its affordability, coupled with the tangible benefits of enhanced spring longevity, positions it as a prudent investment that pays dividends over the long term.
In conclusion, the T&D Shaft Mount Rocker Arms’ 0720 spring oil hole option stands as a testament to our commitment to providing cutting-edge solutions for the demanding world of high-performance racing engines.
0721 – Bushed Rockers
T&D has been at the forefront of innovation in the realm of high-performance engine components, and our commitment to delivering optimal solutions is reflected in the introduction of the 0721 Bushed Rocker option, a feature pioneered by us approximately a decade ago. Initially designed to meet the demanding requirements of the desert off-road racing community, this option has proven to be a reliable choice for applications subjected to harsh conditions over extended periods.
Rationale:
The decision to offer the bushed rocker option was driven by the recognition of the rigorous environments in which these rockers operate, particularly in desert off-road racing. The relentless conditions expose components to extreme stress, with oil degradation and contamination presenting significant challenges over prolonged durations. In response to these challenges, the incorporation of bushings emerged as a superior choice, offering enhanced durability and longevity in the face of sustained abuse.
Key Features:
- Long-Term Durability: The 0721 Bushed Rocker option is engineered to withstand the prolonged abuse encountered in harsh racing conditions, ensuring longevity and reliability.
- Enhanced Resistance: The incorporation of bushings provides increased resistance to the effects of oil breakdown and contamination, mitigating potential issues associated with extended usage.
- Internal Oil Holes: A pivotal feature of this option is the presence of internal oil holes within the rocker itself. These strategically positioned orifices facilitate the direct supply of engine oil pressure to the bushing, optimizing lubrication and further contributing to the longevity of the component.
In summary, the 0721 Bushed Rocker option from T&D represents a testament to our dedication to providing high-performance solutions that stand up to the most demanding conditions. Through careful engineering and attention to detail, this option ensures the longevity and reliability required for applications subjected to the brutal environments of desert off-road racing. Trust in T&D for superior performance and durability in the world of engine components.
0727 – Steel Rocker Option
When constructing an engine, careful consideration must be given to the materials used, particularly in components like aluminum that can be susceptible to fatigue. Like aluminum connecting rods, aluminum rocker arms have a lifespan, necessitating periodic replacement before potential failure. To address this concern and for engines that demand more in terms of endurance, T&D offers a steel rocker option.
Evolution of Engine Performance: The evolution of cam profiles towards more aggressive configurations, coupled with the prevalence of higher horsepower engines on the street, has prompted a need for increased longevity. Applications involving turbos, blowers, and nitrous further amplify the stress on engine components. In response to these demands, our 0727 Steel Rocker Option emerges as a strategic solution.
Benefits of Steel Rockers:
- Enhanced Stiffness and Reduced Deflection:
- In scenarios with aggressive cam profiles featuring quick ramp speeds, the stiffness of steel rocker arms becomes advantageous, minimizing deflection during operation.
- Force Fed Applications:
- Particularly beneficial in force-fed applications like turbochargers, blowers, and nitrous systems. The 0727 Steel Rocker Option excels on the exhaust side, efficiently managing the pressure generated as the rocker arm opens the valve, coinciding with the expulsion of expanding hot gases.
- Endurance Applications:
- Recommended for street and marine use, where the high cycle time of rocker arms transforms the application into an endurance scenario. The inherent endurance of steel, devoid of the fatigue factor associated with aluminum, positions it as the preferred choice for extended operational life.
- Infinite Lifespan:
- Unlike aluminum, steel does not succumb to fatigue, offering an essentially infinite lifespan. Barring catastrophic engine failures, the 0727 Steel Rocker Option ensures prolonged and reliable performance.
Conclusion: As engines continue to evolve and face increasing demands in performance and longevity, our 0727 Steel Rocker Option stands as a testament to innovation. Tailored to meet the challenges posed by aggressive cam profiles, force-fed applications, and high-cycle endurance scenarios, this option reinforces the commitment to durability and reliability in engine components.
Click here for a more detailed breakdown of Steel vs Aluminum Rockers.
0728 – Shot Peening
Shot peening is a cold working process employed to generate a compressive residual stress layer and modify the mechanical properties of metals and composites. This process involves impacting a surface with shot, which consists of round metallic, glass, or ceramic particles. The force applied during shot peening induces plastic deformation, enhancing the strength and stress relief properties of various components.
At T&D, the shaft mount rocker arm shot peen option utilizes this innovative shot peening process. Unlike traditional approaches that focus on material removal, shot peening leverages the principle of plasticity, treating each particle as a ball-peen hammer. This unique mechanical treatment is akin to sandblasting but aims to achieve plastic deformation rather than material removal.
Other Automotive Applications
Shot peening is widely employed in machining processes to fortify and alleviate stress in critical components such as steel automobile crankshafts and connecting rods. The resultant compressive residual stress layer contributes to increased durability and performance, thereby extending the operational life of the rocker arm.
Benefits of Shot Peening for Rocker Arms
The integration of the 0728 shot peen rocker option in T&D shaft mount rocker arms provides tangible benefits. By strategically reducing stress risers within the rocker body, shot peening significantly extends the operational life of the rocker arm. This enhancement in durability translates to improved performance and reliability in demanding conditions.
Conclusion
In summary, the utilization of shot peening, specifically with the 0728 option, represents a key advancement in the design and manufacturing of T&D shaft mount rocker arms. This innovative process not only strengthens the rocker arm but also contributes to stress relief, leading to a prolonged and reliable operational life.
0730 – Lightweight Rockers
For engine builders who have invested time in research and engine development utilizing SpinTrons, T&D shaft mount rocker arms offer a specialized 0730 lightweight rocker option. This unique modification is designed to enhance performance and precision in controlled environments, where rocker arms will only operate with known spring rates and specific RPM confinements.
Description:
The 0730 lightweight rocker option is characterized by a meticulously milled slot on the top of the rocker arm, extending from the adjuster screw to the roller tip. This precision machining strategically removes material from the rocker arm, resulting in a reduction in overall weight on the rocker and, more importantly, directly over the valve. The Lightweight Rocker Arm options is a testament to T&D’s commitment to providing precision-engineered components for engine builders with the strictest demands in engine components.
0731 – Needle Bearing Tips
The 0731 needle bearing tip option for T&D shaft mount rocker arms is a highly recommended feature for reducing friction in engine applications that use more aggressive cam profiles.
Enhanced Guide Life: The needle bearing tip option is particularly advantageous when lift exceeds 0.850 inches or when open spring pressures are above 900 PSI. In such scenarios, the needle bearings contribute to improved guide life, offering durability and longevity in high-stress conditions.
Smoother Roller Movement: Needle bearings exhibit smoother rolling motion under high loads, especially in applications with significant valve lift. This characteristic minimizes friction and wear on the valve stem, promoting extended guide life compared to standard roller alternatives.
Resilience in Low Oil Environments: Needle bearings are well-suited for environments with limited oil supply to the top end. In instances of oil starvation or restriction, the needle bearings demonstrate superior survival capabilities, ensuring continued functionality and reliability.
Conclusion:
The 0731 needle bearing tip option for T&D shaft mount rocker arms provides a reliable solution for users seeking durability in in more demanding racing applications. With smoother roller movement and resilience in challenging environments, this option stands as a valuable choice for those prioritizing long-term performance and reliability.