About Pushrod Length Calculator (Formula)
A Pushrod Length Calculator is a valuable tool used in engine building and automotive performance tuning to determine the correct length of pushrods in an internal combustion engine’s valve train system. Pushrods are crucial components that transfer the motion from the camshaft to the rocker arms, ultimately controlling the opening and closing of the engine’s valves. The proper pushrod length is essential to ensure precise valve timing and prevent engine damage. The formula for calculating the correct pushrod length is as follows:
Pushrod Length (PL) = Measured Length (ML) – Desired Preload (DP) + Length Change (LC)
Where:
- Pushrod Length (PL) is the calculated length of the pushrod that should be used in the engine.
- Measured Length (ML) is the length of the pushrod when measured with no preload.
- Desired Preload (DP) is the desired amount of preload on the lifter plunger. It is typically specified by the lifter manufacturer and ensures proper lifter operation.
- Length Change (LC) is the change in pushrod length that occurs due to the lifter preload and valve train geometry.
Calculating the correct pushrod length is a critical step in engine assembly and performance optimization. If the pushrods are too long or too short, it can lead to incorrect valve timing, reduced engine performance, and potential engine damage. The Pushrod Length Calculator helps engine builders and tuners determine the precise pushrod length required for their specific engine configuration.
To use the calculator, engine builders measure the pushrod length with no preload, obtain the desired preload specification from the lifter manufacturer, and factor in any length change due to lifter preload and valve train geometry. The result is the correct pushrod length that should be used in the engine.
In high-performance engine builds, optimizing pushrod length is crucial for achieving the desired valve timing and maximizing power output. The Pushrod Length Calculator simplifies this process, ensuring proper pushrod selection and contributing to the overall success of engine projects.