Frequently Asked Questions (FAQs)
1. What do pushrod guide plates do?
Pushrod guide plates are components that keep the pushrods aligned with the lifter cups and rocker arms in an engine. They prevent the pushrods from deflecting or moving sideways, ensuring proper operation. These guide plates are hardened to withstand wear and prolong their lifespan.
2. Do I need hardened pushrods with guide plates?
When using pushrod guide plates, it is recommended to also use hardened pushrods. However, if you are using stock head holes, hardened pushrods may not be necessary.
3. Do pushrods wear out?
Pushrods can wear out over time, especially if they are exposed to excessive heat. If pushrods start to turn blue due to heat, it is an indication that they need to be replaced. In racing applications, pushrods can be used for multiple seasons as long as they are not bent and show no signs of wear.
4. Why can't pushrod engines rev high?
Pushrod engines typically have two valves per cylinder, which limits their ability to take in enough air at higher rpm. This lack of airflow restricts the engine's ability to rev high. Most mass-market engines feature this design to maintain simplicity and cost-effectiveness.
5. What does changing pushrod length do?
Changing the pushrod length can have an impact on power production in the engine. Longer pushrods have been found to enhance power above a certain rpm range. However, they may produce similar peak torque numbers compared to other pushrod lengths. The effect of changing pushrod length is similar to adjusting valve lash in a conventional small-block engine.
6. Why use longer pushrods?
Using longer pushrods can help enhance power production in the engine, particularly at higher rpm ranges. However, it is important to note that longer pushrods may not significantly affect peak torque numbers. The change in pushrod length can have a similar effect to adjusting valve lash in a conventional small-block engine.
7. Why do I keep bending pushrods?
Bending pushrods can be a result of improper valve adjustment. If the valves are not adjusted correctly, it can lead to excessive force being applied to the pushrods, causing them to bend over time. Proper valve adjustment is crucial for the smooth operation and longevity of the pushrods.
