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Understanding Pushrod Length and Factors Influencing it in Engine Components

Explore how rocker arms, lifters, lifter preload, and other factors can affect the required pushrod length in engines. Learn about valve springs, cylinder head surface, gasket thickness, and more. Find out how different components impact pushrod length measurements in engine cylinders.

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Understanding Pushrod Length and Factors Influencing it in Engine Components

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  1. Rocker Arm Pushrod Length Lifter Plunger Preload Lifter

  2. Aftermarket rocker arms with different geometry can have an effect on the needed pushrod length Anything that causes stem protrusion to change can have an effect on the needed pushrod length. Valve Spring Surface (part of cylinder head) Anything that changes the overall height of the cylinder head can have an effect on the needed pushrod length Changes in head gasket thickness can have an effect on the needed pushrod length Anything that changes the overall height of the cylinder can have an effect on the needed pushrod length Changes in base gasket thickness can have an effect on the needed pushrod length A different type of lifter can have an effect on the needed pushrod length Cams with a different base circle can have an effect on needed pushrod length

  3. Top Dead Center on Overlap Exhaust Intake Exhaust Valve Almost Closed Intake Valve Starting to Open Measure from case deck down to top of lifter Measure from case deck down to top of lifter

  4. Top Dead Center on Compression Exhaust Intake Both Valves Closed Measure from case deck down to top of lifter Measure from case deck down to top of lifter

  5. .100” ideal preload .200” available travel Lifter plunger

  6. TDC Overlap TDC Compression TDC Overlap Intake Stroke Compression Stroke Power Stroke Exhaust Stroke BDC BDC Intake Valve Open Shown in Red Exhaust Valve Open Shown in Blue

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