**This is a replay from the old podcast series lost to the internet**

Original upload

What is dynamic compression ratio? It is not commonly known. Most are familiar with static compression ratio used to describe a characteristic of engine. But what is the difference of dynamic compression ratio vs static?

Static compression ratio uses the volume associated with a full sweep of the piston from bottom dead centre through to top dead centre. Dynamic compression ratio is governed by the stroke derived from when the intake valve closes which is normally after bottom dead centre.

Longer duration cams cause the intake valve to close later reducing the dynamic stroke and as such the dynamic compression ratio.

Link to spreadsheet: https://kyushaspeed.com.au/shop/dynamic-compression-ratio-calculator/

Link to blog: https://kyushaspeed.com.au/what-is-dynamic-compression-ratio/

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