Description

4-Stroke In-Cylinder Running Compression Waveform:
Waveform Physical Map with Full Diagnostic Descriptions

This highly descriptive and visual In-Cylinder Running Compression Waveform Legend and Diagnostic Chart is based on a known good Non-VVT/VVL (variable valve lift/ variable valve timing) engine at idle. We recommend to print and laminate this chart, so it can live next to the scope in the shop.

Remember that engines, both VVT and conventional, will exhibit slightly different characteristics. Modeling of your specific engine’s characteristics may be necessary, depending on your diagnostic goal. If you have any questions or need help interpreting your findings, feel free to contact us.