Rotary Engine Compression Check Instructions

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Compression Check Howto

A compression reading can be taken for a rotary engine using a regular compression gauge. The check valve for the gauge must be removed however so that a reading cannot be held. The check valve can simply be unscrewed from inside the spark plug hole adaptor of the gauge.

  • Remove trailing plugs.
  • Block throttle wide open.
  • Disconnect the crank angle sensor's electrical connector. (white clip with 4 wires running out)
  • Pull EGI fuse.
  • Connect gauge to plug hole.
  • Depress clutch and crank for several seconds.
  • Watch for even bounces, not numbers.
  • Repeat for other rotor.
  • Absolute values can be recorded by reinstalling the check valve.


Interpretation of readings

  • 3 even bounces of at least 85 PSI is OK.
  • 3 even bounces of less than 85 PSI means motor is tired.
  • 2 high and 1 low = blown or weak side seal.
  • 1 high and 2 low = blown or weak apex seal.

Optimum Compression Numbers

need to add

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