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title=Compression Test Spread Analyzer meta_title=Compression Test Spread Analyzer description=Analyze compression test results to see cylinder spread, averages, and red flags. canonical=https://troubleshootyourvehicle.com/tools/compression-test-spread-analyzer >

Compression Test Spread Analyzer

Analyze Your Compression Results

Use warm-engine, wide-open throttle test numbers for best accuracy.

How to Read the Results

Compression should be fairly even across cylinders. A large spread suggests a mechanical issue like worn rings, leaking valves, or a head gasket problem.

  • Up to 10% spread: Usually healthy.
  • 10-15% spread: Borderline; watch trends and symptoms.
  • Over 15% spread: Investigate further.