116+ PSI, tightly balanced faces.
SYMPLE UTILITY / 04
Rotary Compression
Interpreter
Normalize six-face readings to 250 rpm at sea level and get a quick condition assessment.
READINGS
Enter test results
Use readings from a rotary-specific compression tester. All six faces and test conditions matter.
INTERPRETATION GUIDE · PSI
109+ PSI with low variation.
102+ PSI and serviceable balance.
Near minimum or excessive variation.
85–98.5 PSI or over 21.8 PSI face spread.
Below 85 PSI. Hard starting is likely and an engine rebuild may be required.