how even should the cranking compression be between the lowest and highest cylinder readings on an engine…

how even should the cranking compression be between the lowest and highest cylinder readings on an engine without mechanical problems?\n\n○ a. maximum variation of 0% -5%\n○ b. maximum variation of 10% -15%\n○ c. maximum variation of 20% -25%\n○ d. maximum variation of 30% -35%\n\ncertainty? : ○c=1 (unsure: <67%) ○c=2 (mid: >67%) ○c=3 (quite sure: >80%)

how even should the cranking compression be between the lowest and highest cylinder readings on an engine without mechanical problems?\n\n○ a. maximum variation of 0% -5%\n○ b. maximum variation of 10% -15%\n○ c. maximum variation of 20% -25%\n○ d. maximum variation of 30% -35%\n\ncertainty? : ○c=1 (unsure: <67%) ○c=2 (mid: >67%) ○c=3 (quite sure: >80%)

Answer

Brief Explanations:

In engines, for normal operation without mechanical issues, the cranking - compression variation between the lowest and highest cylinder readings should be within a reasonable range. A maximum variation of 10% - 15% is considered acceptable to ensure balanced engine performance. Smaller variations like 0% - 5% are ideal but less common in practice, and larger variations can lead to problems such as rough idling, poor power output, and increased wear.

Answer:

B. Maximum variation of 10% - 15%