Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Pressure/Variation

Cylinder Compression
Normal Compression:
Minimum 10 bar
Maximum 14 bar
Fuel Optimized:
Minimum 6 bar
Maximum 10 bar
Permissible Difference Between Cylinders 1.5 bar

NOTE: Test data with engine at normal operating temperature and all spark plugs removed.