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

Compression Check

Compression pressure

Standard: 830 kPa {8.5 kgf-cm2, 120 psi} [250 rpm]
Minimum: 680 kPa {6.9 kgf-cm2, 98.6 psi} [250 rpm]
Standard difference in chambers: Within 150 kPa {1.5 kgf-cm2, 21.8psi}
Standard difference in rotors: Within 100 kPa {1.0 kgf-cm2, 14.5 psi}