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)

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Compression Check

The compression in the cylinder that is tested
The pressure is measured in bars.
1 bar = 14.5 psi.
There are various diagram charts. The charts for petrol engines are used.

Difference in pressure between the individual cylinders
The pressure difference between two cylinders must not be greater than 1.5 bars.