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

Ignition Timing: Specifications

Ignition Timing (Firing Point)
Timing At RPM TDC +/- 2 at Cranking Degrees At RPM (deg @ rpm)
Below 20 at Idle Degrees At RPM (deg @ rpm)
18 - 22 at 4000 Degrees At RPM (deg @ rpm)
Without vacuum, intake air temperature sensor plug pulled off.
29 - 33 at 4000 Degrees At RPM (deg @ rpm)
With vacuum, intake air tempertaure sensor plug pulled off.
Dwell 10 - 54 % or 9 - 49 degrees at Cranking rpm
30 - 60 % or 27 - 54 degrees at 4000 rpm