Porsche 1972 911 Workshop Manual page 954

911
I g n i t i o n s y s t e m
Testing of vacuum advance is accomplished on
the distributor test stand.
Vacuum Advance (ATC)
The advance point must b e between 4.3'
when vacuum is at
1 0 0
T h e distributor cut-off speed
engine is 3550
3150 rpm.
V A C U U M A D V A N C E C U R V E FOR D I S T R I B U T O R S I N 2 . 7 L I T E R CARRERA E N G I N E
B O S C H A N D M ARELLI
ATDC
Vacuum
-
65 Tort
40
-
54 78 Torr
and
Torr.
in
2.7 liter Carrera
Vacuum (Tort)
-