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I G N I T I O N D I S T R I B U T O R FOR 2 . 7 LITER E N G I N E S
Beginning with 1974 models. Type 911 (2.7 liter) and 911 S (2.7 liter) engines are equipped with the
BOSCH or MARELLI distributors formerly used in the Type 911 T (2.4 liter) engines. Ignition timing
spark advance characteristics, and test specifications applicable to the 2.4 liter engine are also
continued.
The cutoff speed in both engine types is 6500
The BOSCH or MARELLI distributors used in the 2.7 liter CARRERA engines differ from the above
described distributors due to a different spark advance characteristic.
Ignition timing a t idle is on TDC. Upon opening of the throttle valve, the drop in manifold negative
pressure (vacuum) results in the ignition point advancing by 10' crankshaft rotation.
The CARRBRA cutoff speed
The distributor used in the 1973 model 2.7 CARRERA engines remains in use in 1974 model
engines as well.
D I S T R I B U T O R
The distributor advance curves on pages 9.3
1976 model 911 S.
The cutoff speeds of the speed limiter are for
911 S
200 ipm.
7300 rpm.
is
1 9 7 6 MODEL
-
6500
200 rpm
I g n i t i o n D e s c r i p t i o n
-
-
2/3 and 9.3
2/4 also apply to the
911
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