Ignition System From 1978 Models - Porsche 911 TURBO - 1989 Workshop Manual

Ignition System
CHECKING IGNITION TIMING CONTROL FROM 1978 MODELS
Requirement: ignition timing correct.
Checking Ignition Angle:
Europe
California. Japan:
At eng~e weed of 4000 rpm ignition angle must
be 310 -4 before TDC.
(Vacuum hose disconnected, but high pressure
hose can remain connected as long as the test is
made without engine load.)
+
At idle speed of 1000 -50 rpm ignition angle must
0+ 0
be between 0 -2 .
(Vacuum hose connected.)
USA
At en§i~e weed of 4000 rpm ignition angle must
be 26 -4 before TDC.
(Vacuum hose disconnected.)
If specified values are not reached, remove distri-
butor and check in a test bench.
CENTRIFUGAL ADVANCE CURVE TURBO ENGINE FROM MODEL 78. EUROPE
BTDC
150 I
it
100
~
4000
2500
3000
3500
50 -
ATDC 500 1000
Distributor Shaft Speed (rpm)
1500
2000
Checking Ignition Timing Control
28 -4 c
Printed in Germany
-IV. 1981