Porsche 928 Workshop Manual page 514

28
Ignition System
928
VP=
IGNITION ADJUSTING AND TESTING VALUES
Ignition timing
(without vacuum)
Advance installed
Retard insraIled
Idle speed (rpm)
Centrifugal advance
(without vacuum)
"aC"llll?
advance
(at idle speed)
degrees of
"advance"
adjustment
Speed increase
Vacuum
retard degrees
of retard adjustmenr
(at idle speed)
"re:ard"
928
M 28/13/14
23' BTDC at
3000 rpm
ye=
Ye=
750 f 50
8 to 10' BTDC
at idle speed
29 to 34' BTDC
at 6000 rpm
Vacuum hose of
CO"". 2 0" CO"".
1
8 to 12O
turned back
below 1000 rpm
Vacuum hose
(connection 2)
connected
41080
refer Porsche to
their publication
4592. 21(928
Service Information)
page 73. Ignition
timing specs. do not
agree!
a
a
a
28 22
Ignition Adjusting and Testing Values
Printed in Germany