Volvo 819 E - Page 35

Group 28 Igni t ion systems
Design and function - Compensation functions
Q' -b
Q' -2b
Q' -3b
a
b
·•
•
,
,
,
I ~ __ ...
I ~ ~ _ .. ,.. ..
L~----1
,
,
,
,
,
,
,
I ~ __ ...
L-~~--i
r
~-~-l \-;---
><~--~_ ..
'47 ' 00
Timing compensation applied by different ignition systems to correct knock
Fig. 3: '" = basic timing as computed
a = max . knock-controlled retardation
b = knock retardation step
c
~ re-advance step
d = re-advance interval
The
following is a summary of the compensation values applied by the var io us systems in the event of knock:
EZ-l02K:
EZ-l17K:
Max . knock-controlled retardation:
Knock retardation step:
Re-advance step:
Re-advance interval:
Max . knock ~con trolled retardation:
Knock retardation step:
Re - advance step:
Re-advance interval:
9.8'
2 .8'
0.35'
Specified number of engine
revolutions depending on speed
13" (B230F); 9.8"' { B230FT)
2.8'
0.37'
Specified
number of engine
revolutions depending on speed
Re-advance step:
Re-advance interval:
revolutions depending on speed
EZ-118K:
lvalues for B230K, 1985 -8 6; 8230E and B200E respectivelyl
Max . knock-c ontrolled retardation: 15" ,16 ", 9.8"',12.6"
Knock retardation step: 2 .8"', 2.8"'-8.7" (depending
on speed!. 2.8 ", 2.8"'
0.35" in all cases
Specified
number of engine
EZ- 115K:
EZ-116K:
Rex-I:
Max . knock-controlled retardation:
Knock retardation step :
Re-advance
step:
Re-advance interval:
Max . knock-controlled retardation :
Knock ret
ardation step:
Re-advance
step :
Re-advance
interval:
Max . knock-eontrolled retardation:
Knock retardation step:
Re - advance step:
Re-advance
interval:
11-15 " depending on variant
3"
0.37"
Specified number of engine
revolutions depending on speed
,.-
2.6" at n < 4895 r/ min and
2.3" at n > 4895 rfmin
0.375"
Specified
number of engine
revolut io ns depending on speed
15"
-3 " at n > 4895 r /min
,"
Specified number of engine
revolutions depending on speed
33