MG MGB User Manual

ENGINE
TUNING
DATA
18V 77
9F
and 18V 780F
ENGINE—To
European
emission
control
requirements
(ECE 15)
ENGINE
Type
Displacement
..
Firing
order
Compression
ratio
Cranking
pressure
..
..
Valve
rocker
clearance:
set
cold
..
Idle
speed
Fast
idle speed
Stroboscopic ignition
timing
Static ignition
timing
Timing
mark location
DISTRIBUTOR
Make/Type
Contact
breaker
gap
..
Contact spring
tension
Rotation
of
rotor
Dwell
angle
Serial number
..
Centrifugal
advance
Crankshaft
degrees/Speed (vacuum
pipe
disconnected)
Vacuum
advance
Starts
Finishes
.
. ..
Total
crankshaft degrees
IGNITION
COIL
Make/Type
Resistance:
Primary
..
Consumption
..
SPARKING PLUGS
Make/
Type
Gap
CARBURETTERS
Make/Type
Speci■cation
.
Jet
Needle
Piston spring
..
EXHAUST
EMISSION
Exhaust
gas
analyser
reading
at
engine
idle speed
MGB. Issue
2. 89961
18V.
109.8
cu.
in.
(1798 c.c.).
1,
3, 4, 2.
9.0: 1
NOminal
170
lbf/in2
(11.95
kgf/cmz)
at
275
r.p.m
0.015
in.
(0.38 mm.).
850
r.p.m.
1,100
to
1,200
r.p.m.
11°
B.T.D.C.
at
1,000
r.p.m.
6°
B.T.D.C.
Pointer
on
timing
case,
notch
0n
crankshaft pulley.
Lucas/25D4.
0.014
to
0.016 in.
(0.35
to
0.40
mm.).
18
to
24
oz.
(510
to
680
gm).
Anti-clockwise.
60°13?
41234
or
41391.
0
to
1°at
600
r.p.m.
2
to
6°
at
1,200
r.p.m.
10
to
14°
at
2,200
r.p.m.
20
to
24°
at
3,600
r.p.m.
26
to
30°
at
4,500
r
pm.
28
to
32°
at
6,000
r
pm.
4 in.
Hg.
(102
mm.
Hg.).
12in.
Hg.
(305
mm.
Hg).
16°i2°.
Lucas/HAIZ.
3.1
to
3.5 ohms
at
20°
C.
(68°F.).
3.4
to
4.0
amps.
Champion/N9Y.
0.024
to
0.026 in.
(0.625
to
0.66
mm,).
SU/HIF4.
AUD 616.
0.090
in.
(2.2
mm.).
AAU.
Red.
3
to
4.5% CO.
Engine
Tuning
Data
7

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English