MG MGB User Manual

ENGINE
Type
..
.. ..
Number
of
cylinders
..
Bore
Stroke
_
..
Capacity
..
..
Combustion
chamber
volume
(valves
fitted)
..
Firing
order
Valve operation
..
Compression ratio:
H.C.
..
LC.
..
Compression
pressure:
H.C.
L.C.
Torque:
H.C.
..
L.C.
..
Engine idle
speed
(approx.)
Oversize
bore:
First
..
Max.
..
Crankshaft
Main
journal diameter
Crankpin
journal diameter
..
Crankshaft end-thrust
Crankshaft
end-■oat
Main bearings
Number and
type
Material
..
..
Length
.. ..
..
Diametrical clearance
Undersizes
Connecting
rods
Type
..
..
..
Length between
centres
Big-end bearings
Type
Material
..
.
..
Length
..
..
..
Diametrical
clearance
Undersizes
End-■oat
on
crankpin
(nominal)
..
Pistons
Type
..
.. ..
..
Clearance
in
cylinder: Top
Bottom
..
Number
of
rings
..
Width
of
ring
grooves:
Top
..
Second
..
Third
Oil control
Gudgeon
pin
bore
MGB. Issue
7. 80619
GENERAL
DATA
(18G/18GA)
18G, 18GA.
4.
3.16 in.
(80.26
mm).
3.5
in.
(89
mm.).
1798
c.c.
(109.8
cu.
in.).
42.5
to
43.5
c.c.
(2.59
to
2.65
cu.
in.).
1, 3, 4,
2.
Overhead by
push-rod.
8.8
:
1.
8.0
:
1.
160
lb./sq.
in.
(11.25
kg./cm.2).
1301b./sq.
in.
(9.15
kg./cm.2).
1101b.
ft.
(15.2
kg.m.)
at
3,000
r.p.m.
105 lb.
ft.
(14.5
kg.m.)
at
3,000
r.p.m.
500
r.p.m.
.010
in.
(.254
mm.).
.040
in.
(1.016
mm.).
2.1262
to
2.127
in.
(54.01
to
54.02
mm.).
1.8759
to
1.8764 in.
(47.648
to
47.661
mm.).
Taken
on
thrust
washers
at centre
main
bearing.
.004
to
.005
in.
(.10
to
.13
mm.).
Three
thinwall.
Steel-backed
copper-lead.
1%
in.
(28.5 mm.).
.001
to
.0027 in.
(.0254
to
.068
mm.).
—.010,~.020,
—.030
and —.040
in.
(—.254,
«.508,
—.762
and
«
1.016
mm.).
Angular-split
big-end, split
clamp small-end.
6.5
in.
(165.1
mm.).
Shell.
Steel-backed
copper-lead.
.995
to
1.005
in.
(25.2
to
25.52
mm.).
.001
to
.0027
in.
(.0254
to
.068
mm.).
—.010,—.020,
—.030
and —.040 in.
(—.254,_—.508,
—.762
and
—
1.016
mm.).
.008
to
.012
in.
(.20
to
.30
mm.).
Aluminium
solid skirt.
.0036
to
.0045
in.
(.091
to
.121
mm.).
.0018
to
.0024
in.
(.045
to
.060
mm.).
4
(3
compression,
1
'oil
control).
.064
to
.065
in.
(1.625
to
1.651
mm.).
.1578
to
.1588
in.
(4.008
to
4.033
mm.).
.7501
to
.7503 in.
(19.052
to_“19.057
mm.).
General
Data 1

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English