GENERAL
DATA
"ENGINE
Type
Number
of
cylinders
Bore
Stroke
Capacity
Firing order
Compression ratio
Capacity
of
combustion chamber (valves fitted)
Valve operation
B.M.E.P
...
Torque
Compression pressure
Engine idle speed (approx.)
Oversize bore: 1
st
Max.
8MB.
4.
..
2·478 in. (62,94 mm.).
2·687 in. (68,26 mm.).
51·7 cu. in. (848 cc.).
. .
1,
3,4,2.
.,
8·3:
1.
. . 1·49 cu. in. (24,5 cc.).
..
Overhead by push-rod.
128 lb./sq. in. (9 kg./cm.
2
)
at
2,900 r.p.m.
..
44 lb. ft. (6,08 kg. m.)
at
2,900 r.p.m.
150 lb./sq. in. (10,5 kg./cm.
2
).'
..
500 r.p.m.
+'010
in. ('254 mm.).
+'040
in. (1,016 mm.).
•
CRANKSHAFT
Main
journal
diameter
Minimum regr'ind diameter
Crankpin
journal
diameter
Crankpin
minimum regrind diameter
Main
bearings
Number
and
type
Material
Length
..
End-clearance
..
End-thrust
Running clearance
1·7505
to
1·751 in. (44,46
to
44-47 mm.).
1·7105 in. (43,45 mm.).
. . 1·6254
to
1·6259 in. (41'28
to
41·29 mm.).
1·5854 in. (40,27 mm.).
..
3 shell type.
..
Steel-backed white metal.
1·187 in. (30'16 mm.).
·0002
to
·003 in. (,051
to
·076 mm.).
..
Taken
on centre
main
bearing.
..
·0005
to
·002 in. (,013
to
·051
mm.).
_
"i~
';""
....
,
I~>";
..
5·75 in. (14,605 cm.).
-
'~
Split skirt.
. . ·0006
to ·0012 in. ('015
to
·030 mm.).
·0026
to
·0032 in. ('066
to
·081
mm.).
+.010
in.,
+·020
in.,
+·030
in.,
+·040
in.
('254 mm., ·508 mm., ·762 mm., 1·016
mm.).;',,·-
. . Steel-backed· lead-bronze with
lead-indium-plat'd
surface,
or
steel-backed copper-lead
wi$:
lelJd-
tin-plated
surface....::,
. 'j
·008
to
·012 in. (,203
to
·305 mm.).
,'\-~
.001
to
·0025 in. (,025
to
·063 mmij., \ it 'It
\~~
Bearing side-clearance
Bearing diametrical clearance
CON.r.cTING
RODS
Length between centres
..
Big-end bearings
Material
PISTONS
Type
-':, Clearances:
Bottom
of
skirt
Top
of
skirt
Oversizes
..
PISTON RINGS
Compression: Plain
Tapered
..
Width
Thickness
Fitted
gap
Clearance
in
groove
MINI Issue
1.
4908
Top
ring.
. . Second
and
third
rings.
..
·069
to
·070 in. (1,75
to
1·78 mm.).
..
·095
to
·101
in.
~'41
to
2·56 mm.).
·007
to
·012 in.'(·178 to;·305 mm.).
·0015
to
·0035 in. (,038
to
·089 mm')'6+
'.
mk1-performance-conversions.co.uk
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