GENERAL
DATA-continued
(M
I
NI
-
COO
PER
-
con
tin
u e
d)
The following information is applicable to the 998-c.c. engine and should be used in conjunction with the preceding
specifications.
•
ENGINE
Type
Number
of
cylinders
Bore
Stroke
Capacity
Compression ratio: High
Low
B.M.E.P.: High compression
..
Low compression
Torque: High compression
Low compression
Compression pressures
..
Engine idle speed (approx.)
Oversize bores: 1st
2nd
CRANKSHAFT
Main bearings
Material
..
Running clearance
CONNECTING
RODS
Big-end bearings
, Material
B~.aring
length
..
PISTONS
Type
Clearance: Bottom
of
skirt (pressure face)
Oversizes: 1st
2nd
PISTON
RINGS
Compression: 'top
Second and third
Width
Thickness (all rings)
..
9FA.
..
4.
2·543 in. (64'588 mm.).
· . 3·00 in. (76,2 mm.).
· . 60·96 cu. in. (998 c.c.).
..
9:
1.
7·8 :
1.
142
lb.jsq. in. (10 kg.jcm.
2
)
at
3,000 Lp.m. -
135
lb.jsq. in. (9'5 kg.jcm.
2
)
at
3,000 r.p.m.
57
lb. ft. (7'881 kg. m.)
at
3,000 r.p.m.
56
lb. ft. (7'74 kg. m.) at 2,900 r.p.m.
..
165
lb.jsq. in. (11,6 kg.jcm.
2
).
500 r.p.m.
+·010
in. ('254 mm.).
+·020 in. (,508 mm.).
Steel-backed copper-lead
or
aluminium-tin; thin wall.
·001
to
·0027 in. (,025
to
·069 mm.).
Steel-backed copper-lead
or
aluminium-tin; thin wall.
·875 in. (22'22 mm.).
Solid skirt.
·0005
to
·0011
in. (,013
to
·028 mm.).
+,010
in. (,254 mm.).
+·020
in. ('508 mm.).
Plain, chrome-faced.
Tapered.
·0620
to
·0625 in. (1,574
to
1'588 mm.).
· . ·106
to
·112 in. (2'692
to
2·835 mm.).
•
•
GUDGEON
PIN
Type
Fit
in piston
Fit
in small end
Diameter
..
General
Data
12
Fully floating, with circlip location.
·0001 in. ('0025 mm.) tight
to
·00035 in. ('0089 mm.)
slack. •
·0002 in. ('005 mm.) slack,
to
size. .
·6244 in. (15,86 mm.)
to
·6247 in. (15,867 mm.).
MINI. Issue
1.
4908
mk1-performance-conversions.co.uk
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