|
CYLINDER BLOCK
|
| Material |
Cast Iron |
|
| Max. oversize with
or without liners |
0.040 in. |
(1.02
mm.) |
| Linering size
(Series I Alpine, Series III Rapier) |
3.254 in.
/3.255 in. |
(82.65/82.67
mm.) |
| Linering size
(Series 11, 111, IV Alpine, Series IIIA, IV Rapier) |
3.354 in. /3.355
in. |
(85.19/85.21 mm.) |
| Interference fit
|
0.002 in. /0.004 in. |
(0.051/0.102 mm.) |
| Dia. of main
bearing bore (without shells) |
2.3947 in. /2.3955 in. |
(60.82/60.84 mm.) |
|
CYLINDER HEAD
(for torque loading figures see table at end of section) |
| Material |
Aluminium |
|
| Size of cylinder
head studs |
3/8
in. U.N.F. |
|
| Valve guide
fit-see under "Valves". |
|
|
| Gasket-Type |
Pressing (Steel-Copper-Asbestos) |
|
| Thickness
|
030 in. (.76 mm.) Compressed |
|
|
VALVES |
| Position and
operation |
Overhead, push rods and rockers |
|
| Head diameter |
Inlet
|
1.436 in. /1.432
in. |
(36.47/36.37 mm.) |
| |
Inlet
(From chassis Nos. B3062665 and B.9117425) |
1.475 in. /1.471
in. |
(37.45/37.35 mm.) |
| |
Exhaust |
1.176 in. /1.172
in. |
(29.87/29.77
mm.) |
| Angle of seat in cylinder head |
Inlet and
Exhaust |
45º |
|
| Angle of valve face- |
Inlet and
Exhaust |
45º |
|
| Valve stem diameter |
Inlet |
3110 in. /.3105
in. |
(7.90/7.89 mm.) |
| |
Exhaust |
.3100 in. /.3095
in. |
(7.87/7.86 mm.) |
| Valve stem clearance in guide |
Inlet |
0010 in. /.0025
in. |
(.025/.064 mm.) |
| |
Exhaust
|
.0020 in. /.0035
in. |
(0.51/.089 mm.) |
| Length of valves (inlet and
exhaust) |
|
4.66 in. |
(118.36 mm.) |
| Type of springs |
|
Dual |
|
| Spring retention |
|
Cup and split cotters |
|
| Valve spring |
free length-Inner |
1.93 in.
|
(4.9 cms.) |
| |
Outer |
2.23 in.
|
(5.66 cms.) |
| Valve spring-fitted length |
Inner |
1.43 in. |
(3.63 cms.) |
| |
Outer |
1.55 in. |
(3.93 cms.) |
| Valve spring-load fitted |
Inner |
35.9lbs. |
(16.32
kg.) |
| |
Outer |
70.8 lbs. |
(32.20
kg.) |
| Guides- |
Inlet 2.0 in. (50.7 mm.) long X .5640/.5636 in. |
(14.3/14.27 mm.) O/dia. |
| |
Exhaust 2.15 in.
(54.6 mm.) long X .5640/.5636 in. |
(14.3/14.27 mm.) O/dia. |
| |
Interference fit
.0025/.0045 in. (.063/.114 mm.) |
|
| The valve guide
protrusion from the valve spring pocket face is controlled by a circlip
that fits in a groove in the outside of the valve guide. This circlip
rests on the cylinder head recess below the valve spring pocket. |
| Rocker clearance (Engine hot) |
Inlet |
.012 in. |
(.30
mm.) |
| |
Exhaust |
.014 in. |
(.35 mm.) |
| Timing |
inlet opens |
14º B.T.D.C. |
Up to B33100000 Sunbeam
Rapier) |
19º B.T.D.C.
|
(From
B.33100001Sunbeam Rapier) |
| |
inlet closes |
52º A.B.D.C. |
57º A.B.D.C. |
| |
exhaust opens |
56º B.B.D.C. |
(Up to B94100000
Sunbeam
Alpine) |
61º B.B.D.C. |
(From
B.94100001 Sunbeam Alpine) |
| |
exhaust closes |
10º A.T.D.C |
15º A.T.D.C. |
| Port diameter |
inlet |
1.31 in. |
(3.33 cms.) |
| |
Exhaust |
1.06 in. |
(2.69 cms.) |