Lotus 1972 EUROPA, Workshop Manual

Page: 11 / 21

---------------------------------------------------------------------------------------- Section Updated: 2/5/2009 6:53 AM at http://www.lotus-europa.com ----------------------------------------------------------------------------------------
10
Cylinder Head
Material Aluminium
Valve timing - Inlet opens 35° B.T.D.C.
- Inlet closes 65° A.B.D.C.
- Exhaust opens 65° B.B.D.C.
- Exhaust closes 35° A.T.D.C.
Angle of valve seats and faces 45°
Valves - Head diameter - Inlet 1.476 in. (37.5 mm.)
- Exhaust 1.220 in. (31 mm.)
- Stem diameter - Inlet .315 in. (8 mm.)
- Exhaust .315 in. (8 mm.)
- Stem clearance in guide - Inlet .0010/.0018 in. (.025/.045 mm.)
- Exhaust .0016/.0024 in. (.040/.060 mm.)
- Clearance (cold) - Inlet .008 in. (.20 mm.)
- Exhaust .010 in. (.25 mm.)
Valve springs - Type Helical, double
- Free length - Inner 1.492 in. (37.89 mm.)
- Outer 1.929 in. (49 mm.)
Valve guides - Length - Inlet 1.968 in. (50 mm.)
- Exhaust 1.968 in. (50 mm.)
- Fitted height above head .472 in. (12 mm.)
Camshaft
Number and type of bearings 4, white metal
Journal diameter 1.653 in. (42 mm.)
Bearing running clearance .001/.0029 in. (.025/.075 mm.)
End float .002/.0047 in. (.05/. 12 mm.)
Tappets - Standard .473 in. (12 mm.)
- Oversize .480 in. (12.2 mm.)
Drive - Type Chain
- Number of pitches 72
- Length (of pitch) .375 in. (9.525 mm.)
- Width (of pitch) .225 in. (5.72 mm.)