Lotus Evora - Cylinder Head; Valves & Springs; Camshafts; Pistons

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Lotus Service Notes Section TDT
CYLINDER HEAD
Material Aluminium alloy
Head face flatness tolerance 0.10 mm (0.004 in.)
Manifold face flatness tolerance 0.10 mm (0.004 in.)
Valve guide bore in head - std 10.285 to 10.306 mm (0.4049 to 0.4057 in.)
- 05mm o/s 10.335 to 10.356 mm (0.4069 to 0.4077 in.)
Valve guide standout - inlet 9.1 to 9.9 mm (0.36 to 0.39 in.)
- exhaust 9.3 to 9.7 mm (0.3661 to 0.3819 in.)
Maximum oil clearance - inlet 0.08 mm (0.0031 in.)
- exhaust 0.10 mm (0.0039 in.)
VALVES & SPRINGS
Valve stem diameter - inlet 5.470 to 5.485 mm (0.2154 to 0.2159 in.)
- exhaust 5.465 to 5.480 mm (0.2151 to 0.2157 in.)
Overall length - inlet - std 5.465 to 5.480 mm (0.2151 to 0.2157 in.)
- min 105.35 mm (4.1476 in.)
- exhaust - std 110.40 mm (4.3464 in.)
- min 109.90 mm (4.3268 in.)
Valve seat contact width - inlet 1.1 to 1.5 mm (0.043 to 0.059 in.)
- exhaust 1.2 to 1.6 mm (0.047 to 0.063 in.)
Valve head margin (thickness between head face and 45° face)
- std 1.00 mm (0.040 in.)
- minimum 0.50 mm (0.020 in.)
Valve spring free length 45.46 mm (1.790 in.)
CAMSHAFTS
Endfloat - std 0.08 to 0.13 mm (0.0031 to 0.0051 in.)
- service limit 0.15 mm (0.006 in.)
Maximum oil clearance - front journal 0.15 mm (0.006 in.)
- except front 0.09 mm (0.0035 in.)
PISTONS
Diameter 10mm below pin centreline - std 93.960 to 93.980 mm (3.6992 to 3.6999 in.)
- miniumum 93.830 mm (3.6941 in.)
Bore oil clearance - std 0.020 to 0.052 mm (0.0007 to 0.0020 in.)
- service limit 0.060 mm (0.0024 in.)
Gudgeon pin oil clearance - std 0.001 to 0.007 mm (0.00004 to 0.0003 in.)
- service limit 0.015 mm (0.0006 in.)
CRANKSHAFT
Main journal diameter 60.988 to 61.00 mm (2.4011 to 2.4016 in.)
Main journal max. runout 0.06 mm (0.0024 in.)
Main journal maximum taper and out-of-round 0.02 mm (0.0008 in.)
Crankpin diameter 52.992 to 53.000 mm (2.0863 to 2.0866 in.)
Crankpin maximum taper and out-of-round 0.02 mm (0.0008 in.)
OIL PUMP
Rotor tip clearance - std 0.060 to 0.160 mm (0.0024 to 0.0063 in.)
- service limit 0.16 mm (0.0063 in.)
Annulus to housing clearance - std 0.250 to 0.325 mm (0.0098 to 0.0128 in.)
- service limit 0.325 mm (0.0128 in.)
Rotor/annulus side clearance - std 0.030 to 0.090 mm (0.0012 to 0.0035 in.)
- service limit 0.090 mm (0.0035 in.)
Hot oil pressure - idle 80 kPa (0.8 kgf/cm2, 11.6 psi)
- 6,000 rpm 380 kPa (3.9 kgf/cm2, 55.5 psi)