Valves And Valve Springs; Valve Specitications - Honda Prelude 1993 Service Manual

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Valves and Valve Springs
The valves are opened and closed by rocke. arms driven by the camshatt.
Light weight and large diameter valves made ot a high strength metal with small diameter stems are used. The air
resistance is decreased by the slender stems and the intake efticiency is inc.eased by inlet ports that match with laroe
diameter valves,
Valve specitications
U n i t : m m ( i n )
VALVE
I T E M
INTAKE
EXHAUST
HEAD DIAMETER
3 5 . O ( 1 . 3 8 )
3 0 . o { 1 . 1 8 )
STEM DIAMETER
5.5 tO.22l
5.5 lO.22l
OVERALL LENGTH r 0 6 . 7 5 ( 4 . 2 0 3 )
' 1 0 6 . 9 5 ( 4 . 2 r
1 )
VALVE LIFT
Secondary: 8.O (O.31 )
M i d :
1 1 . 5 ( O . 4 5 ) *
P r i m a r y : 6 . 5 ( O . 2 6 )
S e c o n d a r y : 7 . 5 ( O . 3 O )
M i d :
1 O . 5 ( O . 4 1 1 *
P r i m a r y : 6 . O { 0 . 2 4 )
* Indicates high-speed valves
I
oVERALL LENGTH
Fr
| | , / | l
ffir
HEAD
DIAMETER
The valve spring wire uses a moditied cross-section to valve lift in a limited soace.
EGG SHAPE
LEMON SHAPE
5 - 1 1