Cylinder Head; Technical Data, Valve Drive - Porsche Cayenne V6 2008 Service Information

Cylinder Head

The cylinder head and camshaft mount is one joined component and is
identical for the Cayenne S and Cayenne Turbo.

Technical Data, Valve Drive

Intake valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38.3mm
Intake valve lift, large . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.0mm
Intake valve lift, small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.6mm
Exhaust valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . .33.0mm
Exhaust valve lift, cyl. 3, 4, 5, 7 . . . . . . . . . . . . . . . . . . . . . . .9.2mm
Exhaust valve lift, cyl. 1, 2, 6, 8 . . . . . . . . . . . . . . . . . . . . . . .8.0mm
Intake valve angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13.5°
Exhaust valve angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15.4°
Fuel injector installation angle . . . . . . . . . . . . . . . . . . . . . . . . . .29.0°
Camshaft bearing diameter . . . . . . . . . . . . . . . . . . . . . . . . .28.0mm
To ensure efficient gas exchange and valve lift control, the camshaft
mount is 9 mm higher on the intake side compared to the outlet side.
This arrangement meant that is was possible to optimize the intake
port. The cooling system was designed in such a way that high tempera-
ture parts are optimally cooled. The cylinder head is made of AlSi7Mg.
Engine – Cayenne V8
Cylinder head water jacket.
Combustion chamber stress area.
1 - Exhaust side
2 - Intake side
3 - Operating plunger
4 - Outlet valve tappet
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