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Engine Management

Cylinder Head 1 - Generally
Cylinder Head 2 - Add. Inf.
Cylinder Head 3 - Design
Cylinder Head 4 - Cross Flow
Cylinder Head 5 - Top
Cylinder Head 6 - Underside
Cylinder Head 7 - Hydraulic Tappets
Cylinder Head 8 - Four-Valve
Cylinder Head 9 - Five-Valve
Cylinder Head 10 - Skimming
Cylinder Head 11- Processing
Cylinder Head 12 - Repair
Cylinder Head 13 - Gasket

Exchange of Gases
Comb. Chamber Shape
Cam
Camshaft
Adjustable Camshaft 1
Adjustable Camshaft 2
Adjustable Camshaft 3
Cambelt
Cambelt (assembly)
Camshaft Timing Chain
Camshaft Timing Chain
Upright Shaft
Timing Diagram
Valves
Valve drive
Natrium Cooled Valve
Valve Spring
Valve Stem Guide
Valve Seat
Valve Seat Angle
Valve Stem Sealing
Valve Overlap
Valve Play Adjustment
Valve Contr. (desmo.)
Hydraulic Lifter
Operating Valves
Var. Valve Timing 1
Var. Valve Timing 2
Var. Valve Lift 1
Var. Valve Lift 2
Drawrod Engine

Engine Control 1
Engine Control 2


















Cylinder head 9 - Five-valve



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Function

There has been in the vehicle history only one piston-stroke engine featuring more than five valves sensibly. However, it was so complicated that it disappeared again after a short while. The engine had oval pistons and therefore enough space in the cylinder head. This is different for the one illustrated on top.

There are differences in the interpretation of whether the expenditure pays off. The manufacturer claims advantages for the performance provision and the mileage. Testers have difficulties to track this.

How it works

Because the intake is more difficult than the exhaust, the solution is to design the inlet side a little bigger than the outlet side. In this case they simply take three intake valves and two exhaust valves. So far so well, but how to control all these valves? You take exactly like with four valves double overhead camshafts, keeping the same separation of inlet and outlet. If you take a close look at the intake valves on the (enlarged) picture, you will recognise for the lower ones a different work angle because it must also reach the common camshaft.

Unfortunately, there is hardly a future for the aesthetic beauty of this cylinder head. The petrol direct fuel injection system is claiming space. An injector must fit into the cylinder head, thus the fifth valve disappears again. 06/08



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