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Video Engine Management

Video Cylinder Head 1
Video Cylinder Head 2
Video Cylinder Head 3
Video Cylinder Head 4
Video Cylinder Head 5
Video Cylinder Head 6
Video Cylinder Head 7
Video Cylinder Head 8
Video Cylinder Head 9
Video Cylinder Head 10
Video Cylinder Head Repair
Video Cylinder Head Gasket

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

Video Engine Control 1
Video Engine Control 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Combustion Chamber Shape


The shape of the combustion chamber is very important for the mixture formation and the combustion. Ideally, it would be spherically shaped with the spark plug in the center, from where the core of the flame would spread out evenly in all directions.


In the case of the Heron combustion chamber, the chamber is, in relation to the completely flat cylinder head, slightly sunken into the piston, here indicated in blue. Whereby, the edges of the piston can reach within less then 1 millimeter from the cylinder head, to achieve a swirling effect. The operation of either an overhead cam or one with pushrods and rocker arms is possible. The OHV (push rod) engine, seldom found in motor cars nowadays, mostly has the second, roof shaped combustion chamber. It is operated by push rods and rocker arms.
The third, and particularly the fourth combustion chamber shapes are far more up-to-date. Two valves in a roof-shaped arrangement were, for many years, the state-of-the-art. Especially sports-car engines were fitted with them (see picture 5). In this case, larger valve diameters, in contrast to flat cylinder heads (see picture 1), are possible. Four-valve engines (see picture 6), are nearly always combined with two overhead cams (DOHC). This shape comes pretty close to the ideal, however, when no valve lies parallel to the other, a more complicated control is also required. 10/11               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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