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Video Multi-cylinder Engine
Video Inl. 2-cyl. 4-stroke
Video Inl. 2-cyl. 2-stroke
Video Opp. 2-cylinder
Video 2-cyl. V-engine
Video Inl. 3-cylinder
Video Inl. 4-cylinder
Video Opp. 4-cyl. 1
Video Opp. 4-cyl. 2
Video Inl. 5-cylinder
Video 5-cyl. V-Engine
Video Inl. 6-cylinder
Video 6-cyl. V-inline-engine
Video 6-cyl. V-engine
Video Opp. 6-cylinder
Video 8-cyl. Firing Order
Video 8-cyl. V-engine
Video 8-cyl.-V-Classic
Video V-8 Cylinder Block
Video V8 Turbo Engine
Video W-8 Cylinder Block
Video V-10 Cylinder Block
Video V-10 Diesel Engine
Video V-10 Porsche Engine
Video V-12 Engine
Video V-12 Cylinder Block
Video V-12 Ferrari Engine
Video W-12 Cylinder Block
Video W-12 Engine
Video Radial Engine
Video Rotary Radial Engine

Video Multi-cylinder 1
Video Multi-cylinder 2

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Timing Diagram


The timing diagram points out in degree crank angle, when exactly the intake valves and exhaust valves open and close.

How it works

Analysing the valve timing diagram it is possible to get a clear insight into the engine characteristic. An engine which reaches its highest torque and its highest performance at relatively low revs, the inlet valve opening, inlet valve closing, outlet valve opening and outlet valve closing are positioned near to the TDC or BDC:

Petrol engineDiesel engine
Inlet openmax. 40 b. TDCmax. 30 b. TDC
Inlet closemax. 60 a. BDCmax. 60 a. BDC
Outlet openmax. 60 b. BDCmax. 30 b. BDC
Outlet closemax. 40 a. TDCmax. 30 a. TDC

Very sporty engines or even racing engines feature clearly higher values. The valves are kept open for a longer period of time, the valve overlap between inlet valve opening and outlet valve closing is bigger. Modern engines feature a camshaft adjustment. In this case only areas for inlet/outlet valve opening/closing can be defined. The valve timing diagram becomes less important. 06/08               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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