The Valve Train Camshafts Rocker Arms and Push

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The Valve Train Camshafts, Rocker Arms and Push Rods Presented By- David Smith

The Valve Train Camshafts, Rocker Arms and Push Rods Presented By- David Smith

Objective To familiarize the audience with the purpose and uses of: l l The

Objective To familiarize the audience with the purpose and uses of: l l The valve train The pushrod system Alternatives to the pushrod system New developments in the valve train world

Role of the Valve Train l l l Times the opening and closing of

Role of the Valve Train l l l Times the opening and closing of the cylinder valves Ensures opening and closing is kept in sync Necessary for any combustion engine

Components of the Valve Train (Pushrod System) Rocker Arm Camshaft Head Springs Valve Cylinder

Components of the Valve Train (Pushrod System) Rocker Arm Camshaft Head Springs Valve Cylinder Pushrod http: //www. oregoncamshaft. com

Overhead Cam Systems l l l Positions the camshaft in the head(s) Single overhead

Overhead Cam Systems l l l Positions the camshaft in the head(s) Single overhead cams (SOHC) are found in inline cylinder engines Dual overhead cams (DOHC) are found in Vcylinder type engines

Advantages/ Disadvantages of the overhead cam system l l l Creates the possibility for

Advantages/ Disadvantages of the overhead cam system l l l Creates the possibility for more fuel or exhaust valves More valves = More flow Like pushrod systems, will only be 100% efficient at a specific RPM.

New Technologies l Honda’s VTEC (variable valve timing and lift electronic controls) l l

New Technologies l Honda’s VTEC (variable valve timing and lift electronic controls) l l l Lobes can be enabled/ disabled at different RPM’s Allows for variable timing creates more low and high end RPM power

New Technologies cont. l Ferrari’s VVT System (variable valve timing) l l Uses 3

New Technologies cont. l Ferrari’s VVT System (variable valve timing) l l Uses 3 D lobes Aggressive lobe profile at one end, opposite lobe profile at the other Blended together in the center to form a varying lobe shape Camshaft moved in and out depending on the RPM

Ferrari’s VVT system Camshaft Moves Laterally Varying Lobe Design

Ferrari’s VVT system Camshaft Moves Laterally Varying Lobe Design

Conclusion By explaining the components and different types of camshafts that go into a

Conclusion By explaining the components and different types of camshafts that go into a valve train, you now have a more profound under standing of the system and the combustion engine as a whole

References l http: //www. streetracersonline. com http: //www. oregoncamshaft. com http: //www. hotrodder. com

References l http: //www. streetracersonline. com http: //www. oregoncamshaft. com http: //www. hotrodder. com l http: //auto. howstuffworks. com l l “If cylinder heads are the heart of an engine, then the camshaft and valve train have to be the brains of the operation. ” -www. streetracersonline. com