Engine Valve Train Jeff Barker. Valve Train Parts of an engine that move the valves.

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Presentation transcript:

Engine Valve Train Jeff Barker

Valve Train Parts of an engine that move the valves

How do the Valves move? Camshaft rotates at the same speed as the crankshaft. Lobes on the camshaft push up rockers as the shaft rotates Rockers push down and open valves

Pushrod Valve Train Camshaft located inside the engine Rocker arm connected to the camshaft by a pushrod. More weight Smaller engine

Single OverHead Cam Camshaft is on top of the cylinder in direct contact with the rocker arm

Double OverHead Cam Two camshafts instead of one on top of a row of cylinders Four camshafts in a V-engine Produces more power with additional valves Centered spark plug Larger engine, more parts to maintain

Future valve trains Pneumatic valve train – used in Formula 1 engines to reach 17,000 rpm Springs are replaced by pressurized air Computer controlled valves?

Sources abbysenior.com/mechanics/valve.htm bin/Exp_Image.cgi?img_src=images/VTrain99/R RockHead2.jpghttp:// bin/Exp_Image.cgi?img_src=images/VTrain99/R RockHead2.jpg m/adj22.jpghttp:// m/adj22.jpg