Engine Valve Train Jeff Barker. Valve Train Parts of an engine that move the valves.
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Transcript of Engine Valve Train Jeff Barker. Valve Train Parts of an engine that move the valves.
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
• http://auto.howstuffworks.com/camshaft1.htm • abbysenior.com/mechanics/valve.htm• http://www.swcp.com/mcs-bin/Exp_Image.cgi?
img_src=images/VTrain99/RRockHead2.jpg• http://en.wikipedia.org/wiki/Four-stroke_cycle• http://www.supercarsunlimited.com/info/tech/
stem/adj22.jpg