The%20Valve%20Train - PowerPoint PPT Presentation

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The%20Valve%20Train

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The Valve Train. Camshafts, Rocker Arms and Push Rods. Presented By- David Smith. Objective ... Rocker Arm. Valve. Pushrod. Camshaft. Cylinder. Head. Springs ... – PowerPoint PPT presentation

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Title: The%20Valve%20Train


1
The Valve Train
  • Camshafts, Rocker Arms and Push Rods

Presented By- David Smith
2
Objective
  • To familiarize the audience with the purpose and
    uses of
  • The valve train
  • The pushrod system
  • Alternatives to the pushrod system
  • New developments in the valve train world

3
Role of the Valve Train
  • Times the opening and closing of the cylinder
    valves
  • Ensures opening and closing is kept in sync
  • Necessary for any combustion engine

4
Components of the Valve Train(Pushrod System)
Rocker Arm
Camshaft
Head
Springs
Valve
Cylinder
Pushrod
http//www.oregoncamshaft.com
5
Overhead Cam Systems
  • Positions the camshaft in the head(s)
  • Single overhead cams (SOHC) are found in inline
    cylinder engines
  • Dual overhead cams (DOHC) are found in
    V-cylinder type engines

6
Advantages/ Disadvantages of the overhead cam
system
  • 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.

7
New Technologies
  • Hondas VTEC (variable valve timing and lift
    electronic controls)
  • Lobes can be enabled/ disabled at different RPMs
  • Allows for variable timing
  • creates more low and high end RPM power

8
New Technologies cont.
  • Ferraris VVT System (variable valve timing)
  • Uses 3D 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

9
Ferraris VVT system
Camshaft Moves Laterally
Varying Lobe Design
10
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

11
References
  • http//www.streetracersonline.com
  • http//www.oregoncamshaft.com
  • http//www.hotrodder.com
  • http//auto.howstuffworks.com

If cylinder heads are the heart of an
engine, then the camshaft and valve train have to
be the brains of the operation. -www.streetrac
ersonline.com
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