1 / 11

The Valve Train

The Valve Train. Camshafts, Rocker Arms and Push Rods. Presented By - David Smith. 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. Role of the Valve Train.

malise
Download Presentation

The Valve Train

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  8. New Technologies cont. • Ferrari’s 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. Ferrari’s 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.streetracersonline.com

More Related