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what are the two main valve operations that are altered during modern variable valve timing systems?

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter12: Upper End Theory And Service

Section: Chapter Questions

Problem 1RQ: Explain staged and continuously variable value timing systems.

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what are the two main valve operations that are altered during modern variable valve timing systems?

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2- Draw theoretical valve timing diagram and compare it with actual one