Chapter 3 Ventilation system Section 1 Valve train 3.Timing Phase and Valve Clearance 3.1 Timing phase (a (b) (c) Figure 3.14 Valve timing phase diagram (a)intake phase (b)exhaust phase (c)timing phase 械电子工程学 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 3 Ventilation system 3. Timing Phase and Valve Clearance 3.1 Timing phase Figure 3.14 Valve timing phase diagram (a) intake phase (b) exhaust phase (c) timing phase Section 1 Valve train