In the illustrated polar timing diagram for...

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Question 1 of 205eccefa1bacbc34ba4d473d6

In the illustrated polar timing diagram for a four-stroke cycle diesel engine, relative to crank degrees of travel with respect TDC or BDC as appropriate, when does the intake valve open? See illustration MO-0084.

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🔍 Key Concepts

• Four-stroke diesel cycle events and which stroke the intake valve is open • How to read a polar timing diagram (direction of rotation and where TDC/BDC are marked) • Difference between valve opening before/after TDC or BDC and how that’s shown as an angle on the diagram

💭 Think About

• On which stroke of the four-stroke cycle does the intake valve start to open, and is that closer to TDC or BDC? • Looking carefully at the intake-valve band on the diagram, at what crank angle (relative to TDC/BDC) does the colored arc first appear as you follow the arrow of rotation? • Compare the starting point of the intake-valve arc to the labeled angle marks (75°, 85°, 45°, 55°). Which label lines up with the very first opening point of the intake valve?

✅ Before You Answer

• Be certain you have correctly identified the intake valve arc (not exhaust or fuel injection) on the diagram. • Double-check the direction of rotation arrow so you are reading the timing in the correct order around the circle. • Verify whether the angle label you choose is referenced to TDC or BDC, and whether it is before or after that crank position.

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