🔍 Key Concepts

• For a four-stroke diesel engine, one full cycle for each cylinder takes 720° of crankshaft rotation • In a multi-cylinder engine, the crank angle between firing events is related to 720° divided by the number of cylinders (for 4‑stroke) or 360° divided by the number of cylinders (for 2‑stroke) • The illustration shows relative cam (injection) positions for cylinders 1–6; these indicate the order and spacing of firing events

💭 Think About

• From the caption, decide whether this is a two-stroke or four-stroke diesel and how many degrees of crank rotation are in one complete cycle per cylinder • Once you know the total degrees per cycle, divide by the number of cylinders to find how many crank degrees elapse between successive firings if they are evenly spaced • Use the degree values under each cylinder in the illustration to confirm that the firing events repeat at a constant interval as the crankshaft turns

✅ Before You Answer

• Verify whether the engine is operating on a four-stroke cycle (720°) or two-stroke cycle (360°) before computing • Double-check that you are counting between firing events in the firing order, not the physical angular spacing between particular crank throws • Confirm that your computed interval actually matches the differences in crank angles shown beneath the cylinders in the chart (modulo 360°)