A four-stroke eight cylinder in-line...

Question 1 of 2707066636eef28f7522a1c51fbce

A four-stroke eight cylinder in-line medium-speed diesel engine has a firing order of 1-5-2-6-8-4-7-3. If No.4 piston is at TDC and firing, how many degrees of crankshaft rotation will occur when No.5 piston reaches TDC and fires?

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Question 1 of 27070

🔍 Key Concepts

• Four-stroke cycle and how many crankshaft degrees are in one full cycle for a single cylinder • How many crankshaft degrees between firing events in an 8‑cylinder in-line engine • Using the firing order sequence to count how many steps separate cylinder 4 and cylinder 5 firing

💭 Think About

• First, recall how many crankshaft degrees are covered by one complete four-stroke cycle for a single cylinder. How does that relate to how often each cylinder fires in a multi‑cylinder engine? • In an 8‑cylinder engine, if the firing intervals are evenly spaced over the full engine cycle, how many degrees of crankshaft rotation occur between each firing event? • Looking at the firing order, how many firing intervals are there between No.4 firing and No.5 firing if No.4 has just fired at TDC?

✅ Before You Answer

• Confirm that a four-stroke engine requires 720 degrees of crankshaft rotation for a complete cycle for each cylinder • Divide the total cycle degrees by the number of cylinders to find degrees between firing events, assuming even spacing • Carefully count the number of firing intervals from No.4 to No.5 in the given firing order, moving in the correct direction through the sequence