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Class 4 (4th Engineer) MEKM 📅 Sep 2022

Exam Question

(a) Describe with a simple sketch the arrangement of exhaust and air inlet passages in a medium speed four-stroke engine cylinder head. (6)

(b) With respect to (a) indicate where cracking might be expected stating the likely cause. (5)

(c) Explain the different factors that tend to cause distortion of four stroke cylinder heads. (5)

Exam question diagram

Reference Answer

### (a) Arrangement of Exhaust and Air Inlet Passages
A medium-speed, four-stroke engine cylinder head is a complex casting designed to accommodate gas exchange, fuel injection, and cooling. The arrangement of passages is critical for engine performance and reliability.
**Common Arrangement (Single Inlet/Exhaust):**
* **Valves:** Typically, one large-diameter air inlet valve and one exhaust valve are provided per cylinder. The exhaust valve is made of a higher-grade, heat-resistant material (e.g., Nimonic alloy or Stellite-faced) than the inlet valve.

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