During main engine performance testing it is...

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Question 1 of 205eccefa3bacbc34ba4d47e0a

During main engine performance testing it is noticed that the firing pressure of one cylinder is higher than the average, but cylinder compression pressure is normal. Which of the following would most likely be the cause?

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🔍 Key Concepts

• Difference between compression pressure (with no fuel combustion) and firing pressure (after fuel ignition) • How fuel injection timing (early vs late) changes peak cylinder pressure and temperature • Typical effect of worn piston rings on compression readings

💭 Think About

• If compression pressure is normal but firing pressure is higher only in one cylinder, which part of the cycle is most likely different in that one cylinder? • How would early fuel injection change the pressure curve compared to late injection, assuming compression is unchanged? • Would high engine load usually affect one cylinder only, or all cylinders similarly?

✅ Before You Answer

• Confirm which faults would usually lower compression pressure rather than keep it normal • Think about whether engine load changes cylinder pressure in just one cylinder or across all cylinders • Match the option that affects primarily the combustion phase (after compression) rather than the compression phase itself

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