When the normal compression ratio of a...

Question 1 / 270705eccefa3bacbc34ba4d47de0

Question 1 of 270705eccefa3bacbc34ba4d47de0

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by __________.

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Question 1 of 27070

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by __________.

🔍 Key Concepts

• Diesel combustion requirements: temperature, pressure, and air-fuel mixture for self‑ignition • Effect of compression ratio on temperature at the end of the compression stroke • How cooling and valve operation/clearance affect cylinder temperature and compression pressure

💭 Think About

• If the compression ratio is already on the low side, what engine condition would further reduce the final air temperature in the cylinder at light loads? • Which options would tend to make ignition easier (higher temperature/pressure) versus harder (lower temperature/pressure)? • At light loads, how is the amount of heat generated in the cylinder different from full load, and which condition would have the biggest impact on causing misfire?

✅ Before You Answer

• Identify which choice would lower the air temperature at the end of compression when the load is light • Eliminate any options that would normally tend to increase cylinder pressure and temperature • Think about which condition would be most critical when the compression ratio is already not very high (marginal for ignition)

Question 1 of 27070

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by __________.

overloading the engine

low exhaust valve lift

excessive cylinder cooling

insufficient mechanical clearance

Question 1 / 270705eccefa3bacbc34ba4d47de0

Question 1 of 270705eccefa3bacbc34ba4d47de0

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by __________.

Back

Question 1 of 27070

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by __________.