Discussion
Which of the following would not reduce cold-start emissions?
Answer: D
Correct answer: Increasing the engine's compression ratio
Compression ratio is a fundamental engine parameter affecting efficiency and knock limits, and it does nothing to shorten the interval before the catalyst lights off. A higher ratio in fact extracts more energy from the gas, leaving the exhaust slightly cooler.
The other three all attack that interval directly: close-coupling puts the converter where the gas is hottest, electrical preheating warms it before the engine starts, and retarded ignition deliberately wastes energy into the exhaust to heat it faster.
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