What is the effect of insulation blankets on engine performance?

• A. Decrease engine efficiency.
• B. Increase emissions.
• C. Improve engine performance by reducing heat loss.
• D. Increase engine weight for no reason.

Answer: (C)

Insulation blankets are used to minimize heat loss from hot engine parts, keeping more of the engine’s heat inside the system. By reducing heat transfer to the surrounding environment, the engine runs closer to its designed operating temperature with less energy wasted as heat. This improves thermal efficiency and overall engine performance, and can also help lower fuel consumption because less energy is spent compensating for thermal losses. They also protect nearby components from excessive heat. So the effect is an improvement in engine performance by reducing heat loss. The other options don’t fit: insulation doesn’t decrease efficiency, isn’t intended to increase emissions, and while it adds some weight, that isn’t the purpose or primary effect.