According to Technician B's recommendation, at what H2O range should air filters be replaced for turbocharged engines?

According to Technician B's recommendation, at what H2O range should air filters be replaced for turbocharged engines?

• A. 20-25 inches
• B. 10-15 inches
• C. 5-10 inches
• D. 15-20 inches

Answer: (B)

The idea being tested is how a technician uses a differential pressure reading across the air filter to determine replacement timing, especially in turbocharged engines where airflow resistance can impact performance under boost. When you measure the pressure drop with a manometer, a mid-range differential—around ten to fifteen inches of water—best indicates the filter has become sufficiently dirty to impede airflow but isn’t so clogged that replacement is urgent. This threshold helps maintain clean, unrestricted intake air while avoiding replacing a filter too early. If the reading climbs well above that mid-range, the filter is too restricted and should be changed to restore proper airflow and turbo efficiency. If the reading stays well below, the filter can remain in service longer until it approaches the mid-range. In turbocharged applications, keeping airflow unimpeded is crucial for maintaining performance, so this mid-range replacement point aligns with balancing efficiency and durability.

The idea being tested is how a technician uses a differential pressure reading across the air filter to determine replacement timing, especially in turbocharged engines where airflow resistance can impact performance under boost. When you measure the pressure drop with a manometer, a mid-range differential—around ten to fifteen inches of water—best indicates the filter has become sufficiently dirty to impede airflow but isn’t so clogged that replacement is urgent. This threshold helps maintain clean, unrestricted intake air while avoiding replacing a filter too early. If the reading climbs well above that mid-range, the filter is too restricted and should be changed to restore proper airflow and turbo efficiency. If the reading stays well below, the filter can remain in service longer until it approaches the mid-range. In turbocharged applications, keeping airflow unimpeded is crucial for maintaining performance, so this mid-range replacement point aligns with balancing efficiency and durability.