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Calibration
- The Filter Minder® air filter service indicator measures vacuum in the air induction system in 'inches of water vacuum'.
- The Filter Minder® is calibrated per engine or vehicle manufacturer's recommendations.
- Most diesel engines operate at a maximum 20 to 25 inches water vacuum under full load.
- Gasoline engine calibrations can vary depending on the engine size and air cleaner design. Small gas engines (2-5 HP) should usually limit restriction to 3 inches maximum, 6-25 HP should limit filter restriction to 8" maximum, and most gasoline engine powered automobiles 20 inches maximum. Some vehicles with the Filter Minder® as standard equipment may use a higher calibration than the above guidelines. If in doubt, contact Engineered Products Company for recommendations.
- Diesel suction fuel filters are usually monitored in inches of mercury. The maximum restriction is typically 10-12 inches of mercury.
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