ULPOWER UL390i Installation Manual

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ULPOWER UL390i Installation Manual Manual pdf 35 page image

Installation Manual ULPOWER UL390i UL390iS 390iSAMI 390A01 Revision No: 3 Date: 2014-09-15 Page: 35 of 69Testing & evaluationFor new installations the pressure drop across both Ram air ducts must be checked. The following isa guide to evaluating an engine installation to see if it meets minimum cooling requirements.The easiest way to measure the air pressure drop across the engine and oil cooler is using a U tubemanometer. It is basically a piece of clear tube with a inner diameter of 6 mm bent into a “U” andhalf filled with water.For Cylinder head air pressure, connect one side of the tube to a static port inside the ram air duct,and the other side of the tube inside the cowl near the outlet.For the pressure drop across the oil cooler plumb one side of the tube against the front of thecooler and fix the other side of the tube inside the cowl near the outlet.For the cylinder head cooling and oil cooling there have to be a pressure fall of at least 20 mm. at120 km/h TAS.pressure fallNote: The tubes must be fitted in the same place each time to ensure you get consistentmeasurements.The change in air temperature is nearly the same as the change in CHT. If you do thistest at 10°C but sometimes you want to fly at 30°C your CHT will be 20°C higher.