So I tested temps under the hood. Conditions: 86F
Test 1 - Sitting in driveway in sun no fan on full engine temp
3FT from jeep outside temp - 86F
Intake area blocked off - 135F
Engine bay area 6in from intake area - 152F
Test 2 - Driving 25MPH with test lead in blocked off intake area
Intake area blocked off - 87-91F
Seems the barrier that comes with my K and N FIPK works. With zero airflow the difference is 17 degrees and while driving only 25MPH the temp is at or slightly above the outside air. Effective? Yessir!
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Fran:2002 Jeep Grand Cherokee Limited 4.7 quadra drive. 31in General Grabber AT2, OME HD, bilstein, IRO sway links, addco rear sway. Kolak 3in cat back flowmaster SUV 50, magnaflow 3in cat, airaid JR kit, ram air, P.I.E. aux adapter, surco 45x50, husky liners.
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=6&t=65276&p=719908#p719908