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Unread 07-03-2013, 01:58 PM   #31
Jeeper_YJ
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Quote:
Originally Posted by TheRealKTrain View Post
Hood vents are to help dissipate the heat being trapped under the hood, also known as heatsoak. IT WILL NOT REDUCE THE OPERATING TEMP OF THE MOTOR. That's a very common misconception around here.
Heat soak is when a motor reaches a certain temp and can no longer bring the temp back down?

I think my issue of "heat" is from header. Although, I think coolant temp is better now (with 3 row radiator) post #25. I would really like the hood temps brought down. That hood gets HOT!

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'97 Cherokee, 99+ intake, 62mm TB, 703 injectors (new), k&n intake, Hypertech III, 180* stat (1/8" drilled hole), 2.5" manifold 2 tail pipe (Hooker Maxflow & hi flow cat), Perf header, 4.5" zone lift, 32" GY Dura Trac, Rear head rests. Comp cam "231" & Perf head (LS1 BIG valves 2.02/1.62). 3 row alum radiator.
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Unread 07-03-2013, 02:03 PM   #32
TheRealKTrain
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http://www.oman4x4.com/hoodvents.htm

Well documented test.
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Unread 07-03-2013, 02:11 PM   #33
Jeeper_YJ
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Quote:
Originally Posted by TheRealKTrain View Post
Great link! Interesting the heat is more by the firewall. Probably from motor fan pushing it.
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'97 Cherokee, 99+ intake, 62mm TB, 703 injectors (new), k&n intake, Hypertech III, 180* stat (1/8" drilled hole), 2.5" manifold 2 tail pipe (Hooker Maxflow & hi flow cat), Perf header, 4.5" zone lift, 32" GY Dura Trac, Rear head rests. Comp cam "231" & Perf head (LS1 BIG valves 2.02/1.62). 3 row alum radiator.
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Unread 07-03-2013, 03:57 PM   #34
CJ7-Tim
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Hood vents do make a slight reduction in engine operating temperatures. The effect is most noticeable in stop-n-go traffic, and on the 4x4 trails, but also can be observed on the highway. I saw about a 5-8* drop in "normal" operating temps after I installed my hood vents.

The biggest misconception, is that hood vents can compensate for a weak or neglected cooling system. Regular routine maintenance is the only way to avoid overheating issues.
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Unread 07-03-2013, 04:00 PM   #35
cruiser54
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Quote:
Originally Posted by CJ7-Tim View Post
Scan Tools and OBD-II data readers are said to display temperature readings that are 10* less than what is indicated on the dashboard gage.

Since older XJ's have 2 temp sensors in different locations, a wider variation in temp readings would not surprise me.


195*-210* is normal for the 4.0L, and seeing 215-220* under extreme conditions is also normal.
I think the temp gauge on the 88 is inaccurate. Same scan tool on the 90 MJ shows straight up the gauge while 195 on the tool.
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