on a jeep 4.0 the intake manifold gets as hot as header they are so close, shield it? - Fuelly Forums

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Old 10-10-2008, 07:59 AM   #1
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on a jeep 4.0 the intake manifold gets as hot as header they are so close, shield it?

Not sure if anyone has seen a straight six on a 4.0 jeep but on my 95 i have no heat shields on the ehuast aftermarket header or on the bottom of the intake manifold. i know the hotter the motor usually the better fe. But this thing really gets a lot of heat soak would you do a thermal wrap on the bottom of the intake? I was going to wrap the header but nixed that idea and dont want to ruin them by rotting out so what about the intake? i have a WAI already getting warm air off the header just curious if intake is getting wayy to hot or is it a good thing. It has to come off this weekend anyway to replace gasket and ceramic coat the header.

thanks guys, photo below of how close they are

http://images.4wheeloffroad.com/tech...e_manifold.jpg
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Old 10-11-2008, 06:20 PM   #2
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so what do you think keep the intake manifold cool or let it get as hot as the header? what is best for fe
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Old 10-11-2008, 07:09 PM   #3
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Are we discussing the temperature after you parked it, engine off for a while?
Or, is the manifold hot as you are driving? If so, what is the temperature?


I sound snide, but the idea is to create a learning opportunity here with my sometimes inane sounding questions.

Yes. The colder the air the denser, ergo, the more Oxygen, hence the more fire&power, etc.
Your problem is to figure how to accomplish the above within the constraints of practality.

Back to the top, air flow cools the intake as the engine runs.
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Old 10-11-2008, 08:06 PM   #4
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i know its okay.

Yes the intake manifold get as hot as the header does becuase they a 1 inch apart. this while i am driving ive checked temeratures right after shut down and they are a smidge off but still the intake is extremley hit, cant hold hand on it.

so if i build a heat blocker onto the bottom of the intake would that help my FE thanks my questions thanks for responding
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Old 10-12-2008, 12:10 AM   #5
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My real world Jeep experience goes back to the Flathead and F-Head engines. As I recall there was some kind of heat shielding.

I would guess that insulating the entire intake wouldn't hurt and might actually show.........something. Keep super accurate gas mileage (or dyno) records and let us know the results.
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