What myth? They work, plain and simple. No "scientific measuring", but before I did my vents (very similar to the OP's style) I was regularly hitting 210 in stop and go traffic. Since doing the vents, I rarely hit 210. When I'm at a stop, I can see heat waves coming through the vents, so yes, they do help heat escape.

 

It helps with heat soak. The ambient temps in the engine will saturate everything in there including your cooling system parts. you get those engine bay temps down and it makes it easier for your cooling system to do its job essentially lower operating temp due to not having to contend with the higher engine bay temps.

 

I like it. Even though summer is almost over I still plan on cutting in some hood vents. My engine temp always gets up to 210+ in traffic and on street driving.

Nice job!!!

 

Very nice +1 on hood vents instead of hood spacers.

 

^lol at this comment. Stop going to him/them.

They're not there to lower his engine operating temperature, they are there to help evacuate hot air in the engine bay. Your radiator uses air flowing over its tubes to reduce the water temperature, so this effectively cools the operating environment which will help the efficiency of your radiator. Your thermostat still regulates the operating temperature of the engine.

 

Lol some people will believe anything

 

Not to hijack but you think the massive hood vent from and H1 would look good??

 

lol im actually in the process of making one. i looked at the hood vent on one of hmmwv's at my battalion and i think the might curve too much. but i am building one and i will post a build thread when im done. and i think it will look sweet!

 

Oh awesome!! maybe I can come up on a desert tan hood vent from my unit can't wait for pics bro!!

 

And it's made of aluminum so it might be able to bend just enough to work on an xj....

 

Here is the setup that I did. Believe me it helps. Specially here in Az. in stop and go traffic and when your on the trail crawling. Probly the best and cheapest project i have done.

Well desided to start a new project. The jeep has been over heating so I bought a new radiator. Also desided to put hood louvers in. I made my own because I couldn't find any I liked.Here are a few pictures of the prosses.
The hood before I began.



After finding the center points and drilling the holes.




I was thinking about putting the vents on top and trying to figure out what color I liked.


Took a 1.5 inch hole saw to cut the corners. Wanted them to look clean instead of sharp edges.



The hood after I cut the hole. Just used a metel cutting wheel on my grinder for this.



A look a the vents and the size.



And the aftermath. I desided to go with yellow.




Desided to paint the sliders to match.



The hole thing cost me about $40.00 with stainless steel bolts in the hood, paint metal and molding.

 

Very nice!!! Sliders look good matched

 

well its no longer this color. The jeep is now desert tan and everything else is black rhino lined.

 

I was thinking about doing this too. I already have the stuff, but the XJ body line down the hood is whats slowing me down.

 

I was seeing that could pose a problem. You could either try to flatten it where needed or use a thick 3M gasket around the frame to seal the gap.

I'd probably just use a thicker gasket. Trying to flatten it may cause the paint to crack.