I would recommend taking it off.. That way you don't worry about metal shavings getting into anything you don't want them in.. Hardest part was to actually start cutting the hood.. I do recommend painting all the holes you cut.. No matter where you live.. IT will rust if you don't..
Def take the hood off. It only takes minutes to remove anyways. Be careful tightening the hardware they provide. I've installed several of these and the tiny bolts tend to strip or break. They provide some extras but on the last install I did we used every single extra.
Yeah, for sure remove the hood. All posts above are right about everything. My wife flipped out when she saw me cutting it up, but she was ok with the finished job. And yes it does let heat out, can see the heat waves coming out in the winter, rain and snow no problems.
I've read in other posts that it is not really effective in reducing engine temperature at all, just the air under the hood. Any opinions here? I don't want to cut my hood up if it won't provide a tangible benefit.
2001 3" lift 31" rubber 4.0L auto "Under Construction"
I didn't remove the hood when I installed hood louvers. I put a plastic tarp over the engine bay to keep the filings out.
Rain water doesn't affect me at all, whether parked or not. I've heard some folks even purposely spray water on their engines to wash them.
And yes, the engine coolant system still maintains the ideal 210F on mine. That's wasn't my intention since I don't have an overheating cooling system. But my underhood temps have fallen significantly, which I'll bet does some good to the operating computers, fuel system, hoses, belts and whatever else doesn't like excessive heat, and me too since I can now lift my hood without gloves on.
I'll add this. I have noticed that my underhood temps are less. The hood is cool to the touch, but more importantly I have noticed that my oil pressure no longer drops to zero after installing. I bought a Mopar sending unit, and it helped except for long drives at constant speeds, where it would drop to zero coming to rest at stop signs or traffic signals. Since the install my pressure stays constant.
I also removed the hood and placed on saw horses. I removed and installed the hood by myself, and I believe the install took about 1.5 hours start to finish. I did not time it....
I did mine a couple weeks ago. Make sure you have a good hole saw with a longer guide bit than normal, After cutting all 20 holes I just used a soap stone and a straight edge to mark my cuts. I used a jig saw and used my fingers to keep the saw off the hood surface to minimize vibrating. I did put touch up paint on the large holes, bit not the bolt holes.
BTW- I figured this was a good time to mount my jack on the hood at the same time.
I installed mine right after I started this thread.
I installed it per the instructions that came with it.
I removed the hood by myself and cut it sitting on the garage floor.
Super simple install and the hardest part was the first cut one a nice shiny clean hood.
I do notice a lot of heat radiating out the hood louvers. I have not noticed any drop in engine temps and I am not sure this is what it was designed for. I would guess it is more designed for venting the hot air in the engine compartment.
I do notice that my air compressor (under the hood) is not too hot to touch anymore and the other components under the hood feel cooler (still warm but not HOT). It would appear the hood louver is allowing the heat that is built up by the engine to escape out the hood louvers.
We do not have a lot of rain out here but the engines are designed to be able to get wet. In fact, every time I get home from offroading I throw up the hood and hose off the entire engine (cold engine, not hot). Been doing this for years with no problems.
I am glad I did the hood louver and have noticed no ill side effects.
Not a hard install, once you get over the fact your cutting a perfectly good hood.
This is the gospel right here. Making your first cut, be it hood or fenders is one of the most nervous moments in your Jeeping life. Just keep in mind that if you botch it completely, it's only $125 for a new hood to try again, and maybe $50 to have it painted.
One thing I have heard about this mod is to not cut the hood over the serpentine belt. Once you cut the hood over the serpentine belt and it rains over night, I live in Oregon, it will make the belts sequel due to being wet. I leave for work at 4:30am, I would have death threats fairly quickly from my neighbors.