Wrangler Hood Vents - JeepForum.com
 
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post #1 of 2 Old 04-24-2014, 03:18 PM Thread Starter
schitzangiggles
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1993 YJ Wrangler 
 
Join Date: May 2005
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Wrangler Hood Vents

Wrangler Hood Vents

If you have high temps under hood, live in the desert where it gets hot or you spend a great deal of time idling while wheeling, or simply like the look of some real hood vents, keep reading.

My 93 YJ has the 4.0 I6 that gets pretty warm while idling around while rock crawling and never had the budget to add in an auxiliary electric fan so I looked at other options to aid in letting out the heat. Like many I went back and forth about cutting up my hood and the thought of having to reinforce my hood and mod a bunch of stuff just didn't appeal to me.

Lo and behold one day while perusing the isles of my local Army surplus store I found these http://www.armysurpluswarehouse.com/...hood-vent.html

I thought well it is cheaper than anything else I have found and they are BEEFY. Solid 3/16th aluminum and genuine military surplus, what more could you ask for. So 2 of these Forrest Green beauties followed me home.
I whipped out my can of Aervoe 977 Flat Sand and painted them real quick and that is when I realize they are the same side. No worries cross flow ventilation. The curve of the vent and that of the hood is just a wee bit different, but I figured that when the hood gets cut and the vent bolted down that it will work just fine. So I place the vents on the hood and moved them around until I found what I liked the looks of the best. If you have shiny paint or paint you care about, you will want to use blue painters tape (the good 3M stuff not the crappy chicom garbage) to protect your paint from chipping and scratching from the base of the jigsaw when you make your cut. Go past the area you want cut out @ 8-10” so you don’t mar the paint, tape is cheap. I then marked the holes with a pencil. After I pulled the vent back off I measured in from the edge of the hole to get the mark for my cut out. This is the point you want to make sure you aren’t going to cut into any hood brackets of stiffeners, so measure a rough idea where it is going to be underneath to keep everything how it needs BEFORE you start cutting. My year was OK for my location, but you need to check YOUR PATICILAR location/year.
At the corners I used a big washer to get a radius that I liked because a square corner will create a stress riser that will lead to a crack developing later. So I measure it off for both sides and I used a 100ft flexible tape as a straight edge so I can have a clean line coming down over the curve on the hood.
The next step can be a bit intimidating because up until now, this is simply a “Theoretical Exercise” with pencil marks. I use a unibit to drill into the corner to give me a place to begin my cut with my jigsaw and it makes it easy to enlarge the hole if you need more room. Big tip: USE A NEW BLADE and GO SLOW. You can take away material easier than you can put it back. Start off in one direction, again, go slow. The corners are the hardest part as you may have to back up and move forward, widening the “kerf” to get some room to make the turn. So again, use a sharp blade and you can make the turn easier and cleaner. As you near the completion of the cut out the metal cut so far will start to vibrate really bad, so I used a screw driver to hold the opposite side up and make for a clean cut. Hit the cut edges with a quality primer to avoid rusting issues. Now take your hardware cloth and using the cut out as a template, cut it an inch or so larger than the cut out all the way around to keep out debris and look cool.

When you are done cutting out for the vent, use the file to get rid of the burrs that happen when you cut the sheet metal. I placed the vent back over the cutout and marked the holes for the bolts. Don’t use the ones you did for the lay out as the vent grills will not allow the vent to lay snug/flat against the hood. By laying it flat against the hood and remarking the holes, you will have the most accuracy possible. BTW the vent doesn't have all of the holes drilled into it that are needed to really get it snug which is fine because you will need to eyeball the curvature and drill holes in the right location to hold everything nice and flush. Use the existing hole to hold the vent in place with bolts so it doesn't move while you drill the new holes. After all of the holes are drilled hit everything with primer/paint BEFORE you put in the bolts. Once you have all of the holes in place and bolts ready you can begin to install them through the hardware cloth to secure it in place. I used a 1 ” x ” fender washer and ”x 1" grade 3 bolts with nylock nuts to keep everything secure.

Do not over tighten the vent as it can cause the vent to crack. Now you can paint everything to match or simply paint it however you want. I prefer it to match the body color. But it is your rig; make it look how you want.

Now to the good stuff, my under hood temps dropped enough that it doesn’t burn you when you touch the hood after it has idled for a while and it looks really great. Also these particular vents are strong enough that they actually INCREASE the rigidity of the hood, especially if you have “hi-lined” it like I have. Unlike the plastic kits you find elsewhere that have as much spine as a politician in an election year, these are stout and I am into this set up less than $30.


Materials list:
2) http://www.armysurpluswarehouse.com/...hood-vent.html
22) ” x 1” hex head bolts.
22) 1 x ” fender washers.
22) Nylock nuts
22) ” flat washers (between the bolt head and vent)
1 roll of heavy duty ”x ” hardware cloth
Primer and desired final color spray paint.
Painters tape.

Tool list:
Unibit drill bit
Jigsaw with new metal cutting blade.
” drill bit
Tin snips to cut hardware cloth
Appropriate sized wrench and sockets (IIRC 7/16th”) for bolts.
Tape measure

File to take off burrs on cut.


Here are the pics
http://s8.photobucket.com/user/schit...?sort=3&page=1

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If you love wealth more than liberty,the tranquility of servitude more than the animating contest of freedom, go home from us in peace. We seek not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains sit lightly on your shoulders and may posterity forget that you were our countrymen.
-Samual Adams

A government big enough to give you everything you want is big enough to take everything you have.
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"Your right, the Tea Party and the OWS are the same, just like the America Revolution and the French Revolution were the same. The only problem is the American Revolution ended with Liberty, Freedom, Justice for all and a shining light upon a hill. The French Revolution ended with lynchings, guillotines, murder and socialism. So yeah, I could see how one could confuse the two..."

Mac Wilson
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post #2 of 2 Old 04-24-2014, 03:25 PM Thread Starter
schitzangiggles
King of Macastan
 
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1993 YJ Wrangler 
 
Join Date: May 2005
Location: Rigby, Idaho
Posts: 6,173
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"Axeheads are supposed to be sharp, but you are one blunt tool."
FLynes



If you love wealth more than liberty,the tranquility of servitude more than the animating contest of freedom, go home from us in peace. We seek not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains sit lightly on your shoulders and may posterity forget that you were our countrymen.
-Samual Adams

A government big enough to give you everything you want is big enough to take everything you have.
Thomas Jefferson

Calling Illegal Aliens "Undocumented Immigrants" is like calling drug dealers "Unlicensed Pharmacists"

Nemo Me Impune Lacessit
"No one provokes (attacks) me with impunity".


"Your right, the Tea Party and the OWS are the same, just like the America Revolution and the French Revolution were the same. The only problem is the American Revolution ended with Liberty, Freedom, Justice for all and a shining light upon a hill. The French Revolution ended with lynchings, guillotines, murder and socialism. So yeah, I could see how one could confuse the two..."

Mac Wilson
schitzangiggles is offline  
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