Cowl Induction Hood

[Pookapotamus]

So I am trying to find a good looking cowl induction hood for my build, what are people running? I am not a fan of louvers, or just cutting some vent holes in a stock hood, want something that looks great and will help cool the stroker.

Does anyone have any suggestions? what are people running?

Pook

[Mudderoy]

So I am trying to find a good looking cowl induction hood for my build, what are people running? I am not a fan of louvers, or just cutting some vent holes in a stock hood, want something that looks great and will help cool the stroker.

Does anyone have any suggestions? what are people running?

Pook

Have a look at this :link: (http://www.xjtalk.com/showthread.php?t=1235&highlight=cowl+induction+hood). As far as I know no one else has done a cowl induction scoop on xjtalk.

[LizardRunner]

http://www.stylintrucks.com/st/?PN=1104000126+4294860814&VN=4294967261+4294966246+4294966216+4294966602+429 4966877&Ns=P_PF_Rank_2%7c0&Ne=1104000000&N=0&Nu=P_PF_Code_2&refType= Product Fit&refValue=Universal

http://www.jegs.com/p/Harwood/Harwood-Fiberglass-Cowl-Induction-Hood-Scoops/746053/10002/-1

http://www.rodnrace.com/c4/Fiberglass-Hood-Scoops-Vintage-Fiberglass-Car-Bodies-Cowl-Induction-Hood-Scoop.htm

There are three sites to get you started. There is always the option of actually making your own too. Things to consider are; metal or fiberglass or plastic, bolt on, glue on or rivit and filler, how high do you want it compared to how well you see over it. If you want to make your own in metal you need 20 ga. and body hammers. I will be happy to give you step by step instructions just give me a pm. When it comes to scoops your imagination and needs are the only limiting factors. If you use a metal one, you can weld it in place and keep the one piece hood look easier than if your using an add on, flanged type.

[Pookapotamus]

i made my own previously, i hate body work, and for the build i am doing i want something that looks good. :)

thanks for the links i will check them out.

[LizardRunner]

I've been looking at my own hood and it would not be hard to cut the original hood, lift it to the desired height then just stitch weld in two side panels to complete the induction hood scoop for a total custom, seamless scoop with the jeep hood detail still intact.

[One_Big_Midgett]

Im thinking about using one of these.

http://i.ebayimg.com/t/Fiberglass-Hood-Scoop-Chevy-Trucks-Turbo-Style-/00/s/NzY4WDEwMjQ=/$(KGrHqJ,!jIE6Io7E2HWBOpKkCmnRw~~60_12.JPG

http://www.ebay.com/itm/140661724268?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_500wt_1287

http://i.ebayimg.com/t/New-Fiberglass-4-Universal-Cowl-Hood-Scoop-/14/!Bp9!WvgBWk~$(KGrHqMOKisEuZLMURsgBLtlyfumnw~~_12.J PG

http://www.ebay.com/itm/New-Fiberglass-4-Universal-Cowl-Hood-Scoop-/270877623834?_trksid=p4340.m185&_trkparms=algo%3DSIC.NPJS%26its%3DI%26itu%3DUA%26o tn%3D5%26pmod%3D140661724861%26ps%3D63%26clkid%3D5 089680867201681148

[AZDoug]

I've been looking at my own hood and it would not be hard to cut the original hood, lift it to the desired height then just stitch weld in two side panels to complete the induction hood scoop for a total custom, seamless scoop with the jeep hood detail still intact.

This is what we're getting ready to do on the kids 85 XJ. Or you could carve one out of Styrofoam wrap it in Saran Wrap and hand lay some fiber glass and have a one off original.

[denverd1]

there's a guy on Jeep forum (Hess) that did a custom bump in the hood to accommodate a cold air intake underneath. a scoop would work a lot better..... He just cut out the spot he wanted to raise used a fabbed piece of steel. welded it in, filled it and painted. came out pretty good.

those custom hoods you linked to look good. the first looks trans am inspired. I'd personally find an old one and modify it fit so save coin. Either way, like a great idea. the forced induction CAI kits I've read about had great throttle response at speed. And I'm sure it would help with temps. good luck with the mod

[dagr8tim]

I've got a spare XJ hood, I had considered cutting the middle out and folding the edges to make a cowl that would weld to my existing hood.

Somebody used to make steel replacement hoods with a cowl, but they were like $500 and you can't find them anymore.

[julia1276]

I was not a fan of installing vents in my hood either. Instead of installing a cowl, I just spaced my hood. Added some washers where the hood mounts to the hinges and it was done. Looks very clean and is the same concept. Seems to help with the engine temp as well. I'm hoping to grab some longer bolts soon so i give it some more space. Only took a few a minutes to do. Just an idea.

[gary63]

they are stell out there the problem was for that price it should fit good but a guy I know got one and had to do alot of work and it. you have to transfore everything over and nothing fit and it didn't line up right.make you owne.

[Mudderoy]

they are stell out there the problem was for that price it should fit good but a guy I know got one and had to do alot of work and it. you have to transfore everything over and nothing fit and it didn't line up right.make you owne.

There is at least three different kind of Jeeps. The ones you off road in and really don't care about what it looks like. You want performance, cooling, etc... In my opinion that's the Jeep that you make your own cowl induction scoop for.

Then there is the daily driver that where performance and capability are wanted but not used on a regular basis. That's mine. I want my Jeep to look nice but still have that functionality that I can use anytime I wish. It's worth $100 for a fiberglass scoop and an hour of my time to cut and mount it. Now it will be hours more and several hundred more to bond the scoop to the hood etc... but I was able to get the benefit of the additional cooling almost immediately.

Lastly there is that show Jeep that isn't going to go off road unless you consider the car wash off road. These Jeeps need a custom hood in the $500 to $1000 range and professionally painted. If no hood is available you take your Jeep somewhere, leave it there a week and pick it up in time for the weekend.

[jonb8]

I built my own, here's a few pics in case you decide to go that way. I know you guy's love pics. :thumbsup:

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH012.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH013.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH015.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH016.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH017.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH024.jpg

[oderdene]

well done, thanks for sharing bro

[subsonic]

Well done!

That is a clean job.

[wolfsxj]

I built my own, here's a few pics in case you decide to go that way. I know you guy's love pics. :thumbsup:

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH024.jpg

I have an extra hood just layn around and have been thinking of doing this exact thing thanks for the pics. I think I'm going to have to do this one. Even if I mess it up or dont like it I dont have to use my hood on my rig. Man you have me thinking ha ha thats not always good cuz that always cost me time and money LOL

[dagr8tim]

I built my own, here's a few pics in case you decide to go that way. I know you guy's love pics. :thumbsup:

That's freaking awesome. Alot simpler than the way I was thinking of doing it.

Did you have to add any metal, or did you use the parts you cut out to make the sides of the cowl.

[LizardRunner]

Nicely Done!!

[Mudderoy]

Yeah it is nicely done. I've never seen anyone cut up their hood to make one that looked good. I'm sure it can be done, but that actually looks like it was pretty easy. Of course measuring correctly and cutting straight isn't always easy.

[msmoorenburg]

I built my own, here's a few pics in case you decide to go that way. I know you guy's love pics. :thumbsup:

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH012.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH013.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH015.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH016.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH017.jpg

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH024.jpg

Any shots from the drivers seat?

[jonb8]

I have an extra hood just layn around and have been thinking of doing this exact thing thanks for the pics. I think I'm going to have to do this one. Even if I mess it up or dont like it I dont have to use my hood on my rig. Man you have me thinking ha ha thats not always good cuz that always cost me time and money LOL

Go for it, just build templets and check everything twice before you weld it all up. Yes I did add extra metal, there's not enough cut out to cover. I didn't want a straight up and down cowl, and I wanted it to go with the lines of the hood so I angled everything, It was harder than a straight up and down cowl but well worth it in finished product. I don't have any pics from behind, and the hood went down the road on the SBC xj.

[dagr8tim]

Go for it, just build templets and check everything twice before you weld it all up. Yes I did add extra metal, there's not enough cut out to cover. I didn't want a straight up and down cowl, and I wanted it to go with the lines of the hood so I angled everything, It was harder than a straight up and down cowl but well worth it in finished product. I don't have any pics from behind, and the hood went down the road on the SBC xj.

Did you block off the cowl opening with anything? I had thought about using some expanded metal grating over the opening.

[jonb8]

I welded triangles in on the corners to help support the cowl, then in the middle I used a piece of aluminium I bought at Lowes. Look in the section with gas grills, it's used to lay over your existing grill and already has holes in it.

[dagr8tim]

I welded triangles in on the corners to help support the cowl, then in the middle I used a piece of aluminium I bought at Lowes. Look in the section with gas grills, it's used to lay over your existing grill and already has holes in it.

Nice. I've got a spare hood that's kinda crinkled on one side. Should be able to provide all the sheet metal of the right thickness and quality I need.

[oderdene]

I welded triangles in on the corners to help support the cowl, then in the middle I used a piece of aluminium I bought at Lowes. Look in the section with gas grills, it's used to lay over your existing grill and already has holes in it.

please post photos of this opening

[jonb8]

Sorry I didn't get any pics and I traded off the xj the hood was on. You can use anything you want in the middle, after you triangle the corners to support the hood and square off the opening it's just hanging something you like in the middle. Remember guy's the hood has an arc to it so your side pieces need to reflect that and can't be straight across. Once you get one just use it as a pattern, make 2 more and save the pattern for future hoods and your buddie's,,,,,:D

[BigC79]

looks great

[4x4Dalton]

Thats a great hood.Thanks for the pics and info.See a project in the future for me :D

[ArmyGuy45]

I built my own, here's a few pics in case you decide to go that way. I know you guy's love pics. :thumbsup:

http://i311.photobucket.com/albums/kk468/bainj11/SNAPFEESH024.jpg

With this hood it just lowers engine heat? Do you have your intake right under that cowl?

[XJ Wheeler]

With this hood it just lowers engine heat? Do you have your intake right under that cowl?

A hood like that is meant to draw the heat out from underhood.

[Carves]

A hood like that is meant to draw the heat out from underhood.


Thats the general belief ...

... but in reality it all works quite differently.

Parked and engine off ... heat will waft up and out ... as it will, no matter where holes are cut in the hood.

Parked/Slow driving under about 20mph ... Heat is forced out by the fans .... as it will, no matter where holes are cut in the hood.

At various speeds over about 20mph ... External air pressure prevents engine bay heat from getting out the gap ... or pushes in additional, unwanted air - affecting the normal engine bay airflow and radiator cooling.

A cowl hood is an induction hood ... designed to suck air in - to feed an airbox inlet.

... and a proper cowl hood has has two parts ... the top skin you see from the outside ... and underneath it has ducting to the air intake.

Auto accessory shops are only selling half a hood/cowl scoop ;) ... unless you get a truck masters design hood or one similiar.

Used "wrongly" ... half a cowl hood, can be a good thing for slow speed offroading ... as it does the same thing as flat mounted vents.
... but properly located vents still vent at slow speeds and also work at hiighway speeds.


Induction cowl hood benefits over vents ... ???
... increased, heat dissipation space, over the top of the engine,
... and better protection of engine bay components from rain/snow etc ... until the vehicle speeds are increased and it all gets sucked in anyway.


I always figured one of those reflexxion hoods ... correctly setup with an airbox connection only ..... and vents in the fenders would be a good allround setup.


Nice fab jab on yours jonb8

[XJ Wheeler]

Thats the general belief ...

... but in reality it all works quite differently.

Parked and engine off ... heat will waft up and out ... as it will, no matter where holes are cut in the hood.

Parked/Slow driving under about 20mph ... Heat is forced out by the fans .... as it will, no matter where holes are cut in the hood.

At various speeds over about 20mph ... External air pressure prevents engine bay heat from getting out the gap ... or pushes in additional, unwanted air - affecting the normal engine bay airflow and radiator cooling.

A cowl hood is an induction hood ... designed to suck air in - to feed an airbox inlet.

... and a proper cowl hood has has two parts ... the top skin you see from the outside ... and underneath it has ducting to the air intake.

Auto accessory shops are only selling half a hood/cowl scoop ;) ... unless you get a truck masters design hood or one similiar.

Used "wrongly" ... half a cowl hood, can be a good thing for slow speed offroading ... as it does the same thing as flat mounted vents.
... but properly located vents still vent at slow speeds and also work at hiighway speeds.


Induction cowl hood benefits over vents ... ???
... increased, heat dissipation space, over the top of the engine,
... and better protection of engine bay components from rain/snow etc ... until the vehicle speeds are increased and it all gets sucked in anyway.


I always figured one of those reflexxion hoods ... correctly setup with an airbox connection only ..... and vents in the fenders would be a good allround setup.


Nice fab jab on yours jonb8

So, wouldn't i still be right as his hood is the one piece design (as far as i know) you were talking about? Yes, my definition is more crude but i just assumed he was asking about Jons hood specifically.. :rolleye0012:

[Carves]

So, wouldn't i still be right as his hood is the one piece design (as far as i know) you were talking about? Yes, my definition is more crude but i just assumed he was asking about Jons hood specifically.. :rolleye0012:


Hey - its the internet ...

We are .... all .... right .. ;) .. :D


I figured you were referring to jonb8's ... thats why I was just trying to explain that they dont "draw" heat out.

Hot air ... naturally rises anyway ... any hole in the hood will allow it to escape ... until air pressures at the hole ... as dictated by the vehicle speed ... prevent it happening.


Cowl hoods are funny things ... They are an outlet vent at slow speeds ... and an inlet scoop at high speeds.

... which is not always a good thing - depending on your driving requirements.


If you want to "draw" hot air out ... the vehicle speed will need to be over about 20mph ... and vents used - located in a useful "slipstream" locations such as the leading edge of the hood ... or the fenders ...

Tis why I just have spaced hinges and a larger firewall seal between the hinges....
You can feel hot air wafting out from the rear corners of the hood when stopped ...
The little telltails popout when the fans kick in properly ... and
The little telltails pop out at highway speeds ... and I dont have to worry about whether cowl induction air is messing with radiator airflow or lowering engine bay temps too much - so that the fanclutch doesnt work properly when needed.

[XJ Wheeler]

Hey - its the internet ...

We are .... all .... right .. ;) .. :D


I figured you were referring to jonb8's ... thats why I was just trying to explain that they dont "draw" heat out.

Hot air ... naturally rises anyway ... any hole in the hood will allow it to escape ... until air pressures at the hole ... as dictated by the vehicle speed ... prevent it happening.


Cowl hoods are funny things ... They are an outlet vent at slow speeds ... and an inlet scoop at high speeds.

... which is not always a good thing - depending on your driving requirements.


If you want to "draw" hot air out ... the vehicle speed will need to be over about 20mph ... and vents used - located in a useful "slipstream" locations such as the leading edge of the hood ... or the fenders ...

Tis why I just have spaced hinges and a larger firewall seal between the hinges. You can feel hot air wafting out from the rear corners of the hood when stopped ...
The little telltails popout when the fans kick in properly ... and
The little telltails pop out at highway speeds ... and I dont have worry about whether cowl induction air is messing with radiator airflow or lowering engine bay temps too much - so that the fanclutch doesnt work properly when needed.

I guess "draw" wasnt the right word, it will "let" the air out rather.

I completely agree though, and nice job on the popouts to deal with the air flow problem.

[gordo]

can you put more pic of that hood i want to do mine like that that's super cool

[Jeepster19]

Awesome job!Can you make me one?!Lol!:D

[07Negative]

Here ya go http://www.reflexxion.com/rfx/images/products/731800R.JPG

[Mudderoy]

Here ya go http://www.reflexxion.com/rfx/images/products/731800R.JPG

lol cheater.

[07Negative]

It's kind of a slick hood. It's metal too. Something like $500.

[Mudderoy]

It's kind of a slick hood. It's metal too. Something like $500.

The dye broke. It's like $250k, they weren't selling enough of them to have another made. They no longer make them. :(

[07Negative]

No joke? Guess I will have to fab up my own then.

[Mudderoy]

No joke? Guess I will have to fab up my own then.

No joke, I called them. :bang:

[dagr8tim]

No joke, I called them. :bang:

I was wondering what happened to them. Places list them in their catalogs, but nobody had them in stock.