70barracuda Posted May 15, 2020 Posted May 15, 2020 Finally driving the manche after getting the LS swap "done". Noticed that thing puts out a TON of heat. Doesnt overheat at all, but I'd like to help evacuate the underhood heat. My only experience really is with my Cherokee and crawling. I have a cowl hood on that and it definitely helps with heat offroading. But I know that the base of the windshield is a high pressure area and at speed it actually forced into the engine bay creating a bad pressure area. I've looked into heat extractor types but with how close the hood is to the motor, cutting and folding down isn't really an option. Ideally I want the air to pass through the radiator and out the hood over the windshield. I was thinking using hood vents but setting them as close forward as possible. Sound okay? Any help would be great. Don't want a new hood, it'll look way out of place.
thecodemonk Posted May 15, 2020 Posted May 15, 2020 Hood vents can help evacuate the heat, but will only help marginally with any engine heating issues. Some people add spacers to the rear of the hood so that there's a gap at the rear and that seems to work the best for evacuating heat, but it looks...weird to me. I think there's several writeups on using LeBaron vents as hood vents though. I'm waiting to see how it behaves in the summer to see if I have any heat issues on my LS-swap. It was great all winter but..well...that's winter.
neohic Posted May 15, 2020 Posted May 15, 2020 ^Yup I was going to suggest spacers as well. Hate to cut up that beautiful hood of yours.
Pete M Posted May 15, 2020 Posted May 15, 2020 when I put the hood "scoop" on and in the process put a hole in the nice weather-tight factoryseal, I could then smell my engine bay at highway speeds. like, really strong. fortunately the scoop has a fan underneath (it's goal was for cooling the engine bay while on the trails) and turning it on pushed the stinky air forward into the airstream enough to carry it away from the cowl and the smells stopped. so I ran it like that from then on.
70barracuda Posted May 15, 2020 Author Posted May 15, 2020 I don't think i should have over heating issues, the electric fan I have moves 3600cfm and so far today in 80 degree it never got above 205F. but I nearly burned my hand on the hood. I thought about hood spacers as well but along with looking 'off' , it still has the issue that the open area is right at the high pressure area at the base of the windshield. I need something along the lines of these: https://imgur.com/r/foxmustang/JN8wDPB https://circuitdreamer.com/product/parts/exterior/garagestar-universal-drop-vent-heat-extractor/
89 MJ Posted May 15, 2020 Posted May 15, 2020 43 minutes ago, 70barracuda said: I don't think i should have over heating issues, the electric fan I have moves 3600cfm and so far today in 80 degree it never got above 205F. but I nearly burned my hand on the hood. I thought about hood spacers as well but along with looking 'off' , it still has the issue that the open area is right at the high pressure area at the base of the windshield. I need something along the lines of these: https://imgur.com/r/foxmustang/JN8wDPB https://circuitdreamer.com/product/parts/exterior/garagestar-universal-drop-vent-heat-extractor/ What if you looked into a hood like what @Limeyjeeper has on Comanche Dawn?
70barracuda Posted May 15, 2020 Author Posted May 15, 2020 2 hours ago, 89 MJ said: What if you looked into a hood like what @Limeyjeeper has on Comanche Dawn? trying to stick with the factory hood because of how well the patina works on the truck. A new hood would be so out of place, but that one is really sweet
89 MJ Posted May 15, 2020 Posted May 15, 2020 1 hour ago, 70barracuda said: trying to stick with the factory hood because of how well the patina works on the truck. A new hood would be so out of place, but that one is really sweet I see. That makes sense.
Torq_Shep Posted May 16, 2020 Posted May 16, 2020 One other bad thing about hood spacers is it becomes a projectile in a front end wreck as the cowl isnt there to protect you. If you do spacers you should consider high grade bolts at the very least.
Crash Posted May 16, 2020 Posted May 16, 2020 A cowl good would work. Also, find the heat spots and put the vents there. Most likely, towards the front edge, will pull the excess heat .
NC Tom Posted May 16, 2020 Posted May 16, 2020 20 hours ago, Pete M said: when I put the hood "scoop" on and in the process put a hole in the nice weather-tight factoryseal, I could then smell my engine bay at highway speeds. like, really strong. fortunately the scoop has a fan underneath (it's goal was for cooling the engine bay while on the trails) and turning it on pushed the stinky air forward into the airstream enough to carry it away from the cowl and the smells stopped. so I ran it like that from then on. This a is textbook example of "seemed like a good idea the time" huh? They get hot for sure. Mine stopped steaming after I replaced the cap on the overflow bottle. And, I don't lean on the hood after a long drive.
Pete M Posted May 16, 2020 Posted May 16, 2020 I still feel it was a good idea (helps fix the "too hot to touch" issue if you need to do a trail repair under the hood), but it clearly had some unforeseen drawbacks. but also maybe my engine bay is just stinkier than most.
Sir Sam Posted May 17, 2020 Posted May 17, 2020 Personally I say go with the factory hood vents. Theres nothing like fit and finish of an OEM part doing what its meant to do: You can also find these on the Orvis edition ZJ and the 5.9 ZJ. These hood vents are relatively common in the UK, you can find them on ebay uk or from breakers in the UK. I've even seen complete hoods with the vents for sale for $50 or so on ebay uk, I don't need another set but I was tempted to ask if I bought the whole hood if they would remove the vents and ship them to the US.
Ls2xjcomanche Posted May 18, 2020 Posted May 18, 2020 16 hours ago, Sir Sam said: Personally I say go with the factory hood vents. Theres nothing like fit and finish of an OEM part doing what it’s meant to do. Couldn’t agree more . I’m not 100% sure, but I read somewhere that the Orvis XJ vents are not functional and are just for the looks. The 5.9 ZJ ones are and have drip pans as well. I did a quick mock up on my mj the other day.
75sv1 Posted May 18, 2020 Posted May 18, 2020 19 hours ago, Sir Sam said: Personally I say go with the factory hood vents. Theres nothing like fit and finish of an OEM part doing what its meant to do: You can also find these on the Orvis edition ZJ and the 5.9 ZJ. These hood vents are relatively common in the UK, you can find them on ebay uk or from breakers in the UK. I've even seen complete hoods with the vents for sale for $50 or so on ebay uk, I don't need another set but I was tempted to ask if I bought the whole hood if they would remove the vents and ship them to the US. I bought a set here in the US. I remember about $150 to $180. There is a write up somewhere to install them. I got into the test fit phase of and cut the drip pan to clear the braceing on the underside of the hood. Also, I like to run ceramic coated headers. They help in underhood temps.
kansashogan Posted May 18, 2020 Posted May 18, 2020 Several of us have the Poison Spyder vent for a Wrangler. I have a 350 in mine and it cools really well.
ghetdjc320 Posted May 19, 2020 Posted May 19, 2020 Here’s what I did. 69 Mach 1 hood scoop. Fully functional and works great
70barracuda Posted May 21, 2020 Author Posted May 21, 2020 Wow lots of options here. That sunroof style hood would actually be pretty legit... After searching many and many website I think I found some I'm gonna get. https://www.verus-engineering.com/shop/product/hood-louver-kit-large-vents-brz-frs-gt86-332?page=2&category=17 They are angled the exact way I wanted. Help force the air out and not only cool but help with some downforce as well. Plus they make drip rails for them too.
JefCooks Posted May 22, 2020 Posted May 22, 2020 On 5/18/2020 at 7:28 AM, kansashogan said: Several of us have the Poison Spyder vent for a Wrangler. I have a 350 in mine and it cools really well. Do you have a closeup if the Hood? What did you do about the center channel? OP, I’ve been thinking about these but would really like something with a drip rail. http://rodlouvers.com/Jeep-XJ-Louvered-Aluminum-Hood-Bolt-On-cooling-panels-Cherokee-Comanche-louvers-P4921315.aspx
ghetdjc320 Posted May 22, 2020 Posted May 22, 2020 On 5/22/2020 at 4:03 PM, JefCooks said: Do you have a closeup if the Hood? What did you do about the center channel? OP, I’ve been thinking about these but would really like something with a drip rail. http://rodlouvers.com/Jeep-XJ-Louvered-Aluminum-Hood-Bolt-On-cooling-panels-Cherokee-Comanche-louvers-P4921315.aspx There is no center hood “channel” or bracing on the xj hood that run the entire length of the hood. It’s more of a V pattern brace so there is plenty of room to add a vent/scoop without cutting any bracing. I have a set of the hyline off-road vents new in box somewhere at my folks place stateside. If your interested I can see about digging them up
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