There are some pics of my RH with a cowled hood. Mine is alittle more extreme than just putting washers under the hindges. My hood has been tweaked and bent into that shape. I have a high point of 2.5" with the weather stripping removed on the rear edge as well.
What I did was use an .5" wide piece of delicate cotton linen that was about 5 inches long. I duct taped it to the very edge of my hood at its highest point leaving about 4" of cloth to test. With as high as my hood is there, it is extremely easy to see.
The wind was also not blowing much.79*F14% humidityEngine at normal operating temp and I use a clutch fan with a new clutch.
What I found.Up to about 25 I had the linen standing against the windshield with occaisional flips up. That tells me that there is a negative pressure there allowing the heat out of the engine bay.After 25 up to about 60 there was a positive pressure as the linen was pushed under the hood. The highest pressure being about 45-50. This pressure is strong as the linen was laid flat up against the bottom edge of the hood.After 70 it was in and out left and right... very chaotic. Buffeted (sp) pretty much.
What do I think?I think my mod isnt a waste of time as it helps in town driving with stop and go traffic. Above town driving, your moving enough that adequate air is hitting the radiator and the negative pressure under the car is sucking it out.
Because my hood is humped in the middle and not flat like most of y'alls, maybe it will be different, but I doubt it.
I am going to channel the air from the "snorkels" in my hood over the radiator to see if that adds enough pressure to overcome the positive pressure at the base of the windshield.
I hope this answers some quetions.
Then the real test
I taped off my hood today to ensure my cowling worked... I provided pics. I drove the same roads, in the same gear, same speed, about 10 minutes apart to ensure consistantancy.It was hot today... 90's here. sux to be in PHX when I tested. By the time I smoked two joints before I smoked two joints it was cooler before I wrote this so I cant vouch for actual outside temp.
This is what I found:
On my rag-tag thermometer that I use to check internal case temps on my Overclocked PC's...HI = 158.0*F Plus
Hood Cowled with a 2.75" ( I raised it with a gradual from the body line in the hood) inch opening to the world. It is different now with better distinction.
25-35mph in 3rd = HI40-55 mph in 3rd = 145-149*65 in 4th gear = 147*65 in OD = 133 - 137*
______________________________________________________
Hood Cowled but covered with plastic and good duct tape... not that [censored] stuff Alfred, no doubt, has in his tool box... but almost as good as Frankie has... :lol: anyways with the hood sealed up as shown....
up to 60mph it was over 158* plus in my engine bay as indicated by the "HI" so I have no indication of actual temp.
at 65-68 in 4th gear it dropped to 155* and held fast for like 5 minutes.
HERE IS THE KICKER !!!!!!!!!!!!!!!!!
At 65 in OD for several minutes... I saw 120* to 137*
The odd thing I found. I found that the plastic on my Hood was always inflated but seemed to suck in at 50-60 at 2.75" on center ( highest ) hood... the corners were pushed way away from the body.
My conclusion...
Cowling works. period. Temps in general are lower at typical city driving. Above that it is still acceptable by showing no more than 60* higher than ambient.
Cowl that rascal. Let the heat out. Are you scared about teaking that hood? Show some damn commitment and get something done.... let the heat out.
Nothing says slow car like a heat induced [censored] performance... especially to 90% of us N/A drivers.
I took the time to cowl my hood. I bent it and ruined it for "stock" looking applications. I spent time shaping it so it raises only in the middle... dont get excited Alfred... I'm still talking about my car...
There is your proof boys....
Cowled hood and its effects... researched.
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Jays90240SX
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S13hashiriya
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TheDrumAndTheBass
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Hmmmm, How about that (see below) for a cowled hood? That came off my old pontiac, and I made the hood myself. With the scoops in that position the air came right through the radiator, the out the vents, resulting in a temp drop of about 25/30 degrees. Of course if you made a hood like that for a 240 you might have to place the scoops diffrently, but they should have the same effect. Let me know how ya like the looks. Of course, imagine it painted and sanded and everything. That pic was take at about 50% completed. Still had a good boit of bondo work and sanding after those pix were done.Ryan
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Holisticbeatz
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Very informative, good job.
This guy did something sorta similar to what you did. He wrote an article here about it:
http://www.240sx.org/links/installs/hood/hood.htm
This guy did something sorta similar to what you did. He wrote an article here about it:
http://www.240sx.org/links/installs/hood/hood.htm
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S13hashiriya
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TheDrumAndTheBass
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Damn man you're pretty good, cause thats exactly what that hood came off of. I did a bunch of custom body work to that car, (I.E. 3rd Gen RX-7 front bumper). Were's your friend from, cause if he's close to FL I'd be more then happy to work something out for him. If ya need to get in contact with me my AIM name is "NismaRacing" (yes thats Nisma, not Nismo).Ryan
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TheDrumAndTheBass
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Yeah man, tell your buddy to e-mail me at [email protected] . Everyone else, sorry bout all the Fiero related stuff, but since PM's and e-mail is down, don't have much other choice.
P.S. O Yeah, Brass Monkey Baby
P.S. O Yeah, Brass Monkey Baby