Hood spacers
Some of the local rx7 guys were talking about hood spacers so I came up with these. Not sure If I'll keep them on my car as my hood is already vented.
http://www.levelzeromotorsports.com/..._spacers/1.jpg http://www.levelzeromotorsports.com/..._spacers/2.jpg http://www.levelzeromotorsports.com/..._spacers/3.jpg http://www.levelzeromotorsports.com/..._spacers/4.jpg http://www.levelzeromotorsports.com/..._spacers/5.jpg |
my car had the hood raised, you just raise the hinge at the bottom with longer bolts and washers =easier than making a piece. but yours is pretty neat. I grew out of the raised hood thing.
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how is the temp drop
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Originally Posted by Hypertek
(Post 9385578)
my car had the hood raised, you just raise the hinge at the bottom with longer bolts and washers =easier than making a piece. but yours is pretty neat. I grew out of the raised hood thing.
Originally Posted by R.O.D
(Post 9385581)
how is the temp drop
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ya i raised mine and noticed a drop in the temps
made me feel a lot better lol |
I heard this affects the aerodynamics by creating a pressure point at the bottom of the windshield, but don't quote me on this.
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Yeah, I'm sure if my hood wasn't venter they'd make way more of a difference. Sitting in traffic I can actually see the heat waves coming out of the passenger side vent.
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Originally Posted by Texas_Turbo7
(Post 9385625)
I heard this affects the aerodynamics by creating a pressure point at the bottom of the windshield, but don't quote me on this.
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Meh, pretty pointless.
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Originally Posted by need RX7
(Post 9385637)
Meh, pretty pointless.
It's be proven for years that using the high pressure at the base of the wind screen has many positive effects. Ideally you want your intake to plumb into the cowl area (which a few OEM cars actually do) but if the goal is more airflow through the engine bay this is an simple way to accomplish it with little increase in drag. There are only two high pressure zones on a moving car that are appropriate for cooling. The front of the car and the cowl. The problem is if you increase the frontal area you increase drag. This is the exact reason cowl hoods work so well and why nascar cars all plumb their intake into the cowl. It's basically a free ram air effect. Hood scoops may offer a benefit to cooling but they also increase frontal area and drag. Thats why the TII's have a higher coefficient of drag then the NA's. The ideal set up would be a naca duct, but those are not easy to make and they take away from engine bay space. |
how would a naca duct look on a n/a hood, i cant say ive seen one on a hood let alone a fc. just curious how to set one up. might be interested in doing such a thing to mine
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I think it would look great. It's be a custom hood and you's have to be good with fiberglass or maybe metal working.
Here is a picture of them in an OEM application :) http://upload.wikimedia.org/wikipedi...arking_lot.jpg |
^ i would love a set up like that! would use it to cool the ex. side of the turbo and add another cool air duct to the intake, i love my car NOT running hot at all!!
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Originally Posted by R.O.D
(Post 9385799)
^ i would love a set up like that! would use it to cool the ex. side of the turbo and add another cool air duct to the intake, i love my car NOT running hot at all!!
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Originally Posted by need RX7
(Post 9385637)
Meh, pretty pointless.
its the same thing as a cowl hood on a muscle car. its been proven to work for years. |
learn something new everyday, thanks!
Originally Posted by levelzero
(Post 9385814)
Actually you wouldn't really want to cool the turbine housing. Hot exhaust gases have a higher velocity and are better for spooling the turbo. By cooling the housing and gases you'd spool up a bit slower. Now if you ceramic coated the housing and manifold you could then use the duct to help cool the downpipe and surrounding areas.
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Raise hood?
Man as akward as it has become, Millions of Honda lovers have adopted this JDM look into their low quality cars. This has really become a Honda trademark for kids so I really started to dislike this idea of having your hood fit sloppy.
True for performance, but there is nothing better to me than a clean clean clean FC on the road. :) |
Originally Posted by djAngel
(Post 9385976)
Man as akward as it has become, Millions of Honda lovers have adopted this JDM look into their low quality cars. This has really become a Honda trademark for kids so I really started to dislike this idea of having your hood fit sloppy.
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Looks and style are very subjective. I personally prefer the hood to be flush, but that being said on the rare occasion when I do track my car, heat is a major problem both to reliability and performance so for the 5 minutes it takes to install these I'd do it. For me when it comes to performance it's always function over form. It's actually why I have a black hood. I found a blue aluminium one and didn't want to pay for paint, but really wanted the lighter hood. Flat black is slightly better then blue so a few rattle cans and now the car is 40lb lighter :)
I've seen a few cars where i actually liked the look of the raised hood. I think for me it was because the cars were balls out drift cars and it wasn't done for appearance but because the cars were running hairy edge and needed every little tweak and advantage they could get. That to me is the definition of a high performance vehicle :) |
That is not a vent! It's an cowl intake...
If you go by theory, it will increase pressure in the engine bay (so behind the radiator) and decrease the amount of air passing through the radiator, hurting cooling performance. Riz. |
Originally Posted by Tofuman FC3S
(Post 9387106)
That is not a vent! It's an cowl intake...
If you go by theory, it will increase pressure in the engine bay (so behind the radiator) and decrease the amount of air passing through the radiator, hurting cooling performance. Riz. You make a good point about increasing the pressure in the engine bay, although it's not quite accurate. Hot air rises so at a standstill with the hood raised or vented the air can escape out of the back of the hood, helping prevent heat soak. At low speed the air will actually flow out of the rear of the hood allowing more air to pass through threw radiator due to less of a restriction. At higher speeds air is actually drawn/forced through the back of the hood and exits at the lower back of the engine bay. This actually creates a suction effect and helps pull air through the radiator, sort of the same way exhaust scavenging works. This also passes more air over the actual engine cooling the engine itself and not just the coolant. High speeds are not much of a problem for cooling as there is plenty of airflow through the radiator. It's at idle and low speeds that the engine bay turns into a furnace. When I stop my car and let it sit for a few minutes, the vents in my hood get so hot that they will sometimes burn you. This is simply from the shear amount of ambient heat escaping through them. I'm not saying a raised hood or hood vents are the end all and be all, simply sharing some of my personal experiences and knowledge I've gained from researching cooling efficiency. In my opinion nothing but good things are gained from allowing an engine to run cooler (but not to far below operating temps). You make more power, the oil breaks down slower and lubricates better, gaskets/seals last longer and electronics are less likely to melt/die. On most cars you don't need to worry about cooling, but the rotary is a beast like no other and the amount of heat it generates is mind boggling sometimes.....I have teh scars to prove it :) http://www.levelzeromotorsports.com/...X7/vents_1.jpg |
Wow this thread hasn't been closed because that's 'such a dangerous mod' yet? I'm really surprised....
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Originally Posted by incubuseva
(Post 9387818)
Wow this thread hasn't been closed because that's 'such a dangerous mod' yet? I'm really surprised....
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Originally Posted by levelzero
(Post 9387802)
When I said vent was referring to the ones in the center of my hood, see the picture below.
You make a good point about increasing the pressure in the engine bay, although it's not quite accurate. Hot air rises so at a standstill with the hood raised or vented the air can escape out of the back of the hood, helping prevent heat soak. At low speed the air will actually flow out of the rear of the hood allowing more air to pass through threw radiator due to less of a restriction. At higher speeds air is actually drawn/forced through the back of the hood and exits at the lower back of the engine bay. This actually creates a suction effect and helps pull air through the radiator, sort of the same way exhaust scavenging works. This also passes more air over the actual engine cooling the engine itself and not just the coolant. High speeds are not much of a problem for cooling as there is plenty of airflow through the radiator. It's at idle and low speeds that the engine bay turns into a furnace. When I stop my car and let it sit for a few minutes, the vents in my hood get so hot that they will sometimes burn you. This is simply from the shear amount of ambient heat escaping through them. I'm not saying a raised hood or hood vents are the end all and be all, simply sharing some of my personal experiences and knowledge I've gained from researching cooling efficiency. In my opinion nothing but good things are gained from allowing an engine to run cooler (but not to far below operating temps). You make more power, the oil breaks down slower and lubricates better, gaskets/seals last longer and electronics are less likely to melt/die. On most cars you don't need to worry about cooling, but the rotary is a beast like no other and the amount of heat it generates is mind boggling sometimes.....I have teh scars to prove it :) Airflow is all about positive and negative pressures, and each setup (speaking specifically of engine bays) is different. Belly pan or not, fan shourd or not, rear aluminum pan or not. No one mod will affect each car the same. Tape some tell tales to it and go for a drive. Video tape it and post it up so there's no more debate about whats going in or coming out. Of course you'll see heat rising out of the hood while stopped. You can see that without hood vents :) I think its a neat idea, Aerodyne tried to make adjustable ones back in the day. But to me, it looks like some yahoo didn't know how to fit a panel. But I like neat ideas, top marks on that. |
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