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jedi, I saw your post before you deleted it! You better get more mods and crap before you start busting on me :lol:
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I have NO idea what your'e talkin' about. :suspect:
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Originally Posted by laythor
(Post 3554136)
I didn't have a temp gauge till after the hood. Expo has a thread where he simply raised the back of the hood up a half inch and saw declines in temp. I would have to assume 6 large vents would do even more.
Also, what happened to the myth that our OEM hoods couldn't be vented? There was a fairly in depth conversation about it a couple years back, I believe someone even tried it without success. Anyone want to dig up the thread or remember what I am talking about? |
^This guy https://www.rx8club.com/showthread.p...ut+vents+hood? He actually ended up with a very small vent on the passenger side of his car you can see it i think if you go in his user profile and look at his pictures. It looks like he cut away the shock absorbing structure then made the vent so im sure its not as structurally sound.
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Proper tools and it looks like we can vent our hood however we'd like. Structural integrity might start to suffer though...
I'm surprised I didn't finish following that thread back then, haha. I could have sworn I participated too lol |
^ It definitely can be done ive seen a hood. Ill try and get the picture again from the s2k guy. The best proof is MM's hood i think the only limitation may be shape of the vent depending on how much of the structural material you are willing to sacrifice.
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Originally Posted by MazdaManiac
(Post 3554344)
http://sphotos.ak.fbcdn.net/hphotos-..._6422360_n.jpg
http://sphotos.ak.fbcdn.net/hphotos-..._3660524_n.jpg :yumyum: |
I have the seibon tsII hood with the gutters off. I didnt pay much attention to ECT or OIL Temp data enough before to know if there was any improvement in the cooiling department. I suspect there is some and at the least, it cant hurt.
However, from talking with several race teams at local track days, reading post by a rx8 race team on this forum, reading aero books and having a former lotus aero engineer look at my car with the hood installed I have come to the conclusion that the biggest advantage of the vented hood is reduced front end lift, second small advantage is better airflow across the radiator at high speed. Both are acomplished by venting air, or more specificaly venting air pressure out of the hood instead of being trapped under the hood waiting to escape out the bottom of the car or into the wheel wells. When the air in trapped under the hood it builds up pressure and causes lift and drag, when it goes under the vehicle it increases air pressure and causes lift and drag, when the air enters the wheel wells it creates a big air pocket causing lift and drag. For cooling benefits any trapped and pressurized air reduces cooling capabilites. Trapped/pressurized air under the hood makes it difficult for air to pass through the radiator. The trapped air in the wheel wells also makes it difficult for the brakes/tires to be cooled and the air to pass through the oil coolers which vent into the wheel wells. I dont think you get very much air from the engine bay into the wheel wells , however if you could vent the wheel wells I believe you would get both aero and cooling benefits. (I plan on testing this theory at some point soon) Some people are going to argue that mazda designed the vehicle with hours of cad and wind tunel time and there is no benefit to cooling or aero by adding vents. To those people I say, what fantasy world do you live in? It is very obvious that car manufactors have one thing in mind, Profit. If they can get cooling and COD numbers good enough to sell a car, they will stop looking for improvments. Vented hoods and functional brake vents cost money and sell no better then fake vents or scoops. 99% of the puplic buys based on the WOW factor. No sellsman ever sold a car by explaining aero dynamics and cooling to a customer. Lastley, most aero kits you buy have no been tested and in most cases will hurt your COD, not improve it. But if you read a few books, take a long look at your car and try thinking outside the box a little. You will see that there are improvments that can be made. Just start small, do one thing at a time and test it out. Worse thing that can happen is you learn something about aerodynamics. Oh and I get almost no water into my engine bay with the vented hood. |
Originally Posted by tiltmode43
(Post 3559006)
Proper tools and it looks like we can vent our hood however we'd like. Structural integrity might start to suffer though...
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Originally Posted by Highway8
(Post 3572234)
I have the seibon tsII hood with the gutters off. I didnt pay much attention to ECT or OIL Temp data enough before to know if there was any improvement in the cooiling department. I suspect there is some and at the least, it cant hurt.
However, from talking with several race teams at local track days, reading post by a rx8 race team on this forum, reading aero books and having a former lotus aero engineer look at my car with the hood installed I have come to the conclusion that the biggest advantage of the vented hood is reduced front end lift, second small advantage is better airflow across the radiator at high speed. Both are acomplished by venting air, or more specificaly venting air pressure out of the hood instead of being trapped under the hood waiting to escape out the bottom of the car or into the wheel wells. When the air in trapped under the hood it builds up pressure and causes lift and drag, when it goes under the vehicle it increases air pressure and causes lift and drag, when the air enters the wheel wells it creates a big air pocket causing lift and drag. For cooling benefits any trapped and pressurized air reduces cooling capabilites. Trapped/pressurized air under the hood makes it difficult for air to pass through the radiator. The trapped air in the wheel wells also makes it difficult for the brakes/tires to be cooled and the air to pass through the oil coolers which vent into the wheel wells. I dont think you get very much air from the engine bay into the wheel wells , however if you could vent the wheel wells I believe you would get both aero and cooling benefits. (I plan on testing this theory at some point soon) Some people are going to argue that mazda designed the vehicle with hours of cad and wind tunel time and there is no benefit to cooling or aero by adding vents. To those people I say, what fantasy world do you live in? It is very obvious that car manufactors have one thing in mind, Profit. If they can get cooling and COD numbers good enough to sell a car, they will stop looking for improvments. Vented hoods and functional brake vents cost money and sell no better then fake vents or scoops. 99% of the puplic buys based on the WOW factor. No sellsman ever sold a car by explaining aero dynamics and cooling to a customer. Lastley, most aero kits you buy have no been tested and in most cases will hurt your COD, not improve it. But if you read a few books, take a long look at your car and try thinking outside the box a little. You will see that there are improvments that can be made. Just start small, do one thing at a time and test it out. Worse thing that can happen is you learn something about aerodynamics. Oh and I get almost no water into my engine bay with the vented hood. Agreed 100% |
just a shot in the dark here but... would you get heat outa the engine bay better by mounting some radiator fans on the underside of the hood under the vents?
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would be interesting to see if it made any real difference to engine temps.
Air takes the path of lease resistance and there's lots of wide open spaces for the air to come from that would be nowhere near the engine. |
i thought part of vented hoods purpose were more for downforce purposes
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I seriously doubt any CF hood is wind tunnel tested to help increase downforce, it might help provide more cooling and reduce pressure underneath the hood but I dont see how the design would increase downforce at all.
A cool tip for anyone who cant pay for wind tunnel testing, its pretty simple and will give you a decent idea where air goes. Basically wait till it hits in the 50 degrees and get up around 7am, your car should have accumulated condensation all over your car. Basically warm up your car and take her for a quick spin down the highway to 80mph and stop and see where there is still water. You will see more water on the hood and hardly any on the door panels etc. Its a cool trick to see where air actually flows... :) |
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^ Interesting idea!
This piece of art just got delivered to my body shop. Very excited. :evil_laug https://www.rx8club.com/attachment.p...1&d=1285961971 |
Nice hood Jess... They always look good on blue
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I currently have a Winning Blue Gun Metal theme going on, and yeah, I'm digging it.
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thats the exact hood i want on my WB
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Originally Posted by dmedz8
(Post 3734629)
thats the exact hood i want on my WB
:mchase: Zombies. |
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still has the vent covers..i might take them off tomorrow, it has to make a difference not having all that HOT air traped under the stock hood imo
Attachment 252936 |
Originally Posted by laythor
(Post 3554116)
I've gone through two nor cal rainy seasons without issue. It is fun to see the heat pouring out of the vents knowing that they're working
You have no idea! San Jose..............average rainfall = 15.08 Inches Melbourne...........average rainfall = 49.29 inches |
water falling down is water falling down. I'm not talk light misting but rather inches per hour during a storm or two. It's your own fault for living in god's waiting room (aka florida), move to less wet climates sir :)
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^...... :)
God's waiting room...........I like that! Contrary to popular belief, we aren't all cotton tops(aka Q-tips)! |
if everyone is worried about water getting in just buy a car cover or garage your car. barely any water gets in while your driving, and as far as at the car wash, i cover the air filter and electrical parts with plastic bags and just remove them afterwords. even after a car wash you see minimal water getting into the vents
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Originally Posted by markav33
(Post 3751184)
even after a car wash you see minimal water getting into the vents
When driving, the air passing over will pull both the air out and keep water from getting in. Besides the fact that nothing under the vents will be damaged by a little water. |
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