Rear vented hood pics, ready for molding :-)
03-17-08, 06:43 AM
#26
My 7 is my girlfriend.
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Does the opening of the vent itself not act as a lip? The air is flowing in one direction and as it flows over the opening it should be creating a low pressure zone. The opening has a like a 2-3 inch drop. Its not just a hole in the hood like the Evo, which is why the Evo has the lip around the leading edge of the vent. Also with the rear edge of the hood propped up, you leave the sides open for air to flow out of, and that's why it actually sucks air in. The air already under the hood has to be able to go somewhere before more air can be pulled in. The biggest problem with the stock car is the stagnant air under the hood already creates lift. I know this as well as most of us should, just by watching the rear edge of the stock hood lift at highway speeds. Any vent that will allow that air to flow out of the engine bay will help not just with cooling but with front end grip as well. I know my car gets a little squirrely at around 160KPH, even with the new suspension.
03-17-08, 08:27 AM
#27
dark side i sense in him
so what the hell, is this the new thread for getting the vented hood?
if so do we need to start a list? lol still was wacthing the last thread for progress.
PM me to let me know whats up, pleez
1. Darthrotary/ vented..?
if so do we need to start a list? lol still was wacthing the last thread for progress.
PM me to let me know whats up, pleez
1. Darthrotary/ vented..?
03-17-08, 01:40 PM
#29
Does the opening of the vent itself not act as a lip? The air is flowing in one direction and as it flows over the opening it should be creating a low pressure zone. The opening has a like a 2-3 inch drop. Its not just a hole in the hood like the Evo, which is why the Evo has the lip around the leading edge of the vent. Also with the rear edge of the hood propped up, you leave the sides open for air to flow out of, and that's why it actually sucks air in. The air already under the hood has to be able to go somewhere before more air can be pulled in. The biggest problem with the stock car is the stagnant air under the hood already creates lift. I know this as well as most of us should, just by watching the rear edge of the stock hood lift at highway speeds. Any vent that will allow that air to flow out of the engine bay will help not just with cooling but with front end grip as well. I know my car gets a little squirrely at around 160KPH, even with the new suspension.
http://www.autospeed.com/cms/A_2162/article.html
03-17-08, 04:22 PM
#30
Wrkn Toyota, Rootn Wankel
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No not normally because the air flowing over the hood is under HUGE amouts of pressure and constantly pushing against the car. Remember air resiatance squares as the speed increases, so your speed doubles wind resistance quadruples. I'm not going to say it's not going to work, i'm just saying there's a possibility it might not. If it does work hell put me on the list. An easy way to check under hood pressure is shown here.
http://www.autospeed.com/cms/A_2162/article.html
http://www.autospeed.com/cms/A_2162/article.html
My vented hood that I am still working on (I know, when the hell will I get to it?
) takes advantage of that idea, in theory it should allow all that air to go through the hood rather than under the car. After all, air simple wants to get to an equal pressure as easily as it can. (Similar to electricity wanted the shortest path to ground, and water wanting the shortest path to a level surface)Simple example is this:
Our car's inlet for air to pass through the radiator is located at the bottom of the fender close to the ground, the air is pushed through that opening into the engine bay. There is a metal undertray that bolts under the oilpan and to the bumper to channel this air through the radiator rather than leak through the gaping hole that wouold be there sans undertray. As that air completes its trip through the radiator we end up with a small problem.
Namely, that air has no where to go but to follow under the car through the tranny tunnel and along the underside. Though the air does not go along the car completely. If you have ever stuck your hand out idling at a stoplight with the cooling fan on you can feel the heat from the engine bay exiting just behind the front wheel and along the fender.
So according to these absolute facts that we know of, having vents in the hood should work, because the negative pressure caused by the air rushing over the opening will be helped by the positive pressure of air flowing through the engine bay.
At least this is just my observation and opinion, feel free to beat me down with your critism.
Is there a price for these vented hoods?????
03-18-08, 12:00 PM
#34
Wrkn Toyota, Rootn Wankel
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) has to logically pass under the car...Or is you are implying an exhaust leak, that is highly improbable... I replaced all the gaskets and checked the exhaust for leaks recently.
Also something to note, I only really notice it when the fan engages.
03-18-08, 11:37 PM
#36
I am thinking that as well, but it also makes sense that the air that gets sucked into the engine bay and collects the heat from the engine (god knows it gets hot enough to steam rain when I idle at a stoplight sometimes ) has to logically pass under the car...
Or is you are implying an exhaust leak, that is highly improbable... I replaced all the gaskets and checked the exhaust for leaks recently.
Also something to note, I only really notice it when the fan engages.
) has to logically pass under the car...Or is you are implying an exhaust leak, that is highly improbable... I replaced all the gaskets and checked the exhaust for leaks recently.
Also something to note, I only really notice it when the fan engages.
03-19-08, 12:41 PM
#38
djessence
03-19-08, 04:32 PM
#41
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have you even seen the videos of rx7 headers glowing red. steel glows red a little before the melting point. i belive its 2600 f steel melts. a tig arc when your welding over 1/4 steel is hotter then the sun. most people are confused about how the sun heats the earth.
not sure how to explain this with the proper terms. there are a few types of heat. ill explain the ones i know how using a cooking sheet and a flash light.
first when you pull a cooking sheet out of a oven the heat you feel by putting your bare hand on it is one form of heat.
the second form of heat i know of is the feeling of heat when you hand is near the cooking sheet thats one form of heat.
and the last form of heat i know of is the heat giving off by light. take any really bright flash light or spot light, if your hand is not in the beam of light you would feel x amount of heat on you hand. place you hand in the beam of light if its bright enough you'll feel a temp change. which is how the sun heats the earth.
some one please explain what i said with better word's lol.
dont most piston motors run around 1000 deg F.
not sure how to explain this with the proper terms. there are a few types of heat. ill explain the ones i know how using a cooking sheet and a flash light.
first when you pull a cooking sheet out of a oven the heat you feel by putting your bare hand on it is one form of heat.
the second form of heat i know of is the feeling of heat when you hand is near the cooking sheet thats one form of heat.
and the last form of heat i know of is the heat giving off by light. take any really bright flash light or spot light, if your hand is not in the beam of light you would feel x amount of heat on you hand. place you hand in the beam of light if its bright enough you'll feel a temp change. which is how the sun heats the earth.
some one please explain what i said with better word's lol.
dont most piston motors run around 1000 deg F.
03-19-08, 05:48 PM
#45
Bill Hates
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03-19-08, 07:31 PM
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03-19-08, 09:49 PM
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03-19-08, 09:52 PM
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When I first got my RX, I parked on long damp grass. I was about 5 feet away from the car when I noticed that it was starting to smoke under the car.