Any good experiences with TII hood?
06-10-02, 02:37 AM
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Any good experiences with TII hood?
just looking for a cool looking and functional hood scoop that isnt too hard to do-thanks
06-10-02, 09:59 AM
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"functional" is the key word here. I personally think that a hood scope on a hood is a bad spot to get air intake. Low air pressure. 
Although, I'll be getting on just for cosmetic reasons and to get minor air intake. I would recommend a front air dam for maxium air intake.
Although, I'll be getting on just for cosmetic reasons and to get minor air intake. I would recommend a front air dam for maxium air intake.
06-10-02, 12:41 PM
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put a reverse facing hood scoop (it'll seem backwards, but trust me) and the opening should be located FACING the windshield, as close to where the hood and the windshield meet (that's a high pressure area).
06-10-02, 01:06 PM
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Yeah, look into "reverse" hood scoops. That's called the Venturi effect (if I remember correctly), when air rushes back into an opening. Very effective. This same thing is used to hold high performance racers down (ie formula racers, new Ferrari FX 
). I plan on doing this same sort of thing on the underside of the car in the lover cover thing (that protects the engine from rocks, water, etc.) to feed some more air into the oil cooler. With a reverse scoop, water is also less likely to get in there.
I bet "how stuff works" has some good info on this...
). I plan on doing this same sort of thing on the underside of the car in the lover cover thing (that protects the engine from rocks, water, etc.) to feed some more air into the oil cooler. With a reverse scoop, water is also less likely to get in there.I bet "how stuff works" has some good info on this...
06-10-02, 08:48 PM
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Air rushing past an opening creates a slight vacuum, which in theory should increase the air flow past the engine. Having the opening facing the wind, seems like it would cause more air to flow into the engine bay, but the air isn't where it can be used, unless you have a TMIC, like the TII.
Sorry to bring out the physics of aerodynamics, but lets take a look at who happens as air approches your car. As the air encounters the front of your car, it tries to remain smooth, and wants to go right through the car. obviously it can't, it has to go around the car somehow. the way the radiator works, is it is a short-cut for the air, which would rather not have to go over or aroud the car. but for a moment, let's assume the the engine bay is comletely sealed, where does the air have to go after traveling through the radiator. If the bay is sealed it has nowhere to go, so it backs up, and builds up pressure, which eventully gets so high that the air hitting the front of the car no longer sees the vent to the radiator as the path of least resistance, and goes around the car instead.
Of course nobody's engine bay is completly sealed off, so this never happen, but it isn't a strait shot through the car after the radiator. The engine, the firewall adn everything else acts as a partial block, which raises the pressure, and limits the air that comes through the radiator.
Now lets look at what a vent or a scoop does. A vent in theory could do three things, increase flow under the hood(ie lowers coolant and toverall under-hood temps), lower the overall drag of the car , and increase downforce. Back to the previous example, with a vent the air now has somewhere else to go. It nolonger has to sneak out the cracks in the hood, or worse, go under the car. the vent, due to the rushing air above creates a slight vacuum, which draws air out of the engine bay and sends it on its marry way over the car. So its like haveing a little fan pulling the air out of the engine bay. Also, lack of air the would have otherwise gone under the car, causes a slight vacuum which increases downforce.
The reduced drag and increased downforce are probably not enough to make much difference, but the flow and reduced under-hood temps are usually significant.
So which is better, forward scoop, reverse scoop, or vent. I would suspect a reverse scoop to be the best for air flow, because the air will want to leave the scoop at the same velocity as the air traving over the hood. The vent would be slightly worse. The forward scoop would do next to nothing, because it is forcing yet more air into the engine bay, instead of aiding its escape.
I'd like to put in a series of vents or a reverse scoop myself, so if anyone knows of any options for a FB/SA, I'd like to know
Sorry to bring out the physics of aerodynamics, but lets take a look at who happens as air approches your car. As the air encounters the front of your car, it tries to remain smooth, and wants to go right through the car. obviously it can't, it has to go around the car somehow. the way the radiator works, is it is a short-cut for the air, which would rather not have to go over or aroud the car. but for a moment, let's assume the the engine bay is comletely sealed, where does the air have to go after traveling through the radiator. If the bay is sealed it has nowhere to go, so it backs up, and builds up pressure, which eventully gets so high that the air hitting the front of the car no longer sees the vent to the radiator as the path of least resistance, and goes around the car instead.
Of course nobody's engine bay is completly sealed off, so this never happen, but it isn't a strait shot through the car after the radiator. The engine, the firewall adn everything else acts as a partial block, which raises the pressure, and limits the air that comes through the radiator.
Now lets look at what a vent or a scoop does. A vent in theory could do three things, increase flow under the hood(ie lowers coolant and toverall under-hood temps), lower the overall drag of the car , and increase downforce. Back to the previous example, with a vent the air now has somewhere else to go. It nolonger has to sneak out the cracks in the hood, or worse, go under the car. the vent, due to the rushing air above creates a slight vacuum, which draws air out of the engine bay and sends it on its marry way over the car. So its like haveing a little fan pulling the air out of the engine bay. Also, lack of air the would have otherwise gone under the car, causes a slight vacuum which increases downforce.
The reduced drag and increased downforce are probably not enough to make much difference, but the flow and reduced under-hood temps are usually significant.
So which is better, forward scoop, reverse scoop, or vent. I would suspect a reverse scoop to be the best for air flow, because the air will want to leave the scoop at the same velocity as the air traving over the hood. The vent would be slightly worse. The forward scoop would do next to nothing, because it is forcing yet more air into the engine bay, instead of aiding its escape.
I'd like to put in a series of vents or a reverse scoop myself, so if anyone knows of any options for a FB/SA, I'd like to know
06-11-02, 09:33 PM
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The cowl is a high-pressure area. A rear-facing scoop of sufficient size and located close enough to the windshield base (cowl induction... thanks, GM) is effective at getting cool outside air into the engine compartment as long as the opening is sealed to the carb. The location also minimizes the chances of ingestiong rocks, road debris, and other foreign objects.
If you do not think this is the case, look at NASCAR, SCCA Trans-Am, and numerous other categories of racing where the cowl is used as the source of intake air.
If you do not think this is the case, look at NASCAR, SCCA Trans-Am, and numerous other categories of racing where the cowl is used as the source of intake air.
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06-12-02, 08:46 AM
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Thank you.. that's what I've been trying to say for a few days now and nobody listened to me.
Originally posted by DoriZaru
The cowl is a high-pressure area. A rear-facing scoop of sufficient size and located close enough to the windshield base (cowl induction... thanks, GM) is effective at getting cool outside air into the engine compartment as long as the opening is sealed to the carb. The location also minimizes the chances of ingestiong rocks, road debris, and other foreign objects.
If you do not think this is the case, look at NASCAR, SCCA Trans-Am, and numerous other categories of racing where the cowl is used as the source of intake air.
The cowl is a high-pressure area. A rear-facing scoop of sufficient size and located close enough to the windshield base (cowl induction... thanks, GM) is effective at getting cool outside air into the engine compartment as long as the opening is sealed to the carb. The location also minimizes the chances of ingestiong rocks, road debris, and other foreign objects.
If you do not think this is the case, look at NASCAR, SCCA Trans-Am, and numerous other categories of racing where the cowl is used as the source of intake air.
06-12-02, 10:31 AM
#9
Originally posted by fatboy7
Air rushing past an opening creates a slight vacuum, which in theory should increase the air flow past the engine. Having the opening facing the wind, seems like it would cause more air to flow into the engine bay, but the air isn't where it can be used, unless you have a TMIC, like the TII.
Sorry to bring out the physics of aerodynamics, but lets take a look at who happens as air approches your car. As the air encounters the front of your car, it tries to remain smooth, and wants to go right through the car. obviously it can't, it has to go around the car somehow. the way the radiator works, is it is a short-cut for the air, which would rather not have to go over or aroud the car. but for a moment, let's assume the the engine bay is comletely sealed, where does the air have to go after traveling through the radiator. If the bay is sealed it has nowhere to go, so it backs up, and builds up pressure, which eventully gets so high that the air hitting the front of the car no longer sees the vent to the radiator as the path of least resistance, and goes around the car instead.
Of course nobody's engine bay is completly sealed off, so this never happen, but it isn't a strait shot through the car after the radiator. The engine, the firewall adn everything else acts as a partial block, which raises the pressure, and limits the air that comes through the radiator.
Now lets look at what a vent or a scoop does. A vent in theory could do three things, increase flow under the hood(ie lowers coolant and toverall under-hood temps), lower the overall drag of the car , and increase downforce. Back to the previous example, with a vent the air now has somewhere else to go. It nolonger has to sneak out the cracks in the hood, or worse, go under the car. the vent, due to the rushing air above creates a slight vacuum, which draws air out of the engine bay and sends it on its marry way over the car. So its like haveing a little fan pulling the air out of the engine bay. Also, lack of air the would have otherwise gone under the car, causes a slight vacuum which increases downforce.
The reduced drag and increased downforce are probably not enough to make much difference, but the flow and reduced under-hood temps are usually significant.
So which is better, forward scoop, reverse scoop, or vent. I would suspect a reverse scoop to be the best for air flow, because the air will want to leave the scoop at the same velocity as the air traving over the hood. The vent would be slightly worse. The forward scoop would do next to nothing, because it is forcing yet more air into the engine bay, instead of aiding its escape.
I'd like to put in a series of vents or a reverse scoop myself, so if anyone knows of any options for a FB/SA, I'd like to know
Air rushing past an opening creates a slight vacuum, which in theory should increase the air flow past the engine. Having the opening facing the wind, seems like it would cause more air to flow into the engine bay, but the air isn't where it can be used, unless you have a TMIC, like the TII.
Sorry to bring out the physics of aerodynamics, but lets take a look at who happens as air approches your car. As the air encounters the front of your car, it tries to remain smooth, and wants to go right through the car. obviously it can't, it has to go around the car somehow. the way the radiator works, is it is a short-cut for the air, which would rather not have to go over or aroud the car. but for a moment, let's assume the the engine bay is comletely sealed, where does the air have to go after traveling through the radiator. If the bay is sealed it has nowhere to go, so it backs up, and builds up pressure, which eventully gets so high that the air hitting the front of the car no longer sees the vent to the radiator as the path of least resistance, and goes around the car instead.
Of course nobody's engine bay is completly sealed off, so this never happen, but it isn't a strait shot through the car after the radiator. The engine, the firewall adn everything else acts as a partial block, which raises the pressure, and limits the air that comes through the radiator.
Now lets look at what a vent or a scoop does. A vent in theory could do three things, increase flow under the hood(ie lowers coolant and toverall under-hood temps), lower the overall drag of the car , and increase downforce. Back to the previous example, with a vent the air now has somewhere else to go. It nolonger has to sneak out the cracks in the hood, or worse, go under the car. the vent, due to the rushing air above creates a slight vacuum, which draws air out of the engine bay and sends it on its marry way over the car. So its like haveing a little fan pulling the air out of the engine bay. Also, lack of air the would have otherwise gone under the car, causes a slight vacuum which increases downforce.
The reduced drag and increased downforce are probably not enough to make much difference, but the flow and reduced under-hood temps are usually significant.
So which is better, forward scoop, reverse scoop, or vent. I would suspect a reverse scoop to be the best for air flow, because the air will want to leave the scoop at the same velocity as the air traving over the hood. The vent would be slightly worse. The forward scoop would do next to nothing, because it is forcing yet more air into the engine bay, instead of aiding its escape.
I'd like to put in a series of vents or a reverse scoop myself, so if anyone knows of any options for a FB/SA, I'd like to know
Best way to showed an example is light a cig and leave the window up, smoke goes everywhere, crack the window just a slight bit, and it starts pulling the smoke out, but hardly any air comes in
06-12-02, 12:00 PM
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Re: Any good experiences with TII hood?
If you had a Turbo II style hood scoop, and reversed it (or not), and didn't seal it to an air intake, I think it would still serve two functions - it would bring in some air when the car is at speed, and also it would provide a route for hot air to escape when the engine is shut down.
Last edited by genrex; 06-12-02 at 12:03 PM.
