XJ XJ8 / XJR ( X308 ) 1997 - 2003

Random wild and maybe ineffective idea...

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Old Jun 8, 2012 | 11:06 PM
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Default Random wild and maybe ineffective idea...

Since cooling is always an issue as we add boost, etc. Please tell me, would it improve cooling airflow if there were some vents toward the back of the hood, in the hood?

Is it functionally better for all the air to go through the radiators and then down under the car, or would this idea functionally be an improvement, cooling wise?
 
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Old Jun 9, 2012 | 12:13 AM
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Similar to cowl induction may be a good idea but never know til ya try and its not the under hood temps people are talking about when adding boost its the inlet temps tht get high
 
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Old Jun 9, 2012 | 12:50 AM
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The further you go to the windshield the higher the pressure, and this is actually not what you want imho, a so you don’t want to create a positive pressure in the engine bay.

You want more cooling, so more air flowing thru the radiators. This higher flow of air can be achieved by increasing the frontal pressure, and create under pressure after the radiators. You can do this for instance with aerodynamic aerodynamic changes like a front splitter. Or more simpler, control your engine fans, to turn more often and faster.
 
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Old Jun 9, 2012 | 10:00 AM
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Originally Posted by avos
The further you go to the windshield the higher the pressure, and this is actually not what you want imho, a so you don’t want to create a positive pressure in the engine bay.

You want more cooling, so more air flowing thru the radiators. This higher flow of air can be achieved by increasing the frontal pressure, and create under pressure after the radiators. You can do this for instance with aerodynamic aerodynamic changes like a front splitter. Or more simpler, control your engine fans, to turn more often and faster.

This was just a completely uneducated random idea by me. I have no previous understanding of the fluid dynamics of engine compartments and radiator air flows.

I'm not sure what you mean by "creating under pressure" after the radiator. I'm assuming you are meaning a relative difference between the pressures of in front and behind the radiators, which we want to be as high as possible...am I correct?

Are you saying the ideal situation is for the air to come through the radiators and then hit the front of the engine and then go down and out and that this allows for the highest differential of pressures relative to the front and back of the radiators, thereby increasing the "sucking" of the air through the radiators?


How would we control the fans to come on sooner? Are there uprated fans that would drop in?
 

Last edited by Newby; Jun 9, 2012 at 10:07 AM.
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Old Jun 9, 2012 | 10:13 AM
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do what I am gunna be doing hard wire em and add a switch inside the cabin
 
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Old Jun 9, 2012 | 08:49 PM
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The vents would have to be toward the front of the hood, where the low pressure is. You can tape tufts of yarn all over and then go for a drive. You'll see where the low pressure areas are.
 
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