Hood Ventilation Ideas
#102
RotoRocks Powered
Thread Starter
WOW, it's easy to just drop something like that.
What is so ignorant about this?
Perhaps you would you like to indulge us with your view and understanding of the correct purpose of the cover? Something that is based on the pure facts ad not speculation please?
Or are you going to counter the fact that the hit energy can be transmitted via other means than matter to matter?
But then again, your opinion in this forums is aways sided with the opinion of the majority. I have never seen you to post anything more that a smirky comment, that has something similar in content. It is either that, or you just sit there quietly with your mouth shut, pretending to look smart.
Let's hear the voice of the genius
What is so ignorant about this?
Perhaps you would you like to indulge us with your view and understanding of the correct purpose of the cover? Something that is based on the pure facts ad not speculation please?
Or are you going to counter the fact that the hit energy can be transmitted via other means than matter to matter?
But then again, your opinion in this forums is aways sided with the opinion of the majority. I have never seen you to post anything more that a smirky comment, that has something similar in content. It is either that, or you just sit there quietly with your mouth shut, pretending to look smart.
Let's hear the voice of the genius
#104
Carbonormous
Join Date: Aug 2003
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I'm not defending anyone but if you're going to ask anyone for proof you should be prepared yourself. Where is the flaking, peeling, faded, whatever hood? And further more you'll have to prove that it's because the engine cover was off, not oxidation, abuse, or any other variable.
Everyone gets so defensive and hot headed for nothing but a little testosterone rush. If you're wrong you're wrong. If you can't prove something and believe it anyway, good for you.
Edit: And yes the felt is for heat but more so noise. The cover does nothing. Ok, that's a lie, it looks nice to some people.
Everyone gets so defensive and hot headed for nothing but a little testosterone rush. If you're wrong you're wrong. If you can't prove something and believe it anyway, good for you.
Edit: And yes the felt is for heat but more so noise. The cover does nothing. Ok, that's a lie, it looks nice to some people.
Last edited by savedsol; 08-04-2007 at 01:20 PM.
#106
RotoRocks Powered
Thread Starter
Yep, that was actually my other thought.
It is there just to look pretty.
But it will provide an additional level of shielding from heat produced by the engine.
I stated what I reasonably believe to be true. Everyone is entitled to think differently.
I was called ignorant without any explanation or reason.
That was just rude. If I am wrong, offer me a reasonable explanation why, i am wrong. I nave no problem accepting other people opinions.
We had disagreements with MM, CRH, Mysql before but never at any point we called each other ignorant or anything like that. we argued and defended out opinions, ad it was informational. Ind in some cases I was wrong, and I admitted it without any problems.
And there you go yourself saying what i said in my original post...
Last edited by rotorocks; 08-04-2007 at 03:09 PM.
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JoeBlow (08-12-2021)
#108
Carbonormous
Join Date: Aug 2003
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Uh... your reading comprehension skills might be worse than mine. Nobody said you were wrong. Likewise, nobody said you were right. I'm signing out right... here.
#109
RotoRocks Powered
Thread Starter
Some conflict mediator you are
Consider your responses more carefully next time, and people will have no trouble comprehending.
You gotta love it! Come up with something that's beneficial to others and in return they call you at first a *****, then ignorant, and on top of that it turns out that my comprehension skills are not there. WTF?
#111
RotoRocks Powered
Thread Starter
Some got real pissed off because it would make them look stupid to drop $800 on a CF vented hood, using an excuse that it provides improved cooling. Now they'll just have to do it for rice.
#112
The Professor
Im open to logical discussions.
One more thing to consider is that under the car is not the low pressure zone, under the car is the high pressure zone. So, naturally air will be wicked up to the lower pressure faster moving air going over the top of the body of the car. Thats just common sense. Thats how airplanes fly, and after all a car is merely a wing shape that never leaves the ground.
airplanes fly because they have high pressure on the bottom of the wing because the air has no obstructions as it passes under the wing. But since the top of the wing has a large bump on it air wants to move more quickly over this bump to exit at the same rtime as the air going under the car. As the air moves quickly though space it spreads out and becomes less dense, this is what is called a low pressure system, and this is what the entire top of the car is in comparison to the underside of the car. Air moves from high pressure to low pressure, never the other way around.
Now in airplanes and some very fast cars, the high pressure under the car becomes so great that it can lift the thing off the ground, almost like magic.
Therefore, air wants to move out the hood toward the top of the car. But though clever ducting and blockoffs we channel this under the car to cool the catalytic converter and tranny.
but generally air wants to move out the hood, and generally we like cool engines and transmissions, which is why the engine cover is in place, to divert air trying to excape the hood down to cool the headers and the coils.
but seriously, if you want to prove it, just buy some dry ice or a smoke bomb, put them in your undertray in front of the radiator and see where the smoke comes out with/without spacers.
One more thing to consider is that under the car is not the low pressure zone, under the car is the high pressure zone. So, naturally air will be wicked up to the lower pressure faster moving air going over the top of the body of the car. Thats just common sense. Thats how airplanes fly, and after all a car is merely a wing shape that never leaves the ground.
airplanes fly because they have high pressure on the bottom of the wing because the air has no obstructions as it passes under the wing. But since the top of the wing has a large bump on it air wants to move more quickly over this bump to exit at the same rtime as the air going under the car. As the air moves quickly though space it spreads out and becomes less dense, this is what is called a low pressure system, and this is what the entire top of the car is in comparison to the underside of the car. Air moves from high pressure to low pressure, never the other way around.
Now in airplanes and some very fast cars, the high pressure under the car becomes so great that it can lift the thing off the ground, almost like magic.
Therefore, air wants to move out the hood toward the top of the car. But though clever ducting and blockoffs we channel this under the car to cool the catalytic converter and tranny.
but generally air wants to move out the hood, and generally we like cool engines and transmissions, which is why the engine cover is in place, to divert air trying to excape the hood down to cool the headers and the coils.
but seriously, if you want to prove it, just buy some dry ice or a smoke bomb, put them in your undertray in front of the radiator and see where the smoke comes out with/without spacers.
Last edited by staticlag; 08-04-2007 at 07:01 PM.
#113
Power!!
#115
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airplanes and race cars go real fast. in 45mph traffic and idling in slow traffic--airflow is a different animal.
When I come off a track session the engine bay temp is very mild--hell the cooling fans dont even come on when i park it.
When I drive home from work with the a/c on etc, the cooling fans come on when I park and if you lift the hood--- it is hot--- real hot, surface temp on coil packs at 160-170F.
So-i did this little mod and repeated a drive home on a 95f day in georgia. Surface temps on my coil pack was 150-160F . Thats enough for me, Aint worried about the small part of paint on the hood that MAY get a little warmer---hell my dash gets 150F!
This is one mod I say "Good job" this one works!
olddragger
When I come off a track session the engine bay temp is very mild--hell the cooling fans dont even come on when i park it.
When I drive home from work with the a/c on etc, the cooling fans come on when I park and if you lift the hood--- it is hot--- real hot, surface temp on coil packs at 160-170F.
So-i did this little mod and repeated a drive home on a 95f day in georgia. Surface temps on my coil pack was 150-160F . Thats enough for me, Aint worried about the small part of paint on the hood that MAY get a little warmer---hell my dash gets 150F!
This is one mod I say "Good job" this one works!
olddragger
#117
Registered
iTrader: (3)
come--- on check us out anytime. We are at Road Atlanta running laps at around 1:50s, Roebling Road lapping at 1:26 or so. Maybe our gearing is a little better, keeping the rpms down? Ya think? Coolant temps on track are around 220F, oil temps 220 to 230F. Even on a 100f ambient day.
you are welcome to join us anytime.
olddragger
you are welcome to join us anytime.
olddragger
#120
Boosted Kiwi
iTrader: (2)
come--- on check us out anytime. We are at Road Atlanta running laps at around 1:50s, Roebling Road lapping at 1:26 or so. Maybe our gearing is a little better, keeping the rpms down? Ya think? Coolant temps on track are around 220F, oil temps 220 to 230F. Even on a 100f ambient day.
you are welcome to join us anytime.
olddragger
you are welcome to join us anytime.
olddragger
#122
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Join Date: Jul 2007
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The other problem with that theory is when you apply it to thin wings.
Now in airplanes and some very fast cars, the high pressure under the car becomes so great that it can lift the thing off the ground, almost like magic.
Therefore, air wants to move out the hood toward the top of the car. But though clever ducting and blockoffs we channel this under the car to cool the catalytic converter and tranny.
but generally air wants to move out the hood, and generally we like cool engines and transmissions, which is why the engine cover is in place, to divert air trying to excape the hood down to cool the headers and the coils.
The engine cover is a pretty piece of trim, but it does no work in directing air - the underboonet air is not flowing nicely, it is all turbulence in there - the stock bonnet would perform the same role in directing air as the engine cover. The engine cover is there because without it that area looks like ***, same reason some ugly V8s have them, same reason Ferraris, Veyrons and Supras (OK, I'm biased in that regard ) don't have engine covers like that (just trim pieces to cover our ugly plugs/coilpacks)
If all you want is to keep the underbonnet temps down during slow/regular driving or when the car is stopped, then any topside vents would help.
#123
Power!!
Here's a proper explanation of lift over an airfoil and the typical theories used to describe it.
http://travel.howstuffworks.com/airplane5.htm
I agree the most effective ducting would be directed at removing the air from behind the radiator ala lotus Elise or Ferrari F50. Having a duct and exit vent from right behind the radiator and ditto for the oil coolers.
http://travel.howstuffworks.com/airplane5.htm
I agree the most effective ducting would be directed at removing the air from behind the radiator ala lotus Elise or Ferrari F50. Having a duct and exit vent from right behind the radiator and ditto for the oil coolers.
#124
So what about washing your car or intense rain after doing this mod? Are you allowing water to get into your engine bay?
Of course you could do this like expo1, where you can screw on and screw off the bumpers. Note- Also black bumpers would look better.
https://www.rx8club.com/attachment.p...5&d=1186341710
Of course you could do this like expo1, where you can screw on and screw off the bumpers. Note- Also black bumpers would look better.
https://www.rx8club.com/attachment.p...5&d=1186341710
Last edited by sosonic; 08-09-2007 at 01:07 AM.