Hood Ventilation Ideas
09-15-2007, 12:18 PM
#302
From Racing beats Water Cooling Tech tips:
"...Starting in 1993 the capacity of the stock cooling system was designed by Mazda to barely meet the needs of the stock car with no excess capacity for very demanding situations or modifications that increase the heat load on the engine. Based on a number of tests, we believe the primary cause of this problem is aerodynamic. In both the 1993-1995 RX-7 and RX-8, the air path out of the radiator is convoluted and restricted - leading to high water and oil temperatures. We have tried larger radiators, and to date, they have not helped. We have seen some improvement from improved sealing and directing the air into the radiator (using a spoiler lip under the vehicle) to create a lower pressure area under the car, to remove hot air."
The point Racing Beat is making is that the problem with the cooling system is evacuation of air from the engine bay to allow for more airflow through the radiator. They looked at trying to move more air out under the car (which is relatively high pressure). This mod is moving more air out of the engine bay through the rear of hood.
"...Starting in 1993 the capacity of the stock cooling system was designed by Mazda to barely meet the needs of the stock car with no excess capacity for very demanding situations or modifications that increase the heat load on the engine. Based on a number of tests, we believe the primary cause of this problem is aerodynamic. In both the 1993-1995 RX-7 and RX-8, the air path out of the radiator is convoluted and restricted - leading to high water and oil temperatures. We have tried larger radiators, and to date, they have not helped. We have seen some improvement from improved sealing and directing the air into the radiator (using a spoiler lip under the vehicle) to create a lower pressure area under the car, to remove hot air."
The point Racing Beat is making is that the problem with the cooling system is evacuation of air from the engine bay to allow for more airflow through the radiator. They looked at trying to move more air out under the car (which is relatively high pressure). This mod is moving more air out of the engine bay through the rear of hood.
Ahh. If I understand this correctly. The hood is sealed and all the high pressure air under the car is sucking the hot air through the radiator only and not from anywhere else to help cooling.
Last edited by Silver_Surfer; 09-15-2007 at 12:20 PM.
09-15-2007, 08:21 PM
#304
Thats why I stated above "This thread should become a sticky"
So maybe some of us can learn something.
Yes I did read the whole thing!
BUT, BUT. Why then are ALL vehicles hoods sealed from front to back? I'm sure millions of $$$ could have been saved by not putting all that weatherstripping on.
I first started on the side of the hood vented side from my old school days. Afterward............
09-16-2007, 11:59 PM
#305
Power!!
Most cars either don't have cooling issues or have better evacuation flow out the bottom or sides of the engine compartment. The reason this works is because Mazda didn't design the airflow out of the engine compartment adequately enough to begin with. If they had Rotorocks and MM wouldn't have had to come up with this. If the cooling air flow was better than most likely the engine compartment pressure would be lower and it wouldn't work. But the fact that it does is testament to the lack of air evacuation in the original design.
09-19-2007, 07:15 AM
#306
What I find funny is that Mazda's 2001 RX-8 concept car had a beautiful vented hood. It was like somebody at Mazda understood the issue, but the fix never made it into final production.
I would strongly consider buying such a hood. Would anybody know of any company making such a hood?
Note- The front opening made more sense too. Because on the concept car you would/could put the license plate below the opening. While on the production model the license plate blocks the opening unless you take it off, mount to the bottom, or have a folding license plate bracket. Also, the higher position may have meant a default designed cold air intake versus having to go to a 3rd party intake duct.
I would strongly consider buying such a hood. Would anybody know of any company making such a hood?
Note- The front opening made more sense too. Because on the concept car you would/could put the license plate below the opening. While on the production model the license plate blocks the opening unless you take it off, mount to the bottom, or have a folding license plate bracket. Also, the higher position may have meant a default designed cold air intake versus having to go to a 3rd party intake duct.
Last edited by sosonic; 09-19-2007 at 07:24 AM.
09-19-2007, 08:20 AM
#307
What I find funny is that Mazda's 2001 RX-8 concept car had a beautiful vented hood. It was like somebody at Mazda understood the issue, but the fix never made it into final production.
I would strongly consider buying such a hood. Would anybody know of any company making such a hood?
Note- The front opening made more sense too. Because on the concept car you would/could put the license plate below the opening. While on the production model the license plate blocks the opening unless you take it off, mount to the bottom, or have a folding license plate bracket. Also, the higher position may have meant a default designed cold air intake versus having to go to a 3rd party intake duct.
I would strongly consider buying such a hood. Would anybody know of any company making such a hood?
Note- The front opening made more sense too. Because on the concept car you would/could put the license plate below the opening. While on the production model the license plate blocks the opening unless you take it off, mount to the bottom, or have a folding license plate bracket. Also, the higher position may have meant a default designed cold air intake versus having to go to a 3rd party intake duct.
The opening on the production version is larger, no doubt. can we agree on that? It appears to have stretched downward taing out the surface area between it and the bottom opening - where you suggested a lic. plate could be mounted.
Go take a look at the grill area on your car. only the bottom 1/8th or so of the grill is actually opened. The rest is molded completely closed. This looks to be about the same size area as the original opening from the concept picture that you posted. Now If you take the bumper off you will see why the opening was enlarged downward and why the top of the grill is not open. It would not be functional for airflow anyway because of the crashbar and foam padding back behind it.
I don't live in a state that requires a front plate but I do live about 5 miles away from one that does. I have look at the possibility of ever needing to use that grill area to optimize my cooling, and I had a front plate I would mount my lic. plate under one of the headlights. Front plates look goofy anway so I don't think that would look any worse.
11-11-2008, 08:55 AM
#312
jersey fresh
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11-14-2008, 09:32 AM
#313
11-14-2008, 06:36 PM
#315
Finally Boosted!!!!!!!
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