Radiator airflow - above or below?
Imagine if you will that your car has an engine behind the driver and a radiator up front in the nose.
In a perfect world of choices, do you vent the rad into the airflow above the hood, or under the car? Below is a video where they chose to dump the air under the car. Just watch it for a few seconds, sorry about the ad. https://youtu.be/63-oQq6XLhI?t=164 And below is venting for a front mounted oil cooler, a situation seen on many exotic racing cars (radiator typically) going back to the 1960's. My version of the thru the hood venting... - Pelican Parts Forums http://forums.pelicanparts.com/uploa...1302736800.jpg http://forums.pelicanparts.com/uploa...1302736831.jpg I imagine that dumping air below into an already compressed and often disrupted airflow and under low flow high pressure as shown in the first example with video is better than introducing more flow over the hood - up to a point. That point comes at high speed...........guessing normal highway speeds and beyond where uplift can be a problem. At that point, safely and handling trump smooth aero over the top of the car's hood. Down-force, it's a good thing in moderation. Above or below, that is the question. |
No need to imagine anything. My dad first car - Skoda 105 - had exactly this setup. Rear engine, front radiator, air vented under the car. The reason behind was generous luggage space (boot) in the front. The price was (well known) lift on the front axle at high speeds. But, hardly anyone drove more than 80 km/h at these times anyway. (there was a joke that 105 does not refer to engine ccm, but top speed, downhill with rear wind)
Some Triumphs have vented through wheel well, iirc |
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My course instructor drove a Miata back home and had three of us students in a Skota on some country roads near the Polish border. He said the handling was great considering how much weight we had in the car. I suspect the downward venting Porsche is a burning tire patch 0-60 car based on the early part of the video. I don't think this was intended as a high speed track car, rather it is an attention getting tire smoker. The only down force he is concerned about is his foot on the gas pedal. |
Hucho would vent the radiator airflow over the bonnet
Vekke had such a set-up on his Seat Ibizanope, make that a Cordoba station wagon https://ch3301files.storage.live.com...36&height=1152 |
above or below
For the 1976-78 CNR 'banana' car,Morelli and Pininfarina did both.
Four extractors,2-up,2-down,were positioned,oriented,and sized,such that the air escaped into lower pressure air,blending at exactly the same velocity as the adjoining air stream,for a 'seamless' merge,and lowest drag. It's the best cooling system I've ever seen for a 'passenger' car. For racing cars,the Olds AEROTECH would represent a good illustration of ideally-ducted,airtight design.(it's a ground-effect car,so all aspirations occur on the upper body). |
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And I bet you felt like in some wild dream set 40 years back. |
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I was told it changed quite a bit from just a year or two prior by one of my classmates, I can only imagine the pace picked up even more after I left. I loved that it was not spolied but did eat at the New York Pizza and McDonalds near the end of the six weeks. Only so much goulash an American can eat. I do remember the pivo, Děkuji. Regarding the topic, I wonder if the Aerotech intakes and exhausts would work half as well under the belly. Photos of 290mph speed record shattering Oldsmobile “Aerotech” : theCHIVE http://forums.pelicanparts.com/uploa...1541289768.jpg https://thechive.files.wordpress.com...o&w=641&zoom=2 FYI: Aerohead, some of our old Photobucket images seem to be reappearing. https://ecomodder.com/forum/showthre...e-29689-6.html Quote:
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Click on the images in this website link below, they get huge and you can see every detail of the "banana car". Concept Car of the Week: Pininfarina CNR-PF (1978) by Rufus Thompson 12 Oct 2012 https://cardesignnews.com/media/impo...86/252086.html |
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