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Old 05-30-2019, 01:21 PM   #1 (permalink)
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NASCAR cooling drag

Surprisingly in-depth article from Jalopnik on NASCAR cooling systems, cooling drag, grill blocking (with tape!), and intake air temperatures: https://jalopnik.com/the-fascinating...hot-1835071544

The article was spurred by this video, where you can see some of their ducting setups, etc.: https://www.youtube.com/watch?time_c...&v=3LuS7eK3o64

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Old 05-30-2019, 01:26 PM   #2 (permalink)
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Somewhere in the distant past posts here on EcoModder, someone mentioned that with a fully ducted cooling system with optimal intake and exhaust vents, you can cool a 100HP with just a 16 sq in opening. So, 200HP could be cooled with 32 sq in, and so on.
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Old 05-30-2019, 02:00 PM   #3 (permalink)
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Didn't read the article yet, but I think that's why there is a lot of strategy in drafting. Too much being in the draft, and you risk overheating the engine. There's a ton of strategy in NASCAR that isn't readily apparent. I wish there was an alternate audio channel that focuses on the science/strategy of racing rather than the mostly "hype" chatter. Maybe even mic up the team engineers.
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Old 05-30-2019, 05:28 PM   #4 (permalink)
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why not take advantage of the Meredith effect, an aluminum roof with tubes welded to the inside would provide significant cooling and not only drag reduction but could potentially even add thrust

something like an inside out P51 radiator

it something that could even be useful for some of the more advanced fabricators here
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Old 05-30-2019, 06:17 PM   #5 (permalink)
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Quote:
Originally Posted by ASV View Post
why not take advantage of the Meredith effect, an aluminum roof with tubes welded to the inside would provide significant cooling and not only drag reduction but could potentially even add thrust
Even though NASCAR cars are already well outside the "stock" cars they represent, a radiator/cooling system like that would definitely not be considered stock. I like the outside the box thinking though.
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Old 06-01-2019, 01:31 PM   #6 (permalink)
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cooling/Meridith effect

Quote:
Originally Posted by ASV View Post
why not take advantage of the Meredith effect, an aluminum roof with tubes welded to the inside would provide significant cooling and not only drag reduction but could potentially even add thrust

something like an inside out P51 radiator

it something that could even be useful for some of the more advanced fabricators here
IVECO has used the bonded-tube heat-exchanger on the cab-to-trailer gap-filler panels,for their 'Glider' truck tractor.It's basically 'grilleless.'
As to the Meredith effect,this may be something which would only work in transonic flow,where the air would be experiencing compressive effects.The NASCAR racers would have to be doing a minimum of 250-mph,before they'd see any compressive flow.The expanded flow off the radiator would have nothing to 'push' against.
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Old 06-02-2019, 03:19 AM   #7 (permalink)
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Quote:
Originally Posted by ASV
why not take advantage of the Meredith effect, an aluminum roof with tubes welded to the inside would provide significant cooling and not only drag reduction but could potentially even add thrust

something like an inside out P51 radiator

it something that could even be useful for some of the more advanced fabricators here
I gave it my best shot here:



The one on the left. It would have a 4-into-2-into-1 exhaust header with a 90 elbow instead of a megaphone, topped by a stainless steel Coanda nozzle fed with 1500cfm of exhaust and/or 1500cfm of engine cooling air.

This would pull the air flowing along the sides inward at the truncation and add energy to it.
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Old 06-02-2019, 03:24 PM   #8 (permalink)
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Problem is that it still has to work in stop and go traffic with the A/C on.

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