 NACA duct(s) on rear decklid?, Anyone have 1st hand experiance here? |
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| Mueller |
 Feb 12 2020, 08:24 PM
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#1
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914 Freak!  Group: Members Posts: 17,155 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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Pondering adding NACA ducting to rear deck lid for additional cooling of a radiator.
Already figured out the exhausting of said cooling air. Just don't know it the air off the targa roof would reach ducts or flow over. |
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| stownsen914 |
Feb 12 2020, 08:31 PM
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#2
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Senior Member Group: Members Posts: 957 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
NACA ducts work best with laminar attached airflow, like on a front hood for example. The rear decklid area on a 914 has turbulent flow due to the dropoff after the roof, so I wouldn't think it's the best place for a NACA unfortunately.
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| RickS |
Feb 12 2020, 08:40 PM
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#3
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Senior Member Group: Members Posts: 1,408 Joined: 17-April 06 From: 'False City', WA Member No.: 5,880 Region Association: None |
Always thought NACA or something similar in the sides/wings of targa bar, would help direct airflow to the engine.
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| Retroracer |
Feb 12 2020, 09:14 PM
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#4
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Senior Member Group: Members Posts: 640 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest
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@Mueller check out Tylers installation:
https://flatsixes.com/cars/porsche-914/this...orsche-passion/  - Tony . |
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| sixnotfour |
Feb 12 2020, 09:24 PM
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#5
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914 Wizard Group: Members Posts: 10,904 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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Good Luck ...he got his claim to with the video....does not respond...I too have a rear mounted oil cooler........
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| GregAmy |
Feb 12 2020, 09:56 PM
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#6
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Advanced Member Group: Members Posts: 2,504 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(stownsen914 @ Feb 12 2020, 09:31 PM)  NACA ducts work best with laminar attached airflow, like on a front hood for example. The rear decklid area on a 914 has turbulent flow due to the dropoff after the roof, so I wouldn't think it's the best place for a NACA unfortunately. (IMG:style_emoticons/default/agree.gif) Unless you have laminar flow, NACA is a waste. May as well attach one of those roof scoops from the Baja Bugs. |
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| Mueller |
Feb 12 2020, 10:58 PM
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#7
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914 Freak! Group: Members Posts: 17,155 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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Thanks, I was afraid that was a bad idea. They do look cool back there.
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