 Ducts for engine cooling, To get those CHTs in control |
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| groot |
 Aug 28 2005, 09:14 AM
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#1
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Dis member  Group: Members Posts: 894 Joined: 17-December 03 From: Michigan Member No.: 1,444  |
In another thread some of us discussed a variety of methods to get fresh, cool air to the engine to assist in engine cooling.
I ran this setup at M-O last weekend and my CHTs dropped to under 400 degrees for the first time since my engine rebuild. Before these ducts, I could only run 1 or 2 hot laps before my CHTs got too hot. Now, I can run 20 laps at M-O and the temps stay under 400 degrees. 2-3" ducts from each turn signal opening. Front view with the fender off: Attached image(s) 
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| groot |
Aug 28 2005, 09:15 AM
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#2
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Dis member Group: Members Posts: 894 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Under side of modified NACA duct attached to the turn signal opening:
Attached image(s) 
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| groot |
Aug 28 2005, 09:16 AM
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#3
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Dis member Group: Members Posts: 894 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Into the fan housing....
Attached image(s) 
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| groot |
Aug 28 2005, 09:17 AM
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#4
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Dis member Group: Members Posts: 894 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Another view of the hose running in the front fender:
Attached image(s) 
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| Allan |
Aug 28 2005, 09:17 AM
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#5
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Teenerless Weenie Group: Members Posts: 8,373 Joined: 5-July 04 From: Western Mesopotamia Member No.: 2,304 Region Association: Southern California |
How do you get it all the way to the engine compartment? Through the rocker panels, passenger compartment??
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| groot |
Aug 28 2005, 09:19 AM
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#6
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Dis member Group: Members Posts: 894 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Passenger compartment.... maybe not the best option for a street car.
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| ChrisFoley |
Aug 28 2005, 08:34 PM
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#7
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I am Tangerine Racing Group: Members Posts: 7,922 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
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Good deal Kevin, looks like a winner!
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| Aaron Cox |
Aug 28 2005, 08:41 PM
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#8
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
easier than a naca duct in the rear qtr?? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)
looks good |
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| ChrisFoley |
Aug 28 2005, 09:27 PM
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#9
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I am Tangerine Racing Group: Members Posts: 7,922 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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We're only allowed to use existing openings in the bodywork Aaron. Tends to complicate things a bit. |
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| Brett W |
Aug 28 2005, 09:46 PM
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#10
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Advanced Member Group: Members Posts: 2,856 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None
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Do your tires not hit the ducts in bump and roll?
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| maf914 |
Aug 29 2005, 06:52 AM
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#11
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None
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I remember seeing Bob Kirby's black 914 at the runoffs when they were last held at Road Atlanta (a few years ago!). His car had a round duct routed from the front trunk to the engine fan inlet and a fan with no or few blades. In the front trunk there were rectangular ducts in a Y-shape feeding the round duct from the headlight buckets. Similar concept to Kevin's.
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| URY914 |
Aug 29 2005, 07:09 AM
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#12
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,411 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Nice work. The sheetmental duct at the engine inlet is a good chose.
Paul |
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| groot |
Aug 29 2005, 07:17 AM
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#13
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Dis member Group: Members Posts: 894 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
No interference... I'm running a bit more ground clearance than you're planning, ~4" in the front. I need to run this much to give me 1.25" of travel before the jounce bumper comes in. My strut could be a little shorter to give me more travel, but I'm living with what I have for now.
Many SCCA 914 have the sewer duct, but my package layout does not allow me to run one through the middle of the car. |
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