Printable Version of Topic

Click here to view this topic in its original format

914World.com _ 914World Garage _ Ducts for engine cooling

Posted by: groot Aug 28 2005, 09:14 AM

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)

Posted by: groot Aug 28 2005, 09:15 AM

Under side of modified NACA duct attached to the turn signal opening:

Attached image(s)

Posted by: groot Aug 28 2005, 09:16 AM

Into the fan housing....

Attached image(s)

Posted by: groot Aug 28 2005, 09:17 AM

Another view of the hose running in the front fender:

Attached image(s)

Posted by: Headrage Aug 28 2005, 09:17 AM

How do you get it all the way to the engine compartment? Through the rocker panels, passenger compartment??

Posted by: groot Aug 28 2005, 09:19 AM

Passenger compartment.... maybe not the best option for a street car.

Posted by: Racer Chris Aug 28 2005, 08:34 PM

Good deal Kevin, looks like a winner!

Posted by: Aaron Cox Aug 28 2005, 08:41 PM

easier than a naca duct in the rear qtr??

looks good

Posted by: Racer Chris Aug 28 2005, 09:27 PM

QUOTE (Aaron Cox @ Aug 28 2005, 10:41 PM)
easier than a naca duct in the rear qtr??

looks good

We're only allowed to use existing openings in the bodywork Aaron. Tends to complicate things a bit.

Posted by: Brett W Aug 28 2005, 09:46 PM

Do your tires not hit the ducts in bump and roll?

Posted by: maf914 Aug 29 2005, 06:52 AM

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.

Posted by: URY914 Aug 29 2005, 07:09 AM

Nice work. The sheetmental duct at the engine inlet is a good chose.

Paul

Posted by: groot Aug 29 2005, 07:17 AM

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.