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> Opinions on a Different Oil Cooler Position
majkos
post Oct 26 2011, 07:13 PM
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QUOTE

Ye gods, I'm glad I typed all that before the cold meds really took effect. (IMG:style_emoticons/default/lol-2.gif)



Yup, and thank God for spell check.
Took me a couple of times to read what the hell ya wrote.
My meds has kick in (IMG:style_emoticons/default/smoke.gif)
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URY914
post Oct 26 2011, 07:16 PM
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Air exiting under the car is never ideal.
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Madswede
post Oct 26 2011, 07:58 PM
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QUOTE(URY914 @ Oct 26 2011, 07:16 PM) *

Air exiting under the car is never ideal.

(IMG:style_emoticons/default/confused24.gif) Care to elaborate?
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URY914
post Oct 26 2011, 08:07 PM
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Air under the car means lift. Air on top of the car is downforce. Simple really.
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Madswede
post Oct 26 2011, 08:16 PM
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Understood, but my thoughts were based on existing flow for the car's design. Not much needed for what I was talking about. Certainly an oil cooler vent will not change the airflow under a 914 to the extent that it lifts. Doubt the GT would have been so successful otherwise.
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carr914
post Oct 26 2011, 08:35 PM
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I believe the GT was successful mainly because it was a Mid-Engined car. The guys at Porsche were throwing things at it without really knowing the outcome - ie the Rear Strengthening Kit, it really doesn't do much. Same for boxing the Trailing Arms. A good correlation is the 917 that was made in the era of the 914. Yeah it would do 250mph, but couldn't keep going in a straight line. The Porsche Drivers were truly scared to drive it. Porsche tried Long-Tails, Short-Tails, Kamm-Tails. It took them a long time to figure it out and by the time they did, the 917 was obsolete.

In this case ( the Front Oil Cooler), they needed to cool the Engine ( it is called Air-Cooled, but is also Oil-Cooled) so they stuck an Oil Cooler where it would be in the Wind.

However a 914 is really a Very Unstable car at High Speeds. Approaching 120mph, the Rear of the car wants to lift off the ground.
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Madswede
post Oct 26 2011, 08:42 PM
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Interesting points. Thanks guys for indulging my engineering geekiness. (IMG:style_emoticons/default/beerchug.gif)
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carr914
post Oct 26 2011, 08:55 PM
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QUOTE(URY914 @ Oct 26 2011, 10:07 PM) *

Air under the car means lift. Air on top of the car is downforce. Simple really.


And Ground- Effects is sucking any air out from under the car and creating Wings/Foils to creat downforce.

Jim Hall of the Chapparals is a Genius - The Sucker car ( that had side pieces that went the ground to keep air out and 2 Fans powered by a Snowmbile engine to suck out air), Huge Wings that moved, I believe he was the 1st to put louvers on top of the front fenders to relieve air pressure. He also used Sequential Automatic Trannies to save time during shifts - all of this was in the 60's. They Banned some of his cars because they were so radical and Too GOOD

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Eric_Shea
post Oct 26 2011, 09:09 PM
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Here's one for the engineers; How much lift does a GT oil cooler cause and, at what speed? (IMG:style_emoticons/default/confused24.gif)
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Eric_Shea
post Oct 26 2011, 09:11 PM
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...and; would the air hitting that portion of the front bumper have gone over or under the car naturally (or both)? (IMG:style_emoticons/default/idea.gif)
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Mike Bellis
post Oct 26 2011, 09:22 PM
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My car is suprisingly stable at 120mph. Don't ask how I know (IMG:style_emoticons/default/biggrin.gif) I do have a shitty wing on the back. It is lower than ideal but I can feel a remarkable difference at speed. My radiator is vented through the fenderwells with the intake in the bumper. I have an air dam and the car is very low. Minimal air is traveling under the car.

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URY914
post Oct 27 2011, 09:22 AM
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QUOTE(Eric_Shea @ Oct 26 2011, 08:09 PM) *

Here's one for the engineers; How much lift does a GT oil cooler cause and, at what speed? (IMG:style_emoticons/default/confused24.gif)


Some and when going fast.
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r_towle
post Oct 27 2011, 11:05 AM
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Just to add another thought.
We put a cooler in a horizontal position, strapped to the engine mount bar (on a /4 motor)
Passenger side, no fan assist.
Did a great job of keeping the temps down.
Interesting air flow in that area with the two little plastic flapper pieces in place on the bottom of the firewall.

Rich
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chris914
post Oct 27 2011, 11:36 AM
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QUOTE(Eric_Shea @ Oct 26 2011, 08:11 PM) *

...and; would the air hitting that portion of the front bumper have gone over or under the car naturally (or both)? (IMG:style_emoticons/default/idea.gif)


Yes, it would go under naturally, unless you have an air dam across the front of the car.

So for a car without a front air dam it really doesn’t matter where the air comes out, bottom, sides, or top. Drag (which makes you go slower) created by the opening up front for the oil cooler is much more of a concern really.

http://www.cassidy-online.com/porsche914/a...side_top_up.WMV
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