427 Cobra hood scoops

[my427cobra]

Hi Morris. You are right. Well, we're both right.

The air flow is disturbed by the wheel arch and the spinning wheel/tire, and separates from the body.

That puts the boundary layer into a series of vortexes over the vent area. Without actual smoke testing we might only be guessing what is happening to the air movement in the vent.

I'll tuft test it his weekend if it doesn't rain.

A vent in the hood a an excellent alternative.

Cheers
Greg

[my427cobra]

Tuft testing: let the fun begin!
So let’s use a casual engineering approach to this test in a form others easily can duplicate if they so choose so we can get comparative data.

Step 1: The static test
I’m going to start my car (motor idling so it heats up a little and so I don’t wear the battery down while running the fans) in the garage or in the driveway.

Again, a static test with the car at rest, not in motion.

I’m going to test two areas (I don’t have a hood scoop yet – coming this summer).
A) Side vents
I will attach tufts inside the wheel well ( driver side and passenger side) onto the vent vanes to see how they move when:
1) Front pusher fans only are ON
2) Rear puller fan only is ON

B) Radiator shroud/rear puller fan cage
I will attach tufts to the radiator shroud, rear puller fan cage, and a few places on the front of the engine to see how they move when:
1) Front pusher fans only are ON
2) Rear puller fan only is ON

All of this will give me a preliminary indication of where the air is moving while the car is static.

I am using this approach, because, when I’m driving the car and come to a stop sign, and my puller fan is ON, I can reach my left hand outside the car and forward to the vent, and I feel a large amount of air coming out of the vent.

I want to confirm this with tufts.

That’s my first step this weekend.

Next- Step 2: The moving test.

Stay tuned.

Cheers
Greg

[my427cobra]

And, as a static tuft test, pics should be easy.

Cheers
Greg

[my427cobra]

In parallel to the tuft testing, and in anticipation of my hood scoop installation, I am going to begin taking temperature readings of various engine compartment components for a couple of months (as the summer gets warmer) before the scoop and then after the scoop is installed to see if there is any relative improvement.

So here attached is a copy of the temperature measurement chart I will use.

I'm going to use my Harbor Freight Infra Red digital thermometer for the readings.


If anyone has any suggestions to add for measurement points, let me know.

Cheers
Greg

[my427cobra]

Yeah I know. Engineers can't spell. LOL

Cheers
Greg