427 Cobra hood scoops

[my427cobra]

So Morris, it seems your middle close-up pic of the front of the hood scoop shows the yarn flowing INTO the hood scoop opening.

Too bad there hadn't been a few more tufts in front of the hood scoop opening.

And I would suggest about the side vents:

1) yarn placement as shown in the pic doesn't necessarily say no air is coming from the vents

2) the movement of the boundary layer along the side of the car at speed would be sufficient to draw (venturi effect) air out of the vent and given the air is hot and less dense would simply blend easily with the boundary layer and would not look like some kind of jet blast coming out of the vents.

3) a better test of the air coming out of the vents would be a smoke generator inside the fender or at least yarn place inside the vents to confirm the air flow.

4) keep in mind the bulk of the air exiting the engine compartment is down and under the car.

Just thinking.

Cheers
Greg

[my427cobra]

I should have also said the angle of the vanes in the vent also contributes to the venturi effect and how easily the air blends into the boundary layer.

Without the vanes, just a big hole would not be effective in sucking air out.

But great pics Morris.

All help in getting to the answer.

I'm going to do a similar test when I get my scoop mounted.

I'm also planning a static tuft test using 3 large box fans in front of the car while at rest.

Then of course a moving tuft test,

Cheers
Greg

[Morris]

Originally Posted by my427cobra

2) the movement of the boundary layer along the side of the car at speed would be sufficient to draw (venturi effect) air out of the vent and given the air is hot and less dense would simply blend easily with the boundary layer and would not look like some kind of jet blast coming out of the vents.

There is no boundary layer along the side of the car, because of the width of the front tires and fender.....that’s why the yarn is turbulent where the vent is....

The vent on the side of the body is to inboard of the front wheels & fender causing the boundary layer to not be attached to the body at that point....which was why I put the vents up on the hood so the boundary layer could draw the air out of the engine compartment.....thru the vents on the hood.