You said this is a vinyl product right? What is the melting temp of it?

I seriously doubt temperature would be an issue. People put vinyl graphics on hoods all the time without it melting.
Besides, if your engine bay temps melt something on the outside of the hood, you got bigger problems.
And Wren said it was more for storage, not daily driving.

Anyone know how hot a black piece of vinyl gets on the door of a car? In summer and direct sunlight, pretty damn hot. Too hot to touch for sure. But they make these that way anyway.

In addition, underhood temps in the winter are far cooler, especially while driving. Zilla will be down most of the winter anyway, which is why I want these (considering the car will be outside during the motor work).

The vents themselves are also plastic, and neither them nor the primer on them has ever shown any evidence of heat damage. I could check the temp of the air coming out the vents if anyone were curious, but it'* going to be totally different in summer (when I wouldn't want to run these anyway).

I'll get some daylight pics up a little later. Still dark here.

Vinyl is good to about 200 F and engine bay temps won't be much over 180F heat soaked on a hot summer day, unless you are overheating........the rain should cool it significantly.

Good job bill! Can we make a set sometime for Gravenge?

Sure can do, John. The whole process only took a couple liesurely hours (7-beer job).

Here'* some better sort-of daylight pics:









All you need is some adhesive-backed strip magnets (flexible) from a craft or hardware store. I used 1/2" wide, and also a sheet of material. You don't have to use the magnetic flexible vinyl like I did. But it does come in white.

Go to www.mcmaster.com and search for magnetic sheets or flexible magnets.

You could even use simple cutouts of polycarbonate or acrylic, shape them the same with the magnets, scuff them, and paint them. They'd be thicker though. I have noticed that mine sag just a little across the vent, so you probably don't want to go thinner than the magnetic door sign material I used unless you don't care about looks. You can see in the closeups that I had to double-stack the strips (carefully orienting them so they'd naturally stick together magnetically as well), overlapping the corners opposite each other. That gave me enough height to clear the vent. One strip thickness was just a LITTLE short. If you buy some thicker stuff, you can do it in one shot.

So have you speed tested them yet?

Probably will later today. The test piece held on well at 85.

Just had a horrible idea. Doesn't one of your air rams in the front go under the hood. Will the engine bay be under pressure at speed?

Yes it is under pressure with or without the ram air tube. That'* what makes the vents work so well.
The question will be, is this pressure high enough to overcome the magnet force of the caps.
The test piece did not cover the entire vent.