Wiring Shield Materials

Hi, I'm currently working on Formula Student Cars and we want to make sure our wiring harness is not melting and is kept safe where it's in the engine bay, so we think we need to cover it with an extra layer that has good heat resistance, but for the consideration of good application as well as reduce cost materials, which one we can use is t need to have heat resistance cable heat sleeving or is it enough to have DR - 25 heat shrink with expandable braid sheathing? Or do you guys have other preferences for us to know? Thankyou.

Different insulation has different 'maximum' operating temperatures depending on current, ambient temperatures, and whether they're free or in a loom.

Best option is to see what you can do about getting proper "motorsport" wiring, as the insulation has a much higher temperature rating than the common PVC - you may get it for free as a sponsorship deal. Next option may be to plan the routing so it avoids higher heat - radiant, convection/air or direct - and the last might be the heat shielding you have in mind. This could be thin heat shields - such as shim stock, thermal barrier paint, sleeving, etc.

You mention the last, but what sort do you have in mind? The fiberglass weave type should be reasonably cheap, and to the job well, especially if there is an air-gap within.

How close will it be to the heat source, how hot is it, and for how long?