Need to insulate a small harness from headers

[SSLance]

I've got a small harness with wires that run to the temp sensor, knock sensor, and oil pressure sender in it that runs very close to my driver side header near the oil filter. I can't seem to come up with a way to secure it to the block to hold it in place but in most cases it stays away from the header and does okay.

Over the past year the plastic sheathing it is in has melted away in a section about 2" long where it is closest to the header, but the wires themselves did not get damaged.

I'm trying to come up with a solution to wrap around the harness to protect the wires from the heat but am coming up empty. There really isn't any other way to route it as everything it connects to is also under the header. I can put new sheathing over it again and hope for the best maybe even adding a layer or two of electrical tape, but would like to try something a bit more permanent.

Any suggestions?

Something like the metal tube on the passenger side for the wires coming off of the starter would be great, but there is nothing to attach it to to hold it in place that I can see.

What I'd like is some sort of insulating tape that I could wrap the harness up in...is there such a thing?

[Ron in SoCal]

Lance - DEI makes lots of cool stuff. You could use header wrap or maybe soemthing like this?

http://www.designengineering.com/cat...ltra-sheath-ma

Hope it helps.

[Sieg]

I've used this from Summit combined with a little sewing to seal edges or banding with foil tape and securing with foil tape or safety wire it gets the job done. Can you can make a stand-off bracket to attach the wires to and keep them as far away from the heat source as slack will allow?

[craig510]

http://www.summitracing.com/parts/dei-010425/overview/

http://www.summitracing.com/parts/hsp-340210/overview/


A combination of these or similar products will do the job. I used a bunch anywhere were my wires or brake/clutch lines got close to the headers and it has help up well for over 3 years. You can split to cool tube and slip it over existing wires or feed them through.

Good Luck.

[Flash68]

You can get all kinds of the NASCAR used fire sleeve stuff on ebay for pennies.

[Revved]

Yep... some sort of thermal sleeving. Thermotec makes Thermosleeve in all different sizes and I'm not sure if it is their product but I've seen one that had a velcro closure somewhere. I know they make thermal tape or wrap it and secure with steel zip ties.

[SSLance]

Thanks for the suggestions everyone, O'Reilly has a 3' length of the DEI 3/4" heat shield and some Cool Tape in stock so I was able to get it all back together today.

Here is what happened to the last harness that was in the place



Thankfully the wires inside it were untouched.

This is the one I was most concerned about, the oil pressure sender circuit.



The rest of the harness that goes forward under the header, now protected by the DEI loom and cool tape.



I was able to form the shielding to aim it away from the header and I'm certain it'll work great now.

I knew it was close before and I watched it all season long, only near the end of the year did it finally melt a hole through the casing. I feel a lot better about how it is now.