Exhaust insulation

[Simon B]

I've got an exhaust passing a little too close to some wiring, is there an insulation wrap I can put on that will expose my wiring to less heat? If so what and where from?

[western]

exhaust wrap here may do the job.

[Simon B]

exhaust wrap here may do the job.

Cheers Western, thats poor googling on my part. My next job is to find cheaper pipework than silicone or give up and sell loads of stuff to buy silicone!?

[FridgeFreezer]

Bear in mind that wrap is a pain in the backside - it absorbs water (esp. offroad) and mud which can lead to steamy windows offroad, and a rusty exhaust more quickly if it's mild steel.

Oh and the glass strands stick in your hands when you're working on the vehicle.

I bought a set of tubular headers with it on, not fitted anymore

[Tango59]

I would try to wrap the loom and fit a heat shield if possible goodridge make some wrap fore hoses and stuff

[rick]

Bear in mind that wrap is a pain in the backside - it absorbs water (esp. offroad) and mud which can lead to steamy windows offroad, and a rusty exhaust more quickly if it's mild steel.

Oh and the glass strands stick in your hands when you're working on the vehicle.

I bought a set of tubular headers with it on, not fitted anymore

Good wrap should be silica based, not fibre glass so you shouldn't get any glass stuck in hand syndrome

I run Thermotec header wrap from the dump pipe of a the 300Td all the way to the back of the t/case and it works well.

To waterproof it you either use their silicon based aerosol sealant paint, or if cheap like me use a silicon based high temp paint (I had some matt black stuff) and give it a liberal going over with that.

Mines been on for 40,000km now and still looks fine.

[FridgeFreezer]

TBH I was never overly convinced of any great benefit of the stuff, making a very hot thing a bit less hot still makes it too hot for wires to be near.

[rick]

Fair enough, and to be honest I'd rather run a good ceramic based coating to reduce temps but I had rolls on the shelf left over from racing days many years ago, discussed the potential problems (eg potential fatigue cracking) with an ex-marine diesel fitter that told of the extensive use in the big marine diesels he worked on (from the turbo's back) so went ahead and wrapped the dump pipe.

Made a huge difference to heat infiltration into the cabin (what I was mainly after) and reduced a little noise too from the 3" pipe.

Interesting to note that when talking to a 4wd exhaust system manufacturer here, they accidentally discovered a side benefit from ceramic coating the dump and 3'of exhaust on a turbo diesel, they picked up 5 or so HP on a Nissan TD42T with a 3" dump and exhaust.

They backed to back this to confirm.

Seems like the increased velocity downstream of the turbine helped evacuate the gasses a little better, just as it's claimed in a naturally aspirated engine primary header tube.