Thermal Wrap...

[Stefan]

your theory is sound, and as fro as getting old and tatty, you are meant to spray the tape afterwards to seal the fibres in... not good to have any kind of fibres floating around..

What are you supposed to seal it with?

I wrapped my dump pipe recently, got covered in fibres. It frays very easilly when cut to length too.

[oldcorollas]

instructions with mine were to wet before wrapping.. so you don't get a lungful of fibres and then seal the outside with high temp paint.. not soak it thru,, just coat the surface to stop fibres from fraying and flying aorund the place.

better wrap may not need that so much.

[Stefan]

Mine didn't come with instructions. I was slightly concerned about the fibres, should have worn a mask :|

On a lightly related note, my turbo 'beanie'/bag thing got wet with coolant from a leak while doing turbo swap. Hung it on a line for a while but the thermal material didn't completely dry, so put it back on. Is pretty funny driving along with steam coming from the bonnet and people pointing it out to you .

[RObErT_RaTh]

instructions with mine were to wet before wrapping.. so you don't get a lungful of fibres

Apparently it also helps with stretching and pulling the wrap around the pipes. Tightens nicely when it dries too.

[oldcorollas]

i didn't find it shrank when it dried (at least the crap stuff i used) ... it is not like the fibres absorb water like sayy, cotton does. but it did make it a whooole lot less annoying

anyone got any spare of the black wrap stuff? i wouldn't mind sticking it in a furnace to see when it melts
(hmm, and if it can be posted to melbourne this week.. might only need aussie postage )

[Stefan]

I have some ebay black stuff left over, I'm happy to cut off a little and post in an envelope to you in Melb. Should only need standard letter size.. PM me if you like.

This is the stuff - sold as 'black' but really is just grey (you can see how frayed it is where I cut a separate piece to wrap the wastegate pipe:

[forey]

what type of heat sheilding is that around the firewall?

[Stefan]

My homemade attempt at reducing radiated heat to the clutch/brake masters. Jigsawed some aluminum sheet and bent to shape with a vice then covered in heat reflective material (same stuff as the tape you can buy, but I bought some sheets as well). I think it's my actual clutch line above the back of the engine that is the issue now.

[forey]

interesting mate, my clutch fluid get that hot it actually boils it haha
did it make much difference?

edit: where abouts in tas are you?

[Mos]

I would suggest one (or two) thin sheets of mild or stainless steel as a heat shield instead of the aluminium. Heat shield material would probably work better though

[Stefan]

It's self-adhesive thermal barrier - aluminium foil and fibreglass laminate - that I have covered aluminium sheet with.

Why do you suggest steel > aluminum?

[Stefan]

Forey - yes it did make a difference, I bought a turbo bag too to further reduce radiant heat in that area (not reinstalled in these pics), but I still have a clutch heat soak issue after the car has been run up to temperature and sat for a while and then driven again. My next plan is to insulate the clutch line you can see above the back of the engine, and maybe some bonnet vents. Basically the hot air from a 1G in an RA65 can't get out very well.

[oldcorollas]

steel has lower heat transfer properties, and aluminium oxide is an excellent radiator of heat (ie, helps the alloy absorb more heat, and helps to re-radiate out to the things you try to protect)

the tape stuff is ok, but is not a very thick thermal barrier, but will have some effect...
and any physical barrier is better than none! the tape is thin aluminium? so the oxide will help it absorb heat. and you are limited by the temp the adhesive can withstand anyway i guess.
a double layer will reduce heat transfer if air can get in between the layers. or a double layer with say, 5-10mm of insulation between will be even better.

stainless will have slowest thermal transfer, of straight metals, but that ACL(?) heat shield stuff (used in falcoons) is very good stuff! easy to work with, and effective

where is the clutch line being heated from? from the alloy shield? long distance from the turbo? heat coming up from the exhaust on the wrong side of the shield, and getting trapped in there?

[Stefan]

I believe it's the actual hard clutch line that is not behind the sheild that is being heated. My master doesn't get hot anymore...

[RobertoX]

edited.........