Heat wrap?

[ReQuieM]

Yeah thats what was the temp plan but I can afford to have it off road so thats not a biggy. The price is the big issue. seams i can get one from the US of A for around low 600's so thats not bad. Just money I dont have...

Eldar.O just push your opinion. I dont give a F Any thoughts would be good atm. I'm either gonna heat wrap or leave it with a heat blanket or some othr 'sheild' device for the moment.

[feral4mr2]

after running up and down the beach most of the day in the feroza after i got the turbo running, the dump pipe radiant heat melted the conduit on one of my main wiring harnesses on the firewall.
i went down to the local hardware store and bought some fibreglass wrapp stuff. i have wrapped it around the dump pipe and some around the manifold. it has helped some in keeping the heat off the surrounding bits n peices.

i have seem this silver heat sheild stuff with sticky on the rear side so you can stick it to things. i wouldnt mind getting some of that.

[oldcorollas]

if you buy some of the wrap, cut off a little piece (like 1cm?) and send to me and i'll put in a furnace and tell you what temp it melts

wrap works for short-medium term. the dump may corrode or otherwise fail after time.
ceramic coating is better and longer lasting. the dump will last a lot longer.

for a short term thing... why not (as long as it doesn't melt into the aforementioned sticky mess )

[ed]

what about ceramic coat then heat wrap? thats my plan...

[ed]

and ive got like a 15m roll here stewy - would be happy to send you a postage stamp of it for testing if youve got an interest...

[TA22 GT]

I experimented with various coatings, shields etc.

My exhaust manifold, turbo snail and dump pipe are all cermaic coated by HPC coatings. In my opinion ceramic coating is very good, BUT its not what I was led to beleive and still puts out alot of heat, too much for me.

So I also use an ACL heat shield which is 2 sheets of aluminium with a sheet of ceramic sheet inbetween, this is the best gear I've found for absorbing heat and reducing under bonnet temps.
I'm not a fan of wraps as once oil gets in there you could have a fire etc, plus it seems to break down over time.

My 20 cents worth.

Cheers,
Simon
http://users.chariot.net.au/~stmezz/celica.htm

[feral4mr2]

is there any sort of DIY ceramic coating?

[oldcorollas]

and ive got like a 15m roll here stewy - would be happy to send you a postage stamp of it for testing if youve got an interest...

no worries... even 1x1cm would be enough... all i need is to see the fibres melt or even a few strands from offcuts.. either way.

i regularly take furnace up to either 1000, 1150 or 1250C, but can easily do overnight runs of lower temps or just ramp furnace up slowly (like 4-6hrs to 1200) and see what temp it melts at...

as for DIY coatings, theres a few issues.. in no particular order...

thermal expansion difference between metal and coating. thickness of coating makes a difference.
bonding between metal and coating, and maintaining that over a number of thermal cycles.
applying the coating. PVD? plasma spray, HVOF? (i forget the acronyms.. it's late ) .. sintered powder?
oxidation. no coating is impervious to oxygen. oxygen is transported thru an oxide to the metal surface where the metal WILL oxidise. if the part has high enough aluminium, a slow growing alumina layer will develop and the coating will last longer..

well.. that last bit is what we do

there are so many different things you could try.. like aluminising the outer layer of metal to give it oxidation resistance and then thermal spray an oxide like PSZ (partially stabilised zirconia)... or or...
meh, too many to type since you want a TBC, you might want 50-100 micron thickness layer.

if you google around, you can probably find TBC information for ferrous based products... from things like petrochemical, reactors, crackers.. that sort of thing

anyway.. before i ramble too tmuch...

yeah, send stuff away, is easy for me to test. lemme know what temps they claim, and you want tested to.

edit: and as for wrap over coating... some coating places say that it will make the coating fail. the wrap can soak up petrol and oil and stuff... some wraps recommend soaking in high temp paint to immobilise the fibres (and thereby negating the thermal properties to some extent)... i'm not sure. it will decrease heat in engine bay more.. it will increase the temp of the outer layer of coating (which is in contact with oxidising atmosphere.. as opposed to the inner layer.. which is in contact with either slightly oxidising or slightly reducing atmosphere.. usually reducing)
i like alloy heat shields top protect parts. i like ceramic coating on the parts to reduce heat transferred.... heat wrap will help as well by reducing the temp differential across the exhaust pipe, whilst maintaining a good drop across itself, and thus limit the flux of heat... which is what we are really trying to do.. not reduce temp, but heat flux....

[oldcorollas]

is there any sort of DIY ceramic coating?

oh, and since they can coat the inside of pipes, i don't think it is a thermal spray process.. unlkess they have some fancy gun with a min 90deg head.... but....

would be good for toymods to organise a tour of the HPC factory

[mrshin]

I was there only yesterday... although I didn't get to go have a look inside...

I must say I've always been impressed with their work, and found the coatings to insulate surprisingly well. They suggest that wrapping over the top of the coating = bad idea, and as the stuff seems to hold back heat so well anyway, I probably wouldn't bother. Maybe a heat shield a short distance from the coated pipe?

[skiddz]

i have my celicas extractors wrapped, i didnt do it, but the previous owner did, and he recons he made a bit of a difference but not alot, i dont know any better with this car, so i might have to take it off and see what happens

[Ben Wilson]

If you take it off, you will destroy it, it becomes brittle fairly quickly from the heat.

[kingmick]

If you take it off, you will destroy it, it becomes brittle fairly quickly from the heat.

yes it will! its a one use only type of thing! unless it is still un heated then you can resoak it and start again.

[Joshstix]

oh, and since they can coat the inside of pipes, i don't think it is a thermal spray process.. unlkess they have some fancy gun with a min 90deg head.... but....

would be good for toymods to organise a tour of the HPC factory

I'm pretty sure the coating process is much the same as powder coating. A charged powder of "whatever coating" is sprayed at an oppositely charged "thing to be coated" then the part is baked to finish the coating.

Yeah I know the jargon is a bit high falluting but that's how it worked when I sw it done.

I have seen home ceramic coating kits advertised in the US.

[30psi 4agte]

i have just had my dump and screamer pipes coated in ceramic and im also going to wrap them in heat wrap. The reason for this is that my dump gets very close to the firewall in one spot ( about 15mm).

If anyone is interrested i have struck a deal with DEI products in the US and can get stuff at wholesale prices.

I have just brought over some rolls of their new black heat wrap range.
It looks very neat and wont look grubby after time like the white stuff will! + it is stealthy.

Ill post some pics tomorrow!