Exhaust Wraping

[dean 0]

what is the best way of heat wraping a gti6 manifold

[Rupertfinch 6]

Ideally with gold leaf

[Rom 0]

There all wrapped much the same way.

 

I cut lengths for each pipe, dampen the wrap slightly, start at the head end and work down.

 

Gotta redo my Mi manifold

[DamirGTI 342]

http://www.guy-croft.com/viewtopic.php?f=1...&hilit=wrap

 

....

Damir

[alync406 4]

http://www.guy-croft.com/viewtopic.php?f=1...&hilit=wrap

 

....

Damir

 

Thats interesting Damir. I did'nt realise that wrapping could do that sort of damage.I was going to wrap my manifold,but i don't think i will now

[welshpug 1,661]

Interesting reading, but its stainless steel so it wont rot as mentioned.

[gti-si 0]

I think it's more likely my wiring loom will melt if I don't wrap the manifold, rather than rotting if I do...Interesting read though Damir

[DamirGTI 342]

Well it's not the rust what concerns me here regarding this thermal wrapping .. it's the heat , heat/thermal stress is the most dangerous factor :

C/P

One must also remember that the heat doesn't just flow outwards radially thru the pipe and down the pipe - it gets into the port, the valve and seat - even piston - region and can cause all sorts of dramas: seats cracking, detonation etc etc. General increases in head temperature are going to degrade the inlet charge density too.

 

 

Rgs !

Damir

[Rom 0]

Thats a very interesting read Damir...

 

WTS 30 mtrs graphite wrap !!!!

[gti-si 0]

Well, the reason for wrapping the manifold, is that the speedo cable is a standard 205 item, so is abit on the short side and will be quite close to the manifold (tied it to the bulkhead so theres about 2inches between them) and finally the wiring loom. If I wrap these items in thermal heat wrap, will it be as effective in keeping the heat away from the wires and cable?

 

I can see your point, it figures. The heats got to go somewhere, back up the ports doesn't sound like a very appealing option.

[welshpug 1,661]

use a 405 speedo cable gti-si, longer but same fittings meaning you can position it further from the heatsource

[Rom 0]

I was planning on some refletive Ali type wrap for my speedo cable aswell as wrapping the manifold. I think ill just stick to the cables etc now. I had my Mi manifold wrapped since i built it.

I took the engine etc out to fix a few problems,one being a slight blow from the manifold. At first i thought maybe one of the welds had broke. But all ok, and there not prone to cracking like 8vs afaik. When i put a straight edge on it it wasnt flat

Ive had it skimmed and is all ok ready to go back on.

 

Now im wondering if the wrap had anything to do with it. I checked the head, that was fine. Id imagine its just coincidence, as the heat to buckle the flange would be immense,sure it would have damaged more. And weve had other manifolds skimmed at work that have never been wrapped. So its not an unheard of occurance.

 

But going to leave the wrap off this time just to be safe. If im honest, i didnt do much research at all when i wrapped it. Just thought it would be good to wrap it and lower temps etc. Obviously none of the bad points are as well known as the limited good points

[DamirGTI 342]

Id say if theres a problem/possibility of melting wires , cables , pipes etc. which are too close to the exhaust manifold , better wrap this items then a whole exh. manifold because of that reason ... im sure that theres some sort of heat resistant insulation/wrap for wires/cables/rubber pipework available on the market for this precise purpose ... i remember that there was some aluminum tape for protecting rubber coolant and fuel pipes from heat in similar cases if the pipes where too close to the source of heat - exhaust system ..

 

This wrapping (as Guy said..) make sense if you have long tubular 4-2-1 exh. manifold , and by wrapping it with this thermal tape it gives an effect of "shorter pipework length" , which boosts up a little bit top end .. this could be good (say a quick adjustment!) for race car for particular type of race stage/lap/sprint where you need a little bit more top end power for better race results ... after the race stage you simply unwrap the manifold and bob's your uncle

 

For road car with an OE exhaust manifold , this wrapping is pointless .. at least i think so ..

 

Rgs !

Damir

[brianthemagical 1]

Just like to point out that the whole reason a car moves is due to heat generation and consequent expansion of gasses. It therefore stands to reason that the higher the temp change, the higher the power. And the engine is surounded by water, so unless you've got a serious engine/arduous conditions you'll do little damage, assuming good condition.

[16v205 9]

Im wrapping my gti-6 manifold, if the manifold fails then its no big issue as theyre plentiful and cheap. I can see the theory about higher temps being created causing further damage but ill take my chances as I dont really think this will be an issue on my car.

 

A big issue to me though is definatly the fuel lines which pass close and go very warm and plyable after a few minutes driving, and the wiring loom was getting a little melted. Ive wrapped both the loom and fuel lines and have now wrapped my manifold. If it cracks in a few years time ill buy another one.

 

Rich

[Peetypug 5]

i might just buy another one now as a spare

i'm wrapping mine, i've bought the wrap already. but i may just wrap the bottom half where its nearest to the bulkhead

i'm not overly keen on the idea of replacing it while the engine is in the car though

[gti-si 0]

Im not overly sure it's possible! It's hard enough with the lump out of the car

[Peetypug 5]

Im not overly sure it's possible! It's hard enough with the lump out of the car

 

thats what i was thinking

Edited May 6, 2008 by sorrentopete

[Rom 0]

Oh im torn now

 

Ive got braided fuel lines. And the loom isnt that close on mine, closest it gets is the grommet on bulkhead. I think this will be one of those topics, where people are split on.

 

Theres valid arguements for both sides. I can see the points made for and against. I dont think anything is going to melt on mine, so i dont feel i HAVE to use wrap. I also dont think wrap is going to have any effect on performance whatsoever.

So i think im settign up camp in the 'Not using it' side for now

[brianthemagical 1]

Ceramic coating.

[205toby 0]

Ceramic coating.

Whcih the article says does exactly the same thing; And it stands to reason. Ceramic coating works on an identical principal to wrap: If the heat can't dissipate through the pipe wall in to the atmoshere because of wrap, ceramic coating or any other reason then the results will be identical. It odesn't matter how it is done, the same thing will happen.

[Cameron 16]

Well I for one am not going to be put off by this, everything has pros and cons and to me the big manifold (std 6) acting as a massive radiator to the engine block / head / everything else is more of a problem than the possibility of my manifold cracking in a few years. I wouldn't be put off too much by the horror stories of burnt valve seats etc as plenty of people have had wrapped manifolds without any problems. As it is with everything it's the few that complain that get noticed.

 

As for ceramic coating, aren't these applied to both sides of the tubing? If so, it would stop heat from entering the metal in the first place.