Exhaust wrapping

[bobfather]

I've seen a few TVR's, especially Chims & Griffs with wrapping around the exhaust manifolds. What is the benefit of this? I can see that it'll reduce under-bonnet temperatures but I wondered whether there were other benefits to doing this simple mod

[Diablos-666]

Reduce under bonnet temps as you said and will also reduce heat soak.

I think it also reduces the tinny sound at low revs?

I think I also read somewhere that it can reduce the life of the manifold itself, again I could be wrong.

Not much help I suppose

[Alexdaredevilz]

Diablos-666 said:

I think it also reduces the tinny sound at low revs? :

Yup worked for me,

[scotty_d]

It may reduce under bonnet temperatures and heat soak but if the heat does not dissipate where does it go? and the RV8 in effect A 3kw heater just a thought.

[macdeb]

I think keeping the heat within the exhaust gasses aids the speed and exit of them.

[JonyTVR]

can do depending on how well the system work I think macdeb but cant see it causing any major detrmental effect on the system, but then I'm no expert!

I'm pretty sure its advised to only wrap the manifold and stop at the cats as they will end up overheating (unless you have removed them obviously!)

[Alexdaredevilz]

Heres mine, since i decatted it, and wrapped it, its deeper and i can see less heat waves coming from the bonnet vents

[Flintstone]

Be careful. As scotty d asked, where does it go? Downstream and if the pipes are too close to somewhere they shouldn't be or the rubber hangers get too hot you could be in for a shock.

Edited by Flintstone on Sunday 6th March 12:34

[Guillotine]

OK for racers but not really for road cars.
Racers now use Cermacoating (ceramic paints) as they are more permanent and efficient.

Bandages (besides other probs...) retain water.
Not an issue if you have stainless headers, but stock ones will rust out.
Short trip to the shops on a rainy night, park it up for a few weeks...

If the exhausts are red hot they will dry out as steam, but on short runs.
Andy

Regarding heat...it goes further downstream, mid box will be a few degrees hotter, but mainly out the back.

[Guillotine]

BTW the reason for doing it in the first place is heat soak.

Heat going out the back and not retained in the headers means under bonnet temps reduce quicker.
The heat from a stationary V8 cooks the ignition, wiring, starter, fuel etc
= Hot start probs. Very bad in a racer too.

Again, cermacoating massively reduces this. My headers (manifolds) are cool enough to touch from red hot in about 5 mins. Couldn't touch the plenum as too hot. No...Really.

coated headers...

Edited by Guillotine on Sunday 6th March 21:25

[neal1980]

Wrap it...seems to be working for me so far very impressed.

[mad4amanda]

Have a very nasty habit of catching fire though! What happens is you spring an oil leak and then the oil is absorbed into the wrap and up it goes ! Put out 4 fires like this on trackdays already this year last year I lost count but included a noble and a cerb.
For this reason alone I would only use a coating not a wrap.