4-2-1 and exhaust wrap?

Rich H · Post by **Rich H** » Fri Aug 18, 2006 12:53 am

My 4-2-1 should be here in a week or so, Janspeed small bore with flexi. What is the consensus on heat wrap? Have heard it's pointless as it can damage the exhaust with overheating and warping, but it's Stainless so I can't really see that being a big problem.

ninja · Post by **ninja** » Fri Aug 18, 2006 12:28 pm

would have to be very hot indeed to warp stainless steel

ninja

Post by **Shug** » Fri Aug 18, 2006 12:29 pm

RICHARDHUMBLE wrote:My 4-2-1 should be here in a week or so, Janspeed small bore with flexi. What is the consensus on heat wrap? Have heard it's pointless as it can damage the exhaust with overheating and warping, but it's Stainless so I can't really see that being a big problem.

I would. Might make it brittle, but by the time it's done that, you'll be swapping it for a big bore solid number anyway (to go with the 200bhp grenade you'll have turned it into by then

)

Plus - speeds up cylinder scavenge and protects alternator. Spray it with the sealing heat resistant paint afterwards, or it'll get oily & turn into a fire hazard.

Sanjøy · Post by **Sanjøy** » Fri Aug 18, 2006 12:49 pm

I posted on SE1 at Xmas about this. Bottom line was no and if you must get it ceramic coated but it shifts the heat elsewhere.

Glowing Zonda tail pipes anyone ?

Post by **Shug** » Fri Aug 18, 2006 1:08 pm

Sanjoy wrote:I posted on SE1 at Xmas about this. Bottom line was no and if you must get it ceramic coated but it shifts the heat elsewhere.

Glowing Zonda tail pipes anyone ?

Can't say it hurt Gordon's car... You can't compare a facking 7 litre V12 to the K series! If you heat wrap it and paint it, the fire hazard is zero (which I'm sure was the problem with the heat wrap vs. coating from memory)

I'm not too bothered about theoretical physics - the empirically tested opinion is that it works....

Baggy · Post by **Baggy** » Fri Aug 18, 2006 1:40 pm

There was something a while ago on SELOC about the fact that in the elise they get wet which can accelerate corrosion (even on stainless systems)
I seem to remember something about every time you use the car the steam/drying wrap doesn't smell very good.

maybe the sealant paint shug mentioned would cure that too though.

Uldis · Post by **Uldis** » Fri Aug 18, 2006 2:18 pm

I've been using wrapping for some time now and can say there is no problem.
And I had at one time a leaking oil hose, and it leaked onto the pipe (as soon as it got hot the oil turned into fumes and evaporated).
Could think probably if there was a sudden release of oil onto the exhaust, like a BROKEN hose, then it would be different, but for most of it, people are being paranoid.

I was concerned with wrapping which is why first I went to ceramic coating with shielding.
The pipes were running red hot (which is normal from what I hear for ceramic coated) and soon a crack developed.
They were still emmitting loads of heat, so I put in a heat shield and got rid of it soon thereafter because of the rattling.

But needed to control the heat, because was cooking the wires around the alternator and melted the boots of the shift linkage when running without protection.
So then tried several different brands of wrapping, they all came apart, disintegrated quite soon.

Then I found the one at nfauto (http://www.nfauto.co.uk/exhaust_wrap.htm) which is pretty good and doesn't come apart, because it has stainless threads interwoven.

It's so good that Jim started using it as well on his 2bular exhausts.

Bottom line (in my case): it works, and I will continue doing it.

Sanjøy · Post by **Sanjøy** » Fri Aug 18, 2006 2:57 pm

Worth mentioning Uldis has a S1 Exige and water falling on the wrap is not an issue.

SP (way out of his depth)

Post by **Shug** » Fri Aug 18, 2006 3:05 pm

Sanjoy wrote:Worth mentioning Uldis has a S1 Exige and water falling on the wrap is not an issue.

SP (way out of his depth)

As baggy alluded to - the coating spray (it's a silver high-temp spray) seals it - so water, oil or whatever else can't permeate it.

Stu160 · Post by **Stu160** » Fri Aug 18, 2006 6:44 pm

I wrapped mine when I changed the engine,expecting it to stink every time I started the engine,but I have to say,its been fine,not to much smell at all.

No other probs so far as well.

Stu

Rich H · Post by **Rich H** » Fri Aug 18, 2006 8:14 pm

Looks like it will be here by monday and heat wrap seems

Will investigate...

Rich H · Post by **Rich H** » Mon Aug 21, 2006 10:12 pm

It's here, heat wrap should arrive tomorrow and I'll get some high temp paint and give it a good going over.

Rich H · Post by **Rich H** » Mon Aug 21, 2006 11:18 pm

Why bother with a stainless exhaust if the flexi is zinc plated mild steel

Is it worth painting the zorst first then wrap and repaint?

I have ordered 50' of 2" wide stuff, worth doing the rest of the system (De-Cat and larini) while I'm in there?

woody · Post by **woody** » Tue Aug 22, 2006 4:50 pm

Richard, can't you get it painted at work? Hight temp anti-heat type paint for compressor cases.

Rich H · Post by **Rich H** » Tue Aug 22, 2006 5:09 pm

Nah, we don't paint them, they are all titanium anyway. Going to wrap it now and paint it later. CBA to go get paint before dinner...

Scottish Elises

4-2-1 and exhaust wrap?

4-2-1 and exhaust wrap?

Re: 4-2-1 and exhaust wrap?