just spay it black

 

Painting it black won't work. It gets too hot.

I personally don't think heat wrapping is a good idea. The heat has to go somewhere.....

The cylinder head will get hotter.

 

Painting it black won't work. It gets too hot.

I personally don't think heat wrapping is a good idea. The heat has to go somewhere.....

The cylinder head will get hotter.

that is very correct,it wll probably go the other way,and the cat etc will get hotter,the heat has to escape somewhere.

 

Does it get hotter than this paint can withstand? Its designed for manifolds!

http://www.ebay.co.uk/itm/VHT-High-...76895?pt=UK_Car_Accessories_Car_Care_Cleaning&hash=item33738a51ff#ht_670wt_1270

 

thats what i ment vht black is fine and will tidy it up, it wont get too hot for it

 

Think you'll be disappointed with any sort of VHT paint - tends to go grey where the flame front hits the first bend of the manifold.

I wrapped a 4-2-1 on the old Hyundai Coupe, lasted over 20K miles with no cracking and is still in use (and still wrapped) on another chaps Coupe some 3 years later.

Did help to keep the underbonnet temps down, and saved the skin on the back of my hand a few times too. Tis said it can give gains too, as the heat is retained within the exhaust gasses and hot gas flows better - you'd be hard-pressed to notice any difference though. It won't hurt the cat either, they are designed to work at high temps.

Cracking of manifolds after wrapping is generally a risk where they are made of cast iron, drawn steel tubular jobbies are ok. Even if it does split it's not the end of the world, any competant welder should be able to grind out the crack and weld it closed. Good as new then.

 

A friend of mine spent about 4 hours of his life wrapping a 1.8k manifold and made an amazing induction kit.

At a rolling road session He was running at about 120 ish bhp, guy suggested he removed wrapping and induction job and go back to be stock..

Result 143bhp.


I am unsure of figure before but he was very surprised at the difference.

I'll check later.

 

I would like to know how a stock 1.8 K series was running 143bhp unless it was cammed!? Sounds like dodgy rollers to me..

 

Probably the induction kit that killed the performance - wrapping a manifold will hurt nothing power wise.

 

Wrapping manifolds, does gain.. But not much.. It does keep the temps down in the engine bay and it does help the exhaust gases flow better.. Its mainly just for looks though IMO.. Just so you can say "iv got a heat wrapped manifold blud" :slap: :lol:

 

NOOOOOOOOOOOOOOOOOOOOOOO, dont do it!!! :bigeyes:

Like people say, you would think the heat has to go somewere and wouldn't want a cracked head...

 

I find it extremely doubtful that it would cause a cracked head. The heat does indeed go somewhere, it stays in the exhaust gas and exits the manifold at near supersonic speed.

The heatsink effect of the manifold to the cylinder head is negligable. Were it that hot there, it would not be possible to fit plastic inlet manifolds.

 

Hmmm interesting, I think I will just try painting it with VHT paint then, it has to look better than rust! Its a pity Janspeed don't sell chromed manifolds

I think I will give the heat wrap a miss then, if there is even a slightest chance it will increase the risk of head failure I won't do it. I'm going to baby this car its engine has only done 14k so I want to give it the best life possible!

 

I didn't know they did phenolic spacers for the exhaust manifold too, have you a link for that - might be worth a purchase... EDIT - found this site, but they don't list Rover k-series specifically...

Hmmm interesting, I think I will just try painting it with VHT paint then, it has to look better than rust! Its a pity Janspeed don't sell chromed manifolds

It'll discolour a bit around the first bend, as I say - the rest of the pipeworks will look OK for longer.

TBH, most manifolds (even stainless or chromed steel) seem to be made with a higher percentage of carbon steel in the mix (I suspect for durability reasons) but the downside is that it is still prone to rust problems - even if chromed it'll pop off after a year or two. You could get it rechromed if you like, takes a week or two though.

 

My manifold has been wrapped for over 5 years now, Ferriday thermal gasket between it and the head and absolutely no problems. Engine bay is cooler.

 

I wrapped the s/s manifold on my Scimitar GTC to reduce under-bonnet temperatures. It works. Cooling fan comes on less. The heat goes down the exhaust - not back into the head which would negate any benefit of wrapping the pipes. I used a nice black wrap from Textile Technologies in Manchester.