RichN
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| posted on 21/5/11 at 05:26 PM |
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Should I Wrap my Exhaust Manifold?
Question:
Should I wrap the exhaust manifold on my RIOT? The engine is rear mounted and I have the Sylva Stainless Exhaust.
Basically the fibreglass engine cover gets really hot above the manifold and I thought about wrapping the bits under the cover to reduce the
temperature.
I have researched the 'net where some say it's ok to do and others say it's dangerous?
Does anyone have any experience of using it?
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Ben_Copeland
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| posted on 21/5/11 at 05:34 PM |
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Out of interest why do they say its dangerous?
Ben
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RichN
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| posted on 21/5/11 at 05:38 PM |
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Apparently if it has gaps in then there is extreme heat release which causes a fire.
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Davey D
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| posted on 21/5/11 at 05:41 PM |
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Just wrap it.. it will be fine
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david_hornet27
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| posted on 21/5/11 at 06:34 PM |
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Mines wrapped, more for cosmetic reasons than anything else, and I haven't had any problems. Just make sure it is good quality thick stuff.
IMO black is the best colour to buy as you don't end up with scorch marks...
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big_wasa
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| posted on 21/5/11 at 07:11 PM |
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You will find the can gets hotter than before.
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David Jenkins
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| posted on 21/5/11 at 07:24 PM |
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Yes - the pipe gets much hotter further down the line. Not really a problem unless you're worried about people touching the lower extremities
of the exhaust system.
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RichN
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| posted on 22/5/11 at 11:03 AM |
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Thanks for your replies.
I'll get some wrap (probably in black) and watch out for the hot can.
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Furyous
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| posted on 25/6/11 at 05:19 AM |
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I've heard it's a bad idea in a Fury (not really relevant for you  ) because it moves the heat out of the engine bay and into the
enclosed side pod, where the increased temperatures can melt and set fire to the fibreglass.
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907
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| posted on 25/6/11 at 06:35 AM |
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IMHO
Stainless steel is weak when hot.
Subjecting the manifold to increased temperatures increases the likelihood of contraction cracks
as it cools. (Depending on design, bracing, or lack of, and grade of material.)
Just my 2p.
Paul G
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rusty nuts
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| posted on 25/6/11 at 08:02 AM |
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quote:
Originally posted by 907
Stainless steel is weak when hot.
Subjecting the manifold to increased temperatures increases the likelihood of contraction cracks
as it cools. (Depending on design, bracing, or lack of, and grade of material.)
Just my 2p.
Paul G
If mine cracks I will take it back to the supplier! Mel
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Strontium Dog
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| posted on 25/6/11 at 09:59 AM |
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It's a good thing to do, it reduces under bonnet temps and increases exhaust gas speeds. If your air intake is in the bay then the colder intake
temps will aid power and the increased gas speed will help cylinder scavenging and thus you may make better power if correctly fueled! 
http://s187.photobucket.com/albums/x319/zephyr2000/General%20forum%20uploads/?action=view¤t=3DEngine.mp4
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eddie99
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| posted on 25/6/11 at 10:51 AM |
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The only way its dangerous is if you have an oil issue in the engine bay, then the wrapping soaks it up nicely. If you have any igniting then it acts
like a wick!
You don't want to know why i know......
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Johneturbo
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| posted on 25/6/11 at 11:01 AM |
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I spoke to Simpson race exhausts about this and they said it was a bad idea to wrap exhaust as the heat can't escape and can sap power
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michael92
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| posted on 5/9/11 at 02:57 PM |
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quote:
Originally posted by Johneturbo
I spoke to Simpson race exhausts about this and they said it was a bad idea to wrap exhaust as the heat can't escape and can sap power
the heat cant escape? i always thought from the physics side of things a hot gas is a quick gas and the hotter the gas temp the quicker it'll
flow hence wrapping your manifolds and downpipes.
thats just my view on it anyway 
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steve m
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| posted on 5/9/11 at 04:27 PM |
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Here's my view from a post i put on this site a short while ago
Will i use exhaust wrap again?? NO
Exhaust leek
I was going to post a question about why my car always pops and bangs on the over run, but ive found out why!
I had noticed a small burn to the exhaust wrap, so it was obviousley a small hole in the manifold
So today i whipped the manifold off for a quick and easy repair, BUT NOT!
under the wrap, was a crack about 80% all the way round the manifold, and the stongest thing holding it all together was the exhaust wrap and wire and
20% of fatiged metal
Well, that was a lucky find, as i doubt it would of lasted much longer, and this would of resulted in my lower downpipe coming out of the side of the
car, hitting the ground, and removing the whole downpipe, exhaust and silencer off the car
This would also proberly of taken out my nearside alui side panel, and rear wheelarch !!
I am soooo glad i did this job today (between nightshifts!) as i really wasnt going to bother untill the burn mark got worse
Steve
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pewe
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| posted on 5/9/11 at 05:18 PM |
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Even after wrapping mine the heat coming up to the bonnet was still higher than I would like partic. as the clutch cable runs over the ex.
manifold.
I bought some fire-board (used for soffits) from the local builder's merchant, cut it to shape and used two big tool clips to mount it to the
outer exhaust headers.
Seems to disperse the heat quite well though it needs replacing every year or so. Improved it's longevity by putting packing pieces of soffit
between the board and clips.
Can send pics if you need them.
HTH.
Cheers, Pewe 
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albero
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| posted on 2/1/12 at 09:29 AM |
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I've used heat wrap and it eventually just dries and cracks up - I had my manifold ceramic coated by Camcoat not too expensive , reduced the
heat and looks good
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iank
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| posted on 2/1/12 at 09:50 AM |
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Not sure if it's worth the bother on a riot personally as the exhaust is out of the back before you know it,
What do other riot owners do/recommend?
[Edited on 2/1/12 by iank]
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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MattStorey
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| posted on 12/1/12 at 08:50 AM |
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Heat shielding on the bonnet to prevent warping?
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matt_gsxr
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| posted on 12/1/12 at 09:27 AM |
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On mine I have a aluminium heat shield on the headers (and turbo) and have bonded some heat reflective mat onto the underside of the
'bonnet'. Without the mat the bonnet surface got to 98degC even after 'gentle' run.
this stuff is well priced and works http://www.nfauto.co.uk/heatmat.htm to my mind it looks good too.
Worth doing the heat mat whether you wrap of not.
Matt
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