Collective Head Scratch - Exhaust Wrap ?

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Collective Head Scratch - Exhaust Wrap ?

Post by 1969SE5 » Thu Jan 10, 2019 11:34 pm

chaps, looking for some opinions.

I am looking to heat wrap the tubular manifolds down to the collectors, using 25mm wide wrap, now assuming an overlap of 25 to 50% , how many metres should i buy do you think, to do both Manifolds of the Essex ?


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Collective Head Scratch - Exhaust Wrap ?

Post by Motolab » Thu Jan 10, 2019 11:51 pm

I know, it is not the answer for your question, but.... Why on earth do you want to do that?

I do sell a lot of This stuff in my motorcycle shop, and i mean.. Really a lot.... but... Other than looks on motorcycles and use on rally Cars with turbo's, i can not think any reason why you should use it on a Scimitar ...

I can not answer your question as we only sell 50mm wide wrap and have no experience on Cars with This stuff...
(50mm wide x 10m long wide does cover approx 2,5m, 40/45mm diameter as a "rule" )



edit: added diameter
Last edited by Motolab on Fri Jan 11, 2019 8:47 am, edited 2 times in total.


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Collective Head Scratch - Exhaust Wrap ?

Post by Joe. » Fri Jan 11, 2019 2:08 am

I've tried it in the past when I was when I was trying to lower the underbonnet temperatures on my 5a. I bought 20m worth and there were about 3 or 4 metres left once I'd done both sides. Its actually suprisingly hard to fit the wrap with the exhausts on the car...

In the end I'm not sure it made that much difference, possibly ceramic coating may be more effective? Either way I took the wrap back off again 3 month later...

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Collective Head Scratch - Exhaust Wrap ?

Post by Coupe Racing » Fri Jan 11, 2019 5:26 am

It needs reverse wound wire to hold it in position too .
Do it with manifolds off .
2 packs of 50mm should do it


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Collective Head Scratch - Exhaust Wrap ?

Post by manny » Fri Jan 11, 2019 6:43 am

Good day all,

I too have been wondering about wrapping the manifolds on the TR...most participants do feedback with positive results...but i am no clearer as to whether it is needed on a NA engined road car that probably wont be driven that often? so any advice for\against by users would be welcome for me too..

Ta

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Collective Head Scratch - Exhaust Wrap ?

Post by Coupe Racing » Fri Jan 11, 2019 7:01 am

Remember that you will be transferring the heat focal point further down the system.
Plus moisture can be trapped under the wrap


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Collective Head Scratch - Exhaust Wrap ?

Post by roymck » Fri Jan 11, 2019 8:53 am

Don’t do it , took mine off



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Collective Head Scratch - Exhaust Wrap ?

Post by 1969SE5 » Fri Jan 11, 2019 8:56 am

Great replies guy's, I was only thinking off it, as have it on my Rally car, and good for keeping under bonnet temp down, what are the real negatives on fitting to the Scim ? is it the premature death of the headers mainly ?

cheers


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Collective Head Scratch - Exhaust Wrap ?

Post by roymck » Fri Jan 11, 2019 9:18 am

I had stainless headers make unknown and when I unwrapped them they had heavily corroded to the extent there’s was a hole in them . Does the wrapping also hold the damp in them if the car is not used regularly ?



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Collective Head Scratch - Exhaust Wrap ?

Post by demonbluedays » Fri Jan 11, 2019 9:29 am

I have SS tubulars that have been wrapped which I'll be fitting in the next few months, I remember some point in the last decade it was a common sight to see engine bays with wrapped manifolds. And to be honest? Hearing how much fun they are to put on...I'm not sure I'll be taking the wrap off of mine unless I have to.


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Collective Head Scratch - Exhaust Wrap ?

Post by Motolab » Fri Jan 11, 2019 10:36 am

1969SE5 wrote:
Fri Jan 11, 2019 8:56 am
good for keeping under bonnet temp down, what are the real negatives on fitting to the Scim ? is it the premature death of the headers mainly ?
as there is no turbo, it has no use, exhaust heat is normaly no problem with NA engines, and not only your headers suffer more, also your cast iron heads and valves are coolling slightly less


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Triumph speedtwin '49, Sunbeam S7 '48, BSA B33 '54 & M21 '40 , Moto Guzzi LM2 '79, BMW R51/3 '51
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Collective Head Scratch - Exhaust Wrap ?

Post by Rev Light » Fri Jan 11, 2019 10:56 am

I put some on my manifolds when the engine was out. My manifolds were already very second hand with a repair where one had been grounded. I did it for purely aesthetic reasons. Having sail that I have no complaints and am in no hurry to remove it.

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Collective Head Scratch - Exhaust Wrap ?

Post by Roger Pennington » Fri Jan 11, 2019 11:32 am

Well, speaking personally, I've been driving Scimitars since Jan 1983 with unwrapped manifolds, and will continue that way :wink:


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Collective Head Scratch - Exhaust Wrap ?

Post by 1969SE5 » Fri Jan 11, 2019 12:26 pm

think i am starting to agree, not really looking to make myself work that is not going to be beneficial.


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Collective Head Scratch - Exhaust Wrap ?

Post by GavinR » Sun Jan 13, 2019 11:35 pm

Having completely wrapped a mild steel manifold many years ago and had it go rotten due to the moisture being trapped in the wrap, I only wrap to reduce heat in specific areas now and use jubilee clips at both ends.

On the Scimitar, I wrap the collector and the pipe to the front silencer, to reduce the footwell temperatures when I am rallying. I also have ally sheet underneath the floors to try and reflect the heat.
On my Escorts, I wrap a small section of one of the manifold pipes to keep heat away from the clutch cable (which is also wrapped in heat shielding), and also the pipe to the front silencer to dampen the vibrations / resonance and make the car quieter (as suggested by a Noise official on a rally a few years ago, and it makes a difference).


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