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Message started by scotland66 on 06/04/13 at 01:41:52

Title: exhaust wrap
Post by scotland66 on 06/04/13 at 01:41:52

Hi all, could someone explain to a newbie, why I see so many savages with an exhaust wrap? What are the benefits?
Many thanks

Title: Re: exhaust wrap
Post by Jolly Executioner on 06/04/13 at 02:22:25

It looks good.

Title: Re: exhaust wrap
Post by mpescatori on 06/04/13 at 03:08:47

I have ridden modern bikes, as well ans "golden oldies", and currently own and drive a modern classic, a 1980 MGB.

There are many advocates to exhaust wrap, and many more against.

Those FOR exhaust wrap claim the benefit of keeping the heat of the exhaust gasses IN the manifold, and therefore claim the engine bay is relatively cooler. In cars... no point in motorcycles...

http://a.cdnbrm.com/images/products/rell/exhaust_systems/heatshield_products_exhaust_wrap_3.jpg http://www.mgexp.com/phile/1/176171/_DSC0438.jpg
Example of exhaust wrap in a classic ... In real life, this is a true photo of an exhaust manifold that cracked where the wrapping ended... :-X

Those AGAINST exhaust wrap underline the point that the exhaust manifold is engineered not only to convey the exhaust gasses out, but also to dissipate heat there where it is hottest, the head and the exhaust ports...
...trapping the heat IN, therefore often resulted in warped heads and overheated valve trains... ::)

It is not a mistery that in many "hotter" bikes of the '50s-'70s, the exhaust pipe was attached to the engine head with "finned clamps".

http://thumbs3.ebaystatic.com/d/l225/m/mRYLS303ObCu1Zx5sbQdKfQ.jpghttp://thumbs1.ebaystatic.com/d/l225/m/mo2Vw_sLIqmcnIvNs9k4uwg.jpg

Therefore, exhaust wrap is the "would be tuner's cosmetic snake oil", it makes the bike supposedly meaner, but by no means any faster...

...and... it's a pig to remove, should you ever change your mind...

AND... come to think of it... the Savage already has a twin-layer exhaust pipe, so that what you see on the outside is merely the cosmetic sheath to the real (narrower) exhaust pipe on the inside !
;)

Title: Re: exhaust wrap
Post by scotland66 on 06/04/13 at 03:49:22

Many many thanks for the detailed reply!
Ive learned something new again!

Title: Re: exhaust wrap
Post by groupus on 06/04/13 at 07:41:16

I think you will find very few people here arguing that they wrapped their pipe for any scientific reason. The fact is, the Savage pipe gets really hot close to your leg and does not have the type of heat shielding that a lot of other bikes have. I still have the scar on my calf were i learned that lesson. These bikes are hell for melting boot laces, shoe rubber, and nylon/polyester pants.
For me, it looks classic and hides the dents, rust, bluing, and melted rubber that my header has accumulated. I think that is the same reason most other people do it too. BTW, because fiberglass cloth will hold water, I thoroughly rust proofed and painted the header with VERY high temp paint to keep it from rusting before I wrapped it.

I can't complain about the results
http://distilleryimage10.s3.amazonaws.com/754b3bbaaf7911e2980e22000ae90a1f_7.jpg

Title: Re: exhaust wrap
Post by keith217 on 06/04/13 at 08:50:27

Thats a good enough reply for me. I definitely agree that the wrap is purely for cosmetic and convenince reasons. It's not something thta you see a lot on other bikes, so I guess you can say its an exclusive thing to ours.

Title: Re: exhaust wrap
Post by Dave on 06/04/13 at 09:01:49

29272B362A707375420 wrote:

I think it is popular with the Rat Bike look.....on any kind of bike.

Title: Re: exhaust wrap
Post by pgambr on 06/04/13 at 15:25:05

It took one real good burn and I learned my lesson. The wrap is good stuff; although, it is not really cheap. $50 or so. It isn't as durable as I would have hoped. As opposed to wrapping my pipe a second time I put the money towards 12" boots instead. Best regards.

Title: Re: exhaust wrap
Post by paulmarshall on 06/04/13 at 15:35:13

I wrapped mine but took it off a month later. Started to discolour and was worried about rusting underneath.

Title: Re: exhaust wrap
Post by Gyrobob on 06/04/13 at 19:21:56

64756178797566677C757878140 wrote:

I wrapped mine but took it off a month later. Started to discolour and was worried about rusting underneath.

It DOES rust the pipes underneath sooner than they would have otherwise.

The only advantages I can see to a header sweater:
-- it might make burns from incidental contact less severe
-- it might reduce the noise from the header "ringing" a bit
-- theoretically, it could cause the exhaust system to be a tiny bit less restrictive because:
--- the temp of the exhaust gas stays higher
--- higher temp exhaust is less dense, and, therefore, less viscous, so it should flow easier.

All of those things together don't come close to overcoming the goofy "rat bike" look. Sorry, it is just a personal preference about the looks. Some guys think header sweaters look great. More power to 'em!