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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> exhaust wrap questions /cgi-bin/YaBB.pl?num=1207269557 Message started by Robertomoe on 04/03/08 at 17:39:16 |
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Title: exhaust wrap questions Post by Robertomoe on 04/03/08 at 17:39:16 I found that with exhaust wrap on, the bike is lean again. Is this explained by the wrap? Also, I noticed it getting pretty hot down there. Normal? |
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Title: Re: exhaust wrap questions Post by thumperclone on 04/04/08 at 07:13:29 if i understand the theory the wrap keeps the heat in the pipe to help expell the gasses at a higher velocity..could cause too lean?? |
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Title: Re: exhaust wrap questions Post by vroom1776 on 04/04/08 at 07:17:37 . |
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Title: Re: exhaust wrap questions Post by verslagen1 on 04/04/08 at 08:10:39 706C716974617667686B6A61040 wrote:
The gas is hotter to the exit, it doesn't condense as much. I would think that this would cause more backpressure. |
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Title: Re: exhaust wrap questions Post by Savage_Rob on 04/04/08 at 09:33:31 My bet is that, in the process of wrapping the exhaust, something got loosened up and you have a leak. You'll get some good shotgun blasts and popping from an exhaust leak. |
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Title: Re: exhaust wrap questions Post by Reelthing on 04/04/08 at 10:25:07 283B2C2D323F393B306F5E0 wrote:
The gas is hotter to the exit, it doesn't condense as much. I would think that this would cause more backpressure.[/quote] spose to reduce the back pressure - keep the exit gas hotter so it is less dense for the gas further up the pipe to have to push against - in actually use on underhood header pipes it does help but for the most part by lower the underhood temp a great deal - on our engines sure seems it would only be a very minor difference - double wall pipe and all I'd bet on a leak also - the crush seal at the head/headpipe doesn't hold up too well to several R/Rs |
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Title: Re: exhaust wrap questions Post by LANCER on 04/04/08 at 19:57:40 The most common listed benefit of the wrap is that the hotter exhaust gas (more heat held inside pipe) will exit at a higher velocity, enabling more fuel/air mix to enter the cylinder more quickly, and thereby producing more power in a given amount of time. That is the claim made by the makers of the wrap. |
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Title: Re: exhaust wrap questions Post by thumperclone on 04/04/08 at 20:29:09 7D707F7274632326110 wrote:
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Title: Re: exhaust wrap questions Post by joebothehobo on 04/05/08 at 01:43:59 With the wrap on, the exhaust backfires MORE on decell and LESS on shutdown. I would assume that the fact that the wrap making you run leaner by being a more free-flowing exhaust explains the first part. The second part would probably be explained by the fact that the wrap is physically covering the header-exhaust joint, which was never properly secured and surely leaky, reducing back pressure at shutdown. So, to totally eliminate the shutdown backfire, which is significantly improved, I'd say fix the exhaust-header joint (though the little woof it makes now is certainly livable). To fix the backfire while riding, move up a jet. |
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Title: Re: exhaust wrap questions Post by jk on 04/05/08 at 02:04:35 I just think it looks cool. And we all know 'cool' outweighs any pro or con. ;) |
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Title: Re: exhaust wrap questions Post by rigidchop on 04/05/08 at 05:10:08 i had it on my chopper and it did look cool for awhile, but its been over done to death. kinda like flat black paint. |
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Title: Re: exhaust wrap questions Post by Savage_Rob on 04/07/08 at 12:51:39 6B707E707D7A717669190 wrote:
I went with black ceramic. The flat black look may be overdone but I like it. The ceramic really cuts down on the radiant heat from the pipe too. |
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Title: Re: exhaust wrap questions Post by barry68v10 on 04/07/08 at 16:46:50 Yes, hotter exhaust gas flows faster. The faster a gas flows for a given mass, the lower the pressure... Now, how much the wrap increases heat is hard to say, but I noticed the same thing, bike seemed to run more lean when I put exhaust wrap on with no other changes. |
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Title: Re: exhaust wrap questions Post by barry68v10 on 04/07/08 at 16:47:35 BTW, my pipe started turning blue and gold after I put the exhaust wrap on... |
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Title: Re: exhaust wrap questions Post by Robertomoe on 04/07/08 at 18:08:39 I definitely have less "kaboom" when I turn the bike off, so the wrap helps prevent air from being sucked in, but its also leaner. I used to have the idle screw about 2.5 turns out and it was a little rich, now its pushing 3 and popping occasionally on downshift |
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Title: Re: exhaust wrap questions Post by Onederer on 04/07/08 at 19:04:03 Something to consider before useing exhaust wrap is the moisture barrier it creates between it and the pipe. On cool down moisture will accumilate between it and the pipe, and eventually will cause the pipe to rust out. Its should'nt cause an exhaust because of the double wall pipe, but would on single wall pipes. |
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Title: Re: exhaust wrap questions Post by PatrickMurray on 07/16/08 at 03:48:25 4C7E697E787A404D707D1F0 wrote:
I went with black ceramic. The flat black look may be overdone but I like it. The ceramic really cuts down on the radiant heat from the pipe too.[/quote] did you get yours done by zircotec? i did and was really impressed. if you did you could have chosen another colour if you didnt like black. |
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Title: Re: exhaust wrap questions Post by Charon on 07/16/08 at 05:36:46 I can see where the exhaust wrap would make the outer pipe turn blue. That double wall is designed to allow the outer pipe to be cooler, by allowing the outside air to cool it. The wrap would defeat the purpose of the double wall. The double wall is, itself, a wrap. |
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Title: Re: exhaust wrap questions Post by northshore_paul on 07/16/08 at 08:30:18 What do you use for the wrap and where do you find it. Can you use it in spots...sort of a heat shield instead of the metal heat shield? |
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