Finally!!!!
Road Master
Joined: Feb 2006
Posts: 1,072
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From: I been around
RE: Finally!!!!
ORIGINAL: killer.com
What are ya worried about phreak??
What are ya worried about phreak??
That pipe wrap is supposed to improve exhaust gas scavenging by retaining the heat in the pipes. With some areas of the pipe not phully wrapped, I would worry that it could lead to problems such as metal break down in the pipe.
I've seen other 2 into 1 pipes that weren't wrapped even that started crumbling at the welds.
Don't get me wrong, I like the look of the wrap on pipes, it's just I believe it's something that has to be done very throughly and correctly to have a benefit. Done wrong, I believe it can be bad phor the pipes.
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Cruiser
Joined: May 2006
Posts: 132
Likes: 2
RE: Finally!!!!
phreak- I did read some of the posts- pros and cons of pipe wrap. Don't get me wrong, but if the pipes get damaged by the wrapping, I'll have to live and learn and get new pipes. Not that my father is Bill Gates or anything, I fiqured I'd wrap them (I like the look) rather than spend a couple hundred dollars on the heat shields. Yes the area by the tranny is were the mounting clamp is and there are no welds there. Eric
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Cruiser
Joined: May 2006
Posts: 132
Likes: 2
RE: Finally!!!!
phreak- I don't mean to beat a dead horse, but I was thinking about the pipe wrap issues and want to voice my thoughts. First off, remember the 60's were good to me. If the pipes are wrapped or not , (don't know the exact number) and the exhaust gases are 1000*. If the pipes are not wrapped that 1000* gas temp still goes down the pipe and heats up and cools down, right? If the pipes are wrapped the same gas temp (1000*) goes down the pipes and still heats up and cools down, just at a different rate. If it is retaining heat will the temp increase or does it stay the same just flow down the pipe differently? So I quess I don't understand how the weld would become brittle or break, the same temp is going down the pipe?? Does this make sense or am I just babbeling. I would think if the weld were junk they would get damaged wrapped or not. 
Road Master
Joined: Feb 2006
Posts: 1,072
Likes: 0
From: I been around
RE: Finally!!!!
well phirst off, if the welds are crap, their crap no doubt about that.
Second, what the wrap does is help prevent the heat phrom disapating until AFTER it leaves the pipe. If you look at an infrared image of a bike while it's running, you will notice the pipes will show as warmer the closer you get to the cylinder, and they will cool towards the tip(s). The wrap helps the heat be retained and the exhaust gases phlow more effectively out of the pipes.
The exhaust gas doesn't get any hotter then when it started with the pipes wrapped. It just stays a more consistent temp on the way out. They don't cool as quickly.
So my big worry with the way you have it done was that the gases... remaining at a consistent temp..... will heat the majority of the pipe until it get's to the unwrapped portion where the metal will be cooler., then once again into a wrapped portion, where the temp would be maintained. Just phor the sake of argument, perhaps some of the exhaust temps will make it through the cooled area and maintain their heat, causing the area closer to the end to be warmer then that middle. That area where it could conceivable be cooler is the one I would be concerned about.
Guy I knew with a Softail, and a wrapped 2 into 1 had his break down at a weld where the 2 headers came together. But he did manage somehow to get a decent wrap on his at that point too. I think he wrapped the phront header and ended at the "Y", then when wrapping the back header continued on with the wrap past the "Y".
I'm not sayin' "Don't Do It!", I'd just be cautious and keep an eye out.
But hell it's all an experiemnt anyway.
Second, what the wrap does is help prevent the heat phrom disapating until AFTER it leaves the pipe. If you look at an infrared image of a bike while it's running, you will notice the pipes will show as warmer the closer you get to the cylinder, and they will cool towards the tip(s). The wrap helps the heat be retained and the exhaust gases phlow more effectively out of the pipes.
The exhaust gas doesn't get any hotter then when it started with the pipes wrapped. It just stays a more consistent temp on the way out. They don't cool as quickly.
So my big worry with the way you have it done was that the gases... remaining at a consistent temp..... will heat the majority of the pipe until it get's to the unwrapped portion where the metal will be cooler., then once again into a wrapped portion, where the temp would be maintained. Just phor the sake of argument, perhaps some of the exhaust temps will make it through the cooled area and maintain their heat, causing the area closer to the end to be warmer then that middle. That area where it could conceivable be cooler is the one I would be concerned about.
Guy I knew with a Softail, and a wrapped 2 into 1 had his break down at a weld where the 2 headers came together. But he did manage somehow to get a decent wrap on his at that point too. I think he wrapped the phront header and ended at the "Y", then when wrapping the back header continued on with the wrap past the "Y".
I'm not sayin' "Don't Do It!", I'd just be cautious and keep an eye out.
But hell it's all an experiemnt anyway.
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