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Old 04-26-2013, 02:47 AM   #1
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exhaust pipe wrap

Im looking for some colored wrap. Anyone have any scrap pieces in blue, red or green? Pieces as short as two foot would do. Since i dont need a whole lot i really dont want to buy entire rolls. Thanks.
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Old 04-26-2013, 03:09 AM   #2
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heard those colors on the pipes usually start washingg out... red turns into orange example
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Old 04-26-2013, 05:25 AM   #3
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Yea, I heard that too. But I want to try some. My bike is green and black with blue and red stripes on it....so I'm just trying to dress it up a bit.
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Old 04-26-2013, 05:32 AM   #4
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It will play with your fuel mix.

that heat has to go somewhere and it usually goes right back to the head. You may experience backfires with flames, or bike just running like .

I used to have to lean the bikes out a bit after wrapping them, but they were thumpers, so whatever you are on may/may not have any issues.
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Old 04-26-2013, 01:47 PM   #5
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Quote:
Originally Posted by Truckin_Thumper View Post
It will play with your fuel mix.

that heat has to go somewhere and it usually goes right back to the head. You may experience backfires with flames, or bike just running like .

I used to have to lean the bikes out a bit after wrapping them, but they were thumpers, so whatever you are on may/may not have any issues.
this is incredibly flawed logic.
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Old 04-26-2013, 02:34 PM   #6
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Quote:
Originally Posted by TheHoneyBadger View Post
this is incredibly flawed logic.
Point out the error in his logic then, teach somebody something.


What are you trying to wrap with a 2' section of wrap, a 6" section of pipe?
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Old 04-26-2013, 03:13 PM   #7
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I already have titanium colored wrap on there. A couple pieces of red, blue, green or even black interwoven....just to give it a more "custom" look.
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Old 04-26-2013, 03:14 PM   #8
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Quote:
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this is incredibly flawed logic.
I know you dont give a .....,
but tell me how the many pipes I have wrapped always run too rich afterwards.
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Old 04-26-2013, 03:17 PM   #9
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They really shouldn't be running richer.
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Old 04-26-2013, 03:39 PM   #10
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They really shouldn't be running richer.
its completely backwards from what you would think.

I am not a scientist, but I am sure it has to do with the flashpoint of unburned petrol. I always tune a carb to run a tad bit rich, helps cool the top end a bit, really noticeable in air cooled engines. Run it lean they run hot.

Now, if it is running rich, means more unburned fuel...kind of like too much sugar in a glass of tea, oversaturated. So when it hits the rush of oxygen at the end of the pipe.....BANG! It ignites, sends back pressure. Its all chemistry and physics at this point. I am sure you can agree too much back pressure and the bike runs like .

It does not ALWAYS do this. Sometimes it does what you think.....but my experience has shown me that to be the exception rather the norm. AND, I come from mostly working on aircooled thumpers.

I am no exhaust engineer, but I do know that 99% of Mfgs. run them lean for EPA reasons. This also is why most of you either go in the ECM, open the airbox, fatten the jets. Right? Guess what else, most just do a slip on.

Add headers and guess what.....more heat, now you need wrap.
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Old 04-26-2013, 03:43 PM   #11
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Old 04-26-2013, 04:35 PM   #12
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What's a Thumper?
thumper cute squirrel bunny


Cruel SOB...
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Old 04-26-2013, 04:53 PM   #13
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No.. THIS is a Thumper !
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Old 04-26-2013, 05:33 PM   #14
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Quote:
Originally Posted by Truckin_Thumper View Post
its completely backwards from what you would think.

I am not a scientist, but I am sure it has to do with the flashpoint of unburned petrol. I always tune a carb to run a tad bit rich, helps cool the top end a bit, really noticeable in air cooled engines. Run it lean they run hot.

Now, if it is running rich, means more unburned fuel...kind of like too much sugar in a glass of tea, oversaturated. So when it hits the rush of oxygen at the end of the pipe.....BANG! It ignites, sends back pressure. Its all chemistry and physics at this point. I am sure you can agree too much back pressure and the bike runs like .

It does not ALWAYS do this. Sometimes it does what you think.....but my experience has shown me that to be the exception rather the norm. AND, I come from mostly working on aircooled thumpers.

I am no exhaust engineer, but I do know that 99% of Mfgs. run them lean for EPA reasons. This also is why most of you either go in the ECM, open the airbox, fatten the jets. Right? Guess what else, most just do a slip on.

Add headers and guess what.....more heat, now you need wrap.
the guy I sold my Harley explained something similar. We were discussing baffles in pipes and how many think removing the baffle increases the power. He was talking about the characteristics of unbearnt fuel being sent back into the head due to back pressure. This reminds me that I wanted to do some digging myself to see if he was telling the truth or blowing smoke up my .
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Old 04-26-2013, 06:06 PM   #15
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Thumper besides the wabbit, is a single cylinder engine...


Now,

Quote:
Originally Posted by dbuck View Post
the guy I sold my Harley explained something similar. We were discussing baffles in pipes and how many think removing the baffle increases the power. He was talking about the characteristics of unbearnt fuel being sent back into the head due to back pressure. This reminds me that I wanted to do some digging myself to see if he was telling the truth or blowing smoke up my .
Not really sent back in like you would think....more like a blockage with a back up. Make sense?

You can change the diameter of the pipe, sometimes wall thickness (I'll ask my buddy up at D&D on this),bend, length etc. They all have a play.

If you look at most exhaust, it comes off the front and down the sides, gets a temp. decrease, this also plays in. The (unburned) fuel *can* get cooled enough to just get sent out the pipe. This is also bad....for your wallet. Wasteful.

If you take a stock exhaust system and alter it (remove the baffles) you have done the opposite of what the intent was. We would be at less air in, more air out, with no fuel adjustments....guess the results.....less "power".

If you let more air in, you adjust for more air out, AND more fuel in. ALL THREE at the same time, you then fine tune the fuel/air mix and factor in the exhaust.

Toss in a wrap and guess what, we are right back to where we started .


Wrap has its place....I guess. I would not want a bike with it, not after learning what I have learned over the last 20 years. I would just redo the piping and the rest of the . UNLESS we are talking drag bike, or some thing similar.

Are the MotoGP bikes wrapped? I may be wrong, but I cant remember seeing it.
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Old 04-26-2013, 06:23 PM   #16
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ive been running with wrapped pipes for about 2 weeks now with no noticeable difference. it was initially straight pipe, which killed my low end torque due to no backpressure, but I've since added lollipops that essentially covers up 80% 4-5inches up the tip. That in itself solved my lowend

bike came stock lean @ 14.7, modded sensors so the ECU puts out 13.8, balanced that out with the higher flow air filter.
484327 10151752756779505 1641967747 n

The only plausible downside ive heard of wrapping was the possibility of deteriorating the pipes themselves.

Last edited by dylan; 04-26-2013 at 06:26 PM.
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