Author Topic: How many feet of exhaust wrap?  (Read 8179 times)

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Offline Goofaroo

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How many feet of exhaust wrap?
« on: January 15, 2011, 09:19:43 AM »
I am going to order some exhaust wrap for my Mac 4 into 1. Does anyone know if a 50ft roll will be plenty or should I order 100ft.? 
1972 CB500 four
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1978 BMW R100S
1983 CX500
1986 GL1200 Aspencade
1986 CH150 Elite Deluxe
1984 NH125 Aero
2005 Genuine Stella 2T
2007 KLR650
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Offline Kong

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Re: How many feet of exhaust wrap?
« Reply #1 on: January 15, 2011, 09:34:19 AM »
GooFaroo,

I don't know, but let's do some easy arithmetic to figure out about how much should be required and then toss in a fudge factor.  I'll use real optimistic (or pessimistic) assumptions to aid in the fudge factor.

You'v got 4 pipes that are about an inch and a half in diameter and 24 inches long and then one bigger, about 4" in diameter, round pipe that is another two feet long.

On the pipes, it will take about 4.5" (Pi times the diameter) of wrap to go around once.  Let's say that every turn advances the wrap by 1/2 inch.  So for one pipe its 24 inches of pipe times two (because of the 0.5" advance per wrap) or 48 wraps and each one of them uses 1/3 of a foot of wrap, so its 16 feet per pipe.  There are 4 pipes so that part takes about 65 feet.  If you do the big pipe and if its 4"x24, then its 12 inches of wrap material to make a turn, and once again 48 turns, so that's another 48 feet.  Add it to your 65 and it tells you that about 110 feet should do it with some to spare if you pull it good and tight as you wrap it.

Put in the actual lengths and diameters of the pipe you have in front of you and the same methodology should get your close enough to place an order.

That help?
« Last Edit: January 15, 2011, 09:39:41 AM by Kong »
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Offline Goofaroo

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Re: How many feet of exhaust wrap?
« Reply #2 on: January 15, 2011, 09:54:59 AM »
That does help. It makes my head hurt a little but it answers my question. Given that logical calculation and then taking into account my actual plan, I will order 100ft and some Advil.

Thanks!
1972 CB500 four
1972 CT90
1974 CT90
1978 BMW R100S
1983 CX500
1986 GL1200 Aspencade
1986 CH150 Elite Deluxe
1984 NH125 Aero
2005 Genuine Stella 2T
2007 KLR650
2002 KLR250
1985 XR350R plated
1994 DR350SE
2004 Concours ZG1000
1987 KDX200 C
1992 KDX200 E
2010 BMW F800GS
Always room for one more.

saw750

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Re: How many feet of exhaust wrap?
« Reply #3 on: January 15, 2011, 10:01:43 AM »
..nice answer! math who knew??!! lol

Offline apex_seeking

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Re: How many feet of exhaust wrap?
« Reply #4 on: January 15, 2011, 10:03:14 AM »
I ran out of toes by the time I got half way through the header.  :D

KingCustomCycles.com

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Re: How many feet of exhaust wrap?
« Reply #5 on: January 15, 2011, 11:38:43 AM »
Applying that math, and adjusting for real world experience with wrapping about 10 of them, I will reaffirm the 100 foot order.  You will have some left over, but not much.  Two things with header wrap: 

Soak it in water before installation and
ALWAYS wear latex gloves when handling it. 
Brass or stainless safety wire from aircraft makes a dandy (and inexpensive) clamp

I just put a youtube video up showing a set I just did on a little Yamaha Cafe Racer.  I call it "smoking them in" but you'll get the idea when you see the video.  Under my vids, KingCustomCycles

Offline swellguy

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Re: How many feet of exhaust wrap?
« Reply #6 on: January 15, 2011, 02:07:24 PM »
Soak it in water before installation and
ALWAYS wear latex gloves when handling it. 
Brass or stainless safety wire from aircraft makes a dandy (and inexpensive) clamp

I am not disagreeing with you on any of this but having done a few sets recently, my experiences suggest that:

- soaking is a good idea but if you unroll 50 or 100 feet of the stuff to soak it in a bucket, you'll have a nightmare of a snake trying to wrap your pipes with, say after the third wrap, you have 90+ sitting on the floor to wind around. I've found more manageable to work the roll from the package and use a spray bottle to wet/soak the material as it goes on. It may add a bit of stretch but it's far easier to navigate around corners and bends with a roll in your hand instead of a pile on soaked wrap on the floor.

- do wear gloves, disposable latex ones are good and cheap, mechanics gloves (if you already have a pair) also worked for me.

- safety wire is certainly a cool, old school way of clamping the wrap - you do it at start and finish of the wrap. Wrapping it around several times and hiding the twist away from view makes a cleaner look, so does using two rows or wire looks beter and more effective than one. The stainless zip ties they sell for the wrap also look good but remember most rolls don't come with zip ties in them, they're an extra item to purchase.

- also, add a few inches to the cut end length and fold it over inside itself so you get a nice clean folded edge that won't fray.

- once complete add more spray to soak the wrap even more.

My additional 2ยข worth
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Offline Goofaroo

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Re: How many feet of exhaust wrap?
« Reply #7 on: January 15, 2011, 05:48:26 PM »
Thanks for the tips. I've never done it before so all advice is appreciated.
1972 CB500 four
1972 CT90
1974 CT90
1978 BMW R100S
1983 CX500
1986 GL1200 Aspencade
1986 CH150 Elite Deluxe
1984 NH125 Aero
2005 Genuine Stella 2T
2007 KLR650
2002 KLR250
1985 XR350R plated
1994 DR350SE
2004 Concours ZG1000
1987 KDX200 C
1992 KDX200 E
2010 BMW F800GS
Always room for one more.

Offline slowjo

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Re: How many feet of exhaust wrap?
« Reply #8 on: January 16, 2011, 08:18:12 AM »
What diameter of safety wire should be used?

Offline Kong

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Re: How many feet of exhaust wrap?
« Reply #9 on: January 16, 2011, 08:28:59 AM »
I'd immagine you'd use pretty heavy wire, maybe 0.030 or so.  Go to the local municipal airport and see what you can beg.  Mostly you'll find stuff around 0.020~0.025, but to tell the truth for your purposes it won't make much difference.  Oh, there is a kind of wire called break-off wire that is used to hold tags on and such, its available in copper and bronze (which will oxidize rapidly) and might go well with your bike.

On Edit:  In truth you'll probably find that you just want a flexible small diameter wire that can be easily worked with that doesn't rust.  The best I know of is electric fence wire.  You can buy a quarter mile of it for cheap at any farm supply place.  Mighty handy stuff to have around.
« Last Edit: January 16, 2011, 08:33:15 AM by Kong »
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1986 Honda Rebel, 450
1978 Honda CB550K
1977 Honda CB550K

Offline ev0lve

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Re: How many feet of exhaust wrap?
« Reply #10 on: January 16, 2011, 08:35:13 AM »
I am going to order some exhaust wrap for my Mac 4 into 1. Does anyone know if a 50ft roll will be plenty or should I order 100ft.? 

50 feet was just enough to wrap my Kerker to the collector

Offline Goofaroo

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Re: How many feet of exhaust wrap?
« Reply #11 on: January 16, 2011, 08:59:59 AM »
I'm going to go ahead and order 100 Ft. just because I don't want to run out in the middle of the project. I also figure if I have some left over I might use it on another one of my bikes. I have some stainless aircraft safety wire that I'll be using to tie it off.

I thought I was going to just get online and order some yesterday but then I was confronted with a lot of choices of material, widths, and colors. I'm thinking that the 1" wide wrap would be easier to work around the tight corners than the 2". As for material and color- just another decision to make.
1972 CB500 four
1972 CT90
1974 CT90
1978 BMW R100S
1983 CX500
1986 GL1200 Aspencade
1986 CH150 Elite Deluxe
1984 NH125 Aero
2005 Genuine Stella 2T
2007 KLR650
2002 KLR250
1985 XR350R plated
1994 DR350SE
2004 Concours ZG1000
1987 KDX200 C
1992 KDX200 E
2010 BMW F800GS
Always room for one more.