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Thread: Exhaust wrap length calcs

  1. 17th August 2015, 04:52 PM #1
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    Exhaust wrap length calcs

    For those of you who've wrapped your exhaust, how much tape did you find you needed? I've had a look at all the old threads I could find on this but didn't spot this one.

    I have a 110 Puma and at the very least I'd like to wrap enough to take care of the front half in order to reduce the heat in the cabin.

    I'm about to order this stuff on ebay and am unsure how many rolls to buy:

    Exhaust Heat Wrap Titanium 15M X 50mm Roll 10 Stainless Ties Insulation | eBay
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  2. 17th August 2015, 05:09 PM #2
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    one would be heaps if you do a half width wrap like i normally do...
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  3. 17th August 2015, 05:20 PM #3
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    Id probably start mathematically with C=2 x pi x r (although there is probably some hectic calculus or something to work out the helix length... but that's beyond me)

    On a 2.5inch OD pipe, this means nearly 40cm of length per wrap.
    I'd probably also factor a 2x fudge factor for 'overlap' and probably blow that out to 3x for sharp bends etc where the wrap is not as uniform. Leep in mind your 50mm width of the wrap as well...

    Then it's a matter of getting under there with a piece of string or something to measure your linear length.
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  4. 17th August 2015, 05:27 PM #4
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    Cheers guys. Yeah, TA, I'd do that but I'm away for work and was hoping to see this land about the same time I do so I could get stuck in straight away. And I didn't even know it was 2.5".
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  5. 17th August 2015, 05:38 PM #5
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    You miscalculated a little. You must have used d not r in yout calc. So its about 200mm per wrap...
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  6. 17th August 2015, 05:55 PM #6
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    So, sanity check on this, anyone?

    (All measurements plucked, and no allowance made for bends)

    2 x 3.142 x 35mm = 220mm (approx.)
    110"/1.5" (allowing 0.5" overlap with 2" tape) = 73 wraps (very approx.)
    73 x 220mm = 16.06m

    Leave out the last section, joints, awkward spots, and that one 15m roll looks pretty close as Inc suggested.
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  7. 17th August 2015, 06:58 PM #7
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    i went from the bottom of the manifold to just past the transfer case and used less than 15m doing a half widt wrap which means you end up with a double layer of it...
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  8. 17th August 2015, 08:51 PM #8
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    25' * 2" did from the central muffler to past the firewall, 15m would be better.
    Also used stainless steel hose clamps and wetted it first.
    Makes a big difference
    Exhaust Wrap Calculator
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  9. 17th August 2015, 09:04 PM #9
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    Quote Originally Posted by manofaus View Post
    You miscalculated a little. You must have used d not r in yout calc. So its about 200mm per wrap...
    Yes you're right.
    I can't brain, I have the dumb.

    I also used a 2.5 inch pipe as an example not sure what applies in this instance but it's a fairly common pipe size.
    -Mitch
    'El Burro' 2012 Defender 90.
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