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Old 02-05-2018, 11:37 AM   #1 (permalink)
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Header wrap?

Basic question, has anyone done their entire exhaust in header wrap? I’m guessing that keeping the heat inside the pipe would help the exhaust retain energy and maybe help the volumetric efficiency of the engine...

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Old 02-05-2018, 12:28 PM   #2 (permalink)
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Yep, it will certainly help. How much? Dunno.

Unfortunately, wraps are well known to help your exhaust rot out a good amount faster.
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Old 02-05-2018, 12:45 PM   #3 (permalink)
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Yea it helps. It also helps because it keeps heat out of the cabin. In wet states, on a daily driver, I definitely would not recommend you wrap your exhaust system(don't have to worry about this in Cali). As Doax pointed out, it will accelerate rust due to water getting trapped between the wrap and the exhaust. Now there are Silicone spray lube specifically designed for header wrap to combat this problem, but I have no idea how good it works in a long term scenario, especially on a car that gets driven on a daily basis.
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Old 02-05-2018, 01:30 PM   #4 (permalink)
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I just considered doing some wrap on both of my Ions... at least the header/manifold and downpipe which would be better shielded from water by a belly pan... I also imagine that by keeping the heat inside the pipe I could cover at least my mid pipe with a coroplast belly pan without fear of melting(currently itís open but my mid pan is trashed and could use replacing and solid would be easier to cut and install)

The header and downpipe on my Redline are heavy duty stainless so I imagine theyíd take more heat related abuse...

I was also considering at least a better cast manifold (stock one from Redline/Cobalt SS)for my base model, and a better downpipe with bungs for wideband and EGT... wrapping was a consideration
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Old 02-05-2018, 03:18 PM   #5 (permalink)
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Quote:
Originally Posted by 19bonestock88 View Post
I’m guessing that keeping the heat inside the pipe would help the exhaust retain energy and maybe help the volumetric efficiency of the engine...
Can't see how that would work. Cooling the exhaust reduces volume & pressure - basic physics, no?
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Old 02-05-2018, 03:24 PM   #6 (permalink)
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Quote:
Originally Posted by jamesqf View Post
Can't see how that would work. Cooling the exhaust reduces volume & pressure - basic physics, no?
And slows it down.
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Old 02-05-2018, 04:21 PM   #7 (permalink)
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It also becomes more dense, and thus takes more power to push it out because there is more mass in the system.
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Old 02-05-2018, 04:31 PM   #8 (permalink)
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The idea isnít to cool the exhaust gas, but rather limit the radiant heat loss from the pipe, retaining more heat in the gas, improving velocity and torque...
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Old 02-05-2018, 05:02 PM   #9 (permalink)
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Header wrap also likes to catch on fire when oil gets spilled or leaked on it.
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Old 02-05-2018, 06:54 PM   #10 (permalink)
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Thatís a good thought about oil spillage... I sometimes dribble a little when changing oil... maybe a ceramic coating could provide what Iím after...

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