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Old 07-03-2016, 12:28 AM   #1 (permalink)
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Exhaust covering: Solid or Perforated metal?

Curious on this. Is it better to go with a solid meet metal (aluminum or steel)...



or keep it holey?



Seems holey would allow breathing in terms of heat and reduce a tiny amount of weight, but perhaps it would be bad for aerodynamics? Or would it?!

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Old 07-03-2016, 04:16 AM   #2 (permalink)
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I have seen people put expanded mesh over exhaust. I would think the perforated metal you show would be better because expanded mesh is three-dimensional. I do not know if mufflers can get too hot like catalytic converters can. From what I can see on the web, that is not considered to be a problem.

NACA ducts?
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Old 07-03-2016, 04:19 AM   #3 (permalink)
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I have seen people put expanded mesh over exhaust. I would think the perforated metal you show would be better because expanded mesh is three-dimensional. I do not know if mufflers can get too hot like catalytic converters can. From what I can see on the web, that is not considered to be a problem.

NACA ducts?
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Old 07-04-2016, 12:55 AM   #4 (permalink)
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Just for underbody panel exhaust covering. Coroplast works great, until you throw a lot of heat at it! So the exhaust tunnel will need some covering if I want to max out my aero capabilities.
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Old 07-04-2016, 11:02 AM   #5 (permalink)
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Aerodynamically, it is a semi-permeable membrane. Size/spacing of the holes could vary and there will be some optimum.

It could serve to vent engine compartment air.
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Old 07-04-2016, 11:46 AM   #6 (permalink)
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When I made a full belly pan for Turtle, I used an aluminum sheet under the cat and pallet liner under the exhaust. It's been on the car for way over a year with no ill-effects. Actually, the whole belly pan looks about the same as it did when I installed it.

I can't stress enough how awesome the pallet liners are to work with. They are way stronger than the coroplast you get at Home Depot and they haven't shown any signs of wear from road debris (and they're two bucks each!).

http://ecomodder.com/forum/showthrea...tml#post507791
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Old 07-04-2016, 03:56 PM   #7 (permalink)
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Sorry for probably dumb question, but where you get pallet liners? Here in our local equivalent of wal-mart are used thin cardboards.( at least where I asked).
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Old 07-04-2016, 05:50 PM   #8 (permalink)
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I did the same thing as cowmeat. When pulling a heavy trailer at high speed through the mountains for several hours, the floorboard gets warm, but otherwise I've seen no ill effects.
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Old 07-04-2016, 05:58 PM   #9 (permalink)
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I looked on my Craigslist for pallet liners and found a pallet jack. I don't care if it is four hours away! Can I use that to move my neighbors' cars?

No actual pallet liners, though.
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Old 07-04-2016, 08:54 PM   #10 (permalink)
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Exhaust pipes do not generate heat the way a converter does burning excess fuel. Light aluminum sheet and gasket paper makes a great heat shield. If coroplast (it comes in various thicknesses) is not strong enough get some 0.062 ABS from a supply house.

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