Heat shield

[acr_nick]

Hi can anyone recommend products for heat shielding and exhaust? Trying to reduce some of the temperature of the side sills and thinking of something to place on the inside of the panel or directly on the exhaust itself.

Cheers

[phillpot]

Anything here look useful?



Or maybe this?

[tapkaJohnD]

I presume you are concerned about radiated heat?
The most effective heat shield is distance, as radiation obeys the inverse square law, so the heating effect of a hot source falls as the square of the distance from it. May not be easy to put an exhaust pipe/silencer further away, as that may reduce ground clearance.

Then, an intervening barrier, a heat shield. This will heat up, due to the radiated heat, but can have a larger surface area, so will keep cooler than the original source - heat loss varies as the surface area. Easily made and mounted in alloy sheet, IF space allows.

Lastly, air flow. You'll be aware of the the 'wind-chill factor' that makes cold weather seem colder when it's breezy. Air passing over your heat source, and the heat shield will absorb heat and remove it, so encourage air flow between them.

All a lot cheaper and more effective that expensive heat reflecting or insulating products!
John

[acr_nick]

Thanks John

I really only have the option of adding a barrier to the panel I guess, as I don't want to relocate the exhaust. That would be too expensive and difficult, not to mention laborious. Adding air flow to cool would be nice but would mean cutting the body work, not really willing to Cut.

I think I'll try some of the reflective shielding on the inside and see if this makes it any cooler to the touch.

[tapkaJohnD]

Nick,
If you must use a reflective barrier, then on the outside!

A mirror finish inhibits heat radiation as well as heat absorption, but you want to avoid heating the floor next to the exhaust pipe. The opposite would be matt black, so consider painting the hot surface.

BUT, there are more heat sources than just the exhaust pipe. The biggest of all is the radiator. If the hot air from that is being channelled against your floor, then you may be blaming the exhaust needlessly. If you have an even small air leak into the car from that flow, that can make it very hot inside!
John

[Alpha Omega]

tapkaJohnD said:

I presume you are concerned about radiated heat?
The most effective heat shield is distance, as radiation obeys the inverse square law, so the heating effect of a hot source falls as the square of the distance from it. May not be easy to put an exhaust pipe/silencer further away, as that may reduce ground clearance.

Then, an intervening barrier, a heat shield. This will heat up, due to the radiated heat, but can have a larger surface area, so will keep cooler than the original source - heat loss varies as the surface area. Easily made and mounted in alloy sheet, IF space allows.

Lastly, air flow. You'll be aware of the the 'wind-chill factor' that makes cold weather seem colder when it's breezy. Air passing over your heat source, and the heat shield will absorb heat and remove it, so encourage air flow between them.

All a lot cheaper and more effective that expensive heat reflecting or insulating products!
John

Great post, thanks

[acr_nick]

Thanks John

I really only have the option of adding a barrier to the panel I guess, as I don't want to relocate the exhaust. That would be too expensive and difficult, not to mention laborious. Adding air flow to cool would be nice but would mean cutting the body work, not really willing to Cut.

I think I'll try some of the reflective shielding on the inside and see if this makes it any cooler to the touch.

[normalbloke]

Have a look at Zircotec's range of products. They know their stuff, and are an offshoot of the nuclear industry.