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Old 05-16-2019, 02:54 PM
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Exhaust

How far can I safely have my exhaust (headers) to my fiberglass firewall before I have to add a heat shield?

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Old 05-16-2019, 06:25 PM
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Personally, I would use thermal pad on the firewall if a pipe was within 3" of the firewall.
https://www.summitracing.com/parts/h...hoCxkEQAvD_BwE

Or, you might want to just wrap the pipes with thermal barrier.....
https://www.summitracing.com/parts/dei-010127
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Old 05-16-2019, 06:58 PM
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Don't do wraps or sticky stuff.

Do shields.

They go on easy with ties knocking down heat effectively.

The best thing is that they also come off easy/replace if you have something unexpected happen.

https://www.heatshieldproducts.com/h...ld-armor?amp=1
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Old 05-16-2019, 07:25 PM
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Heat shields

Thanks for the replies. The closest pipe will probably be about 4-5 inches from my firewall. What is the opinion on a metal heat shield?
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Old 05-16-2019, 09:35 PM
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Metal heat shields can work well mount them so there is at least a half inch gap between the exhaust pipe and the heat shield.. You see them on some T's and motorcycles to prevent burns to the passengers.

Sam
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Old 05-16-2019, 10:56 PM
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Quote:
Originally Posted by V8Square View Post
Thanks for the replies. The closest pipe will probably be about 4-5 inches from my firewall. What is the opinion on a metal heat shield?
Think you will be fine, with those numbers. Unless they a cherry red from the ex port out to the first bend.

I guess the real question here is, two fold. What kind of car and how much whoop a s s, is it sporting?

Metal heat shields, never ran any, but on bikes always dug the sound when they are cooling down.



Pep
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Old 05-17-2019, 07:20 AM
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Quote:
Originally Posted by V8Square View Post
Thanks for the replies. The closest pipe will probably be about 4-5 inches from my firewall. What is the opinion on a metal heat shield?

4-5" I wouldn't worry about unless it's adding unwanted heat to the interior of the car, then a heat shield not a wrap.
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Old 05-17-2019, 07:24 AM
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Originally Posted by OneMoreTime View Post
Metal heat shields can work well mount them so there is at least a half inch gap between the exhaust pipe and the heat shield.. You see them on some T's and motorcycles to prevent burns to the passengers.

Sam
Thanks Sam. So, you say at least a 1/2" between pipe and shield, correct? With that in mind then, there should be no problem with the shield 4" away from firewall? Tom
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Old 05-17-2019, 07:26 AM
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Originally Posted by 55 Tony View Post
4-5" I wouldn't worry about unless it's adding unwanted heat to the interior of the car, then a heat shield not a wrap.
Thanks. This is a roadster, so there would not be a "hot inside car" issue. I just don't want to burn the firewall.
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Old 05-17-2019, 07:28 AM
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Originally Posted by rip-tide View Post
Think you will be fine, with those numbers. Unless they a cherry red from the ex port out to the first bend.

I guess the real question here is, two fold. What kind of car and how much whoop a s s, is it sporting?

Metal heat shields, never ran any, but on bikes always dug the sound when they are cooling down.



Pep
It is only three hundred horse

Last edited by V8Square; 05-17-2019 at 07:41 AM.
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Old 05-17-2019, 07:45 AM
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The heat shield will be much cooler than the exhaust pipe. As long as you have about 3 inches of clearance you should be good. Take a look at the exhaust system on a Porsche 911. Just swapped one on a 2003 and the heat shields around the mufflers (right outboard of the heads) were about 2 inches from the bumper cover (plastic).
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Old 05-17-2019, 12:09 PM
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Originally Posted by V8Square View Post
Thanks for the replies. The closest pipe will probably be about 4-5 inches from my firewall. What is the opinion on a metal heat shield?

Having a few fiberglass builds under my wrenches 4 to 5 inch gap is plenty. If needed heat shields either attached to the exhaust or to structure are very effective, it takes remarkably little clearance to the heat source.

I'm not a real big fan of header wraps, while effective they really run the temps on the pipes up to where if you're not using a high quality header you can expect a dramatic reduction in their life span.

Bogie
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