Exhaust rattle!

The chrome-ish finish has patina-ed a bit with a few thousand miles and I think that's good. No regrets on the coating after a couple of years.

I did miss putting one part of the exhaust system in the ceramic coat batch. And of course the heat shield rattles. I did the hose clamp thing to get it to stop. So far it works.

The heat shields are surprisingly difficult to remove. I can't imagine doing it in the car. But the rattles from the shields are now gone. Now I just have to chase down the dozens of other rattles. These cars were designed and built to rattle with aluminum panels riveted on and hoses resting against panels.
Image Unavailable, Please Login
Image Unavailable, Please Login

 

I had that problem in my '75 GT4. Drove me crazy until I discovered it was the ac hoses running on the upper frame brace. It happened right at 2,800 to 3200 rpm's. Wore through the padding I out around the hose and came back so I tried moving the connecters a little and using zip ties. Well see if this is the best fix.

 

Not at all. How do you come to that conclusion?

 

I didn't come to a conclusion...See the question mark?

 

They aren't mutually exclusive, just the same function as viewed from both the inside and outside. Think of the heat shields at their most basic as barriers (aluminum isn't a great conductor). Shields keep heat radiating off the headers internally trapped inside them - with the aim of keeping the exhaust as hot as possible when it hits the cat - and consequently they ALSO keep the heat from externally radiating out into the engine bay.

What some have actually measured, though, is that quality ceramic powder coating does an even better job of keeping heat inside the exhaust pipes than OEM fibrous wrapping and thin, sometimes-flimsy heat shields.

To Kim's earlier point, if you drip fuel onto an aluminum heat shield, chances are the shield is less hot than a header itself, so there's less chance the fuel will flash and consume your engine bay in a fireball. However, if you have a fuel tank weeping, it will drip onto the lower "collector" part of the headers (where the pipes bundle together), whose heat shield is conductive hot steel. Maybe it will hit the extension pipes, if you're lucky, but those get pretty hot, too. If your filler neck is leaking, you'll be dripping onto either the hot engine block near the upper fuel lines or the same hot header portion. And if your upper fuel hoses are leaking, you're spilling fuel onto a hot engine. In other words, you're a ticking time bomb if you've got a fuel leak in your engine compartment. Aluminum heat shields won't save you. But they do preserve the OEM look, and are functional. How you want to resolve the rattling is another story; they don't get less brittle or better welded with time.

 

Looks vastly better

 

I don't agree.

I have crewed on 2 different land speed record cars, one a Rodac Chevy making 750hp the other a turbocharged Falconer Chevy with 1300 hp. Both engines and exhaust systems were totally enclosed with very little airflow around the motors. No coating was able to prevent fire inducing heat. The only thing that worked is fiberous header wrap and not even as good as the Ferrari factory insulation. With header wrap even plastic survived the engine bay temps we had.

Externally applied insulating materials work and work very very well. It is what is used in applications when the heat is very high and the alternatives are an engine bay fire.

 

Mine was removed, ceramic coated, more room for ventilation & sounds much better
Image Unavailable, Please Login
Image Unavailable, Please Login
Image Unavailable, Please Login

 

The relevant thread I was looking for...

http://www.ferrarichat.com/forum/308-328-sponsored-yellow-compass-group/437942-exhaust-headers-wrap-not-wrap-question.html

 

I have used previously Zircotec on a mate's car for Drifting and they're a completely different process:
https://www.youtube.com/watch?v=KdsAtU3VzAM

Against Jet-Hot, or what they call Cerakote:
https://www.youtube.com/watch?v=UamrlZXH69E&t=6s

Cheers

 

I used ST Steel wool and stuffed it in between very tight where it loose no more rattles at all been in there for 6years

 

Sigma...now that's using your head...Good Tip!