Catalytic Converter Heat Shield

[hodag]

I have a 1992 Miata that started having a nasty rattling sound, which I traced to a rusted out catalytic converter heat shield. The converter itself looks fine.

I have owned this car since 1996 and have never had any exhaust work done so I assume this is the original converter. I removed the heat shield because it was is pretty bad shape, but I am wondering what do I do next. Can you buy a replacement heat shield? Does it NEED a heat shield if it is only going on short trips? I rarely go more than 5 miles, and this car only gets 4,000 miles a year give or take. I would hate to replace the whole converter just for a heat shield problem.

 

[Kansei]

Chances are you can just order the heat shield from Mazda. Check onlinemazdaparts.com or send a private message to "bagman1" (he works there). I'm sure he can find the part for you if anyone can.

 

[hodag]

Chances are you can just order the heat shield from Mazda. Check onlinemazdaparts.com or send a private message to "bagman1" (he works there). I'm sure he can find the part for you if anyone can.

Apparently the heat shield is not available separately; you have to replace the entire converter. I have seen several postings elsewhere that suggest removing the shield is an acceptable strategy. Does removal comprimise either safety or functioning of the converter itself? Looking at the construction of the shield, I can't imagine that it does much in the way of creating an effective thermal barrier, but it could trap a certain amount of heat inside. I know that some converters work better when hot so I am wondering if the true purpose is to increase the operating temperature rather than to insulate the rest of the car.

Thoughts?

 

[Kansei]

It's there to prevent you from catching a field with tall dry gas on fire.

 

[hodag]

It's there to prevent you from catching a field with tall dry gas on fire.

Then I guess I will have to stay on asphalt and concrete. The old Miata is not so great as an off-road vehicle anyway!