Hey everyone -

Having just swapped a set of turbos out on my car, I'm trying to find more out about how the setup is stock.

My car only came with the heat shield on the back side of the turbine housings that's held on with 2 10mm bolts. Pretty much all used turbos I've seen have had that shield. But, it looks like there is supposed to be another one for the front side, but I'm not sure how it would attach, or if it's designed to attach to the precat.

I'm trying to figure out if it would be worthwhile to track that other heat shield down.

Any pics or info would be super.

Thanks!
Dale

 

Here's a pix. Dale I hope this helps.

Terry7

 

Awesome - thanks! That's what I'm looking for.

The heat shields are barely documented in the shop manual. I'll have to find out if they're available new - I think they would be a good idea to help keep heat down.

Dale

 

Dale,
I was reassembling my turbos just a week or so ago and also found that the shop manual and the parts catalog both lacked good referencing for installing those shields. I put an inquiry out on one of the pieces I couldnt place. https://www.rx7club.com/3rd-generation-specific-1993-2002-16/reassembling-engine-where-do-these-belong-pics-496549/
there is a good pic of one of the shields.
chuck

 

dale,
here is another pic with all the pieces removed and the turbos
chuck

 

Out of curiosity, what are the heat shields made of? Can they be JetHot coated to reduce heat even further?

 

I was thinking the same thing. The inside of the shield is obviously some sort of ferrous material, as it's quite rusty. I'm guessing some sort of stamped steel with a coating on the outside of some kind.

A3DCadman - that's some clean turbos and heat shields! How'd you get 'em that clean, or are they new parts?

Dale

 

I don't think coating them will do a damn thing. Just their presence to reduce convective cooling and radiant heat loss is what they are required for. (This keeps temps in the manifold more uniform - and the non-uniform temps are a major contributor to manifold cracking).

Dale, as far as I can tell they are the standard carbon steel stampings painted silver or plated. The side facing the turbos quickly scales off and leaves a general rust, kinda like what happens to the plated fasteners in the same area. You can wire brush them clean, but it'll rust again. You can plate/coat/jethot them, but I think the shields are just flexible enough that it would crack or flake off.

If you're bored, call and get a price on new ones from Mazda. Makes the manifold studs and nuts look cheap

Dave

PS: they're like $75-150/each piece.

 

Attached is the pic from the parts book, just for reference.

Dale

 

I cleaned up and painted my heat shields using some extreme-high heat aluminum paint. The stuff has a 'ceramic' element to it. You paint it, let it cure for a while, then bake it for 4 hours at 300 degrees and then 2 hours at 400 degrees. Comes out looking pretty good.
I did my waste gate manifold in the same stuff in black just for grins. My turbos and actuators and all that **** are lookin' pretty good right now!
Now all I need is my engine back to start putting stuff back on!

 

They are not new. I used a wire brush and lacquer thinner until all the rust was gone and the surface free of contaminants. I then painted with an ultra hi temp ceramic reinforced paint - 2 full heavy coats. Seems to be holding up for the amount of time Ive been able to run the engine, and it did get very hot with how rich it was running. Unfortunately, the engine is coming out this weekend for a rebuild.

I know that when I had my downpipe ceramic coated by a shop specializing in this type of finishing, they claimed that there would be a marked difference in the amount of heat radiating from the pipe as compared to the same pipe without the coating. The precat was a lot hotter emanating a lot more heat than the coated downpipe. My guess is that coating the shields would probably have a similar effect in addition to protecting the metal from rusting and deteriorating as rapidly from the elements.

chuck

 

What kind is it? Where did you buy it?

 

It would have to be some REALLY good paint - I've used high-temp paint on heat shields on my '88 turbo back in the day, and it maybe lasted a few days before it all flaked off. You really have to use something semi-exotic.

There's one exhaust coating I've used before - can't remember the name right now. You have to sandblast the part first to roughen the surface, then spray it on with a air-powered spray gun. I coated my old HKS manifold and turbine housing on my old '88 turbo - held up GREAT. It's a black satin finish, not sure how good it was at heat rejection, but it was supposed to help with that.

Dale

 

ill look at my turbos and see which heat shields are still on them and post a pic to see if youre interested.

 

Here's the coating I was thinking of - Techline's Black Satin -

http://www.techlinecoatings.com/Exhaust.htm

VERY impressed with how that stuff stuck on and looked.

Dale

 

Just talked to Ray at Malloy about the heat shields. They are all available, yet pricey!

The small one that goes just in front of the downpipe is $48, part # N3A1-13-380. The one that goes under that piece and under the downpipe is (ouch) $102, part # N3A1-13-C80B. The back piece that's held on with 2 bolts that always is around on the turbos is $63, part number N3A1-13-385A.

Dale

 

The paint I used was DUPLICOLOR brand, it is 'rated' to 1500 degrees, which I admit might now last long on the turbo manifold or heat shields....but it looks GOOD right now...lol!

I got it at O'Reilly's Auto Parts.

I prepped by sand blasting with aluminum oxide then glass bead. I hope the stuff works at least halfway decent.

 

Dale, if you need some, I can probably hunt a set up.

 

I used the same stuff. It has the ceramic integrated into the paint. It does look good for now. Ive attached a before paint pic of the turbos for comparison. This is the only hi heat paint Ive ever used that does seem to hold up. How long - just have to see what happens over time. The key to success with paint is proper surface prep and a good quality paint. They have come a long ways since the day of plain old flat black rattle can header paint.

The price for those stamped metal shields is shocking. At that price I would consider fabricating my own.

chuck

 

Thanks - actually already found a set .

Dale