I am wondering if there were supposed to be black holes there.

Were there supposed to be cutouts there?

I know when I first put the header on there. It was quiet,but it got louder and louder, untill I get fed up and took it off.

Please somone update me on the information.

nick-

 

Sorry I forgot to add, It is a 1984 12A

 

The old exhaust manifold used those ports, the header doesn't. If you had leaks, either the mating surfaces were not clean/flat enough, or the exhaust nuts were not torqued down to spec. There is also a chance thay the header flange is warped.

 

I had the flat side against the engine, was that wrong? Also, I am gonna order some new flanges. I am going to buy another header one day, The car doesent move but once, every two weeks. I checked the compression while the header was off, and it accedintly started up. : )

I am wondering if the exhaust header shouldve had those ports or something. Does anybody know where I can get the same bolts and washers. I dont really want to buy them from lowes. they seem to strip out easily. I want heavy duty nuts.

 

here are the pictures of the header.

Also is there supposed to be a hole on the side. Its the size of a nail, but it goes through.

any thoughts?

 

That's not a header, it's a stock exhaust manifold, and apparently the wrong one for the engine. It does not have the port holes tomatch the ones on the housing. What was changed on the engine/exhaust?

 

heh, you tell me. It had an odd muffler on there before I got it.

 

what manifold do I need.

 

So the exhaust manifold should have those two ports in it, or did Jose (the previous builder) use older (i.e. SA 12A) housings.

Also, Jose told us it was a jspec motor when I asked about a year ago...any difference in exhaust manifolds there? I know emissions are different over there...

 

kgray may still have his SA mani that I took off when I installed his headers. I don't have one in the shop. I do know the earlier, 74-78, 13Bs had that port drilled and the 12A housings I have don't have the port drilled.

Installing a header will remedy the leaks

 

Lamens terms?

 

It sais 12A on the block, here are the pictures

 

 

http://www.mazdatrix.com/e6.htm


I have discoverd that all this time I have had an older 12A, I thought it was an 84 this hole time.

 

anybody wanna update me on what engine I have : ( , or what manifold I need.....

 

Yep, those are the older housings, pre-7 I believe. One option would be tap threads in the port, screw a bolt in, then cut it off flush with the housing. Easier way would be installing headers. Third option is order the Mazdatrix header flange, install longet studs and 2 gaskets.

 

I think ill go with option 2. does racing beat sell it? and if so, what year do I need.

 

Trochoid, what would happen if I block those ports off?, Does the header allow the port to flow freely?



You have over 4,500 hundred post so everyword you say I listen.

 

All the header flanges I've seen block off the 2 ports you have and the rectangular port the later engines have. They usually have the same footprint that the gasket does.

 

but why would they put the actual ports on there, if they were to be blocked off.

 

Pre RX-7 engines has MAZDA, NOT mazda

 

it sais mazDa, what year engine is that wacky. Do you know?

 

I can't see the pictures you posted of your engine, but I can tell you it's got 76-'80 rotor housings. Those holes were for a thermal reactor. Just get a header that matches the chassis year of your car. Done. By the way, the header is longer than your exhaust manifold.Trochoid, the intake manifold blocks the rectangular port on later engines, not the exhaust. While it's true the header kits sometimes come with an ACV blockoff kit, depending on which you get, it's only usefull if your intake manifold has the casting down there to cover the rectangle hole. The '79-'80 intakes did not have that casting.

 

So its a 76-80 engine, can you give me a link on what header I need. I really dont want to block off those ports, I was reading up and it said they are made to quiet it down a little.

Its an 84 car. lol Brb, Ill go get pictures.

 

here is the engine, with the carb top taken off so you can see better. /\/\/\



here is the actual car






You have to forgive the unwashing of the car.