I am porting my 88 TII and I would like to know how to remove the sleeve from the exhaust port. Also I would like to know if this is a good idea or not (give me the pros & cons)

Thanks Guys
Warren

 

if your exhaust port looks like the one on the left, it is not a turbo rotor housing, its a N/A housing.


Some of the early first gen RX-7s had a sleeve in the exhaust manifold. I don't think the 2nd Gens use that, so I think you are talking about the picture above.

Some people cut that thing out. Its called a difuser. Other say it will cause exhaust flow turbulence. Its hard, so you will need to grind away at it for a while. It you take out the whole metal insert, then too much heat could transfer into the aluminum housing. I haven't heard any concrete evidence of any damage done by doing any of this, and I have heard of people doing it.

 

The insert, and the pins holding them in are SUPER hard, i had to use carbide to cut them, you can grind through the sleeve untill you see the pin, and then tap the pin out.

 

I think he means the entire iron/steel sleeve the part that is not aluminum...I sure it can be done but I have know Idea on how to go about it

 

once its out, you can put it back, or leave it bear aluminum, or ceramic coat the aluminum. bare aluminum will put more heat into your coolent.

 

i just removed an insert out of curiosity from a dead housing. all i needed was a drill bit a little over 5 millimeters and a drill press. the sleeves are held in by spring pins on both sides, which go through the housings and about half a centimeter into the sleeve. on one side, it took a bit of wiggling and coaxing to get the pin out of the sleeve, and i eventually just used a slightly larger bit and it came out.

putting it back in i guess would take some figuring. i'm thinking slightly oversized solid aluminum pins hammered in... shouldnt be too much of a bitch.

i can't tell you if it's good or not... just how to do it.