I was reading the thread on the archives about this, and following BDC's instructions (http://bdc.cyberosity.com/v/Technical/RollPin-Removal/ ) , sadly, couldnt get the bastards rollpins out. So i was looking for an easier way and decided to try a method mentioned on nopiston.

With this method, your sleeves will become uselless (i didnt care because i will replace them with the wingless sleeves ) and it took me less than 15 min to remove them.

you will need only these tools.
-dremel, with a thick cut off wheel, or a bunch of thin cut off wheels together.
-hammer
-screwdriver with the top cut off



cut a groove on the inside of the sleeve



then hammer the rollpin down with the screwdriver, use wd-40 on the screwdriver so slides back out easily.


and thats it. One more thing, if you dont over cut/grind the groove, you will be able to reuse the rollpins.

 

The easiest way for me was to use a mig wire feed and weld a blob into the roll pin hole. Then just grab some vise grips and pull. The weld doesn't stick to the aluminum. You can re-use the pin if you grind the metal off. The whole thing took about 5 minutes.
I got the idea from a thread I saw on here but I don't remember who said it so I can't give proper credit.

 

good writeup...


But does doing this make any difference?

 

first time i ever saw that technique described was judge ito over on nopistons...

 

I believe the point is to install the turbo sleeves that have no diffusers. It will have better exhaust flow and make it much easier to port the exhaust if so desired, but will also be louder. I personally just bypassed it and used turbo housings on my rebuild.

 

using turbo housings works but the reader should be aware that the turbo housings have coolant ports where the NA ones have blanks, so using the turbo housings in NA application requires plugging the coolant ports that in turbo application feed water through the intake manifold to the turbocharger.


edit:

here are some photos illustrating the plugged ports, note the anodized blue hex socket aluminum NPT plugs.
http://pengaru.com/~swivel/cars/rx-7/pics/04-08-2003/

 

Just use fd housings. No water ports

 

You people that say that you pull them out with vise grips must be he-man. The times that I have pulled them out via a screw or a weld, I had to use a claw hammer and all my might to pry them out. I have **** for luck trying to get these little bastards out, and I have plenty of bad housings to practice salvaging from. By my own admission I am not a trained welder, but no matter how many tries I give it, the weld breaks off at the rollpin which is usually below the housing surface a good 1/8". I have yet to find a source for screws that do not strip, zinc or otherwise.

This method for getting the old NA sleeves out is fine, but what happens when you want to remove the donor sleeves from the turbo housings? You're still stuck finding another way to do it, so why even bother with this method at all?

 

i pull them out during porting on rebuilds, i use Itos method with the weld and vice grips and it works well.

key is to twist before pulling.

if the spot weld breaks continuously then your welder just sucks.