just wondering if any one tryed to make some DIY 6 port inserts, i removed my 6 ports , unless i am above 5.5k rpm its kinda sluggish, i have yet to see how my drag times are effected, (1/8 best is 10.02). if any one has there own or the pineapples i loved to seee some pics thanks!

 

I think I remember seeing somewhere in the racing section where someone removed the sleeves and smoothed out the runners with something, teflon IIRC. Search there.

EDIT: Yup, found it:
https://www.rx7club.com/showthread.p...5355&p=3138152

 

there's a little something in the RR rebuild video about doing something like that. i forget what the material that was used.

 

just DO NOT use JB WELD!

 

those are really nice ways to do it, but i was looking for an alternative that would not require removing the engine, when its time for it to be removed a turbo II is going in... i just wanted to convert my sleeves like pineapple did theres, mite as well send them to them i guess, hell its 50 bucks after all... :P

 

Why bother? How much is your time worth for just messing around when U can buy them already done?

Ramses666

 

I have had 2 different RX-7's that I have used epoxy to radius the sleeves. There is no problem with this method when you do it properly. You need to make sure the sleeve is absolutely clean. If you wouldn't drink out of it, it isn't clean enough. I used Devcon plastic steel epoxy putty. In 5 years there has not been a failure.

The bad news is that with the sleeves working properly, there isn't a noticable power gain. The rotating rods that actuate the sleeves run right through the air stream. This blocks and disrupts the air so bad through the upper runner that the rods make more turbulence than the stock sleeves ever did. On a flowbench it is about 1 cfm more flow. I wish I'd have tested back before I had done this. Without working actuation and the rods removed from the airstream, a radius does provide a benefit. Save the time and effort. Leave them alone.