Greetings all!

This is my first thread(of many more I'm sure). I've got quite the project going. Its a 1988 NA SE, automatic-to-manual, All cermet coated 13B /w S5 Rotor housings, and an S5 intake and possible? computer converssion.

I have a couple questions about the type of seals and other stuff to use in the engine since its kind of a S4/S5 hybrid.

So far, here are the recomendations I've been given to use/not use, and what I'm still undecided upon:

1. I've been told not to use use RA apex seals because they wear a big step in the housing from the wide type endpiece, instead, use Rotaryengine.com's apex seals because they are full length and use stock endpieces. Is it true about RA seals wearing a step or causing excessive wear?


2. I'm a little worried about using Rotaryengine.com's apex seals because they come with harder-than-stock dual springs. Will the extra spring pressure be benificial in my NA?

3. Should I use solid cornerseals?

4. Should I use the 93-95 type of corner seal springs?

5. If I swap on the S5 intake, should I get the S5 gasket kit? What else is different between the S4/S5 kits other than the intake & OMP gaskets?

6. I've been told not to bother putting in the S5 computer. I have an S5's computer, harness, alternator, front cover, OMP, complete intake, complete fuel rails/injectors, and complete vac spider sys.
What else would I need to make the S5 computer work?(I know the S5 computer is just as outdated & ornery as the S4, but let's just pretend my S4 comp is fried )

Well, thats about all I want to cover in this thread. Many thanks in advance for the helpfull input/advice everyone!

Trueblue707

 

Dont use the S5 ECU because all your running is the housings... if you had S5 rotors and stationary gears then it would be more benificial... stick with STOCK apex seals.. unless you wanna rev really high. but i doubt you do.

You can put the S5 intake manifold on it fairly easy and gain a few HP. But your better off with the S4 AFM even tho its ugly.

 

Is there a way to modify the S5 afm to work with the S4 comp?
Would it be beter?

 

S5 AFM dosnt flow as well as the S4

 

For your #1 above, it's flawed reasoning to think the RA seals are the only ones to wear "steps" in the rotor housings. Even the stock OEM seals (with the small end piece) wear BOTH ends of the rotor housing, due to the tiny rocking motions caused by the center pivot characteristics of the springs (my theory, anyway).