car is 86 gxl n/a
engines involved are complete 86 na and complete(fairly low mileage) 91 na
i need egr for smogging so s4 intermediate iron will stay.

ok, got my rebuild kit (decided to go with RA basic kit). so its 2 weeks left until my first rebuild. got an experienced fellow rotorhead to help me out (thanks karack). now just to be careful about what is interchangeable/to use in terms of the irons and housing.

so here are the combination i thought. if anyone could correct them, really appreciate it. by the way, i have a spare (new exedy S5 clutch (kit) for my bro's 90 gtu, he totalled the gtu so now it has no home.) anyway can I use it with some changes in my engine parts. don't know much about flywheel interchangeabilities and if i would need an s5 flywheel to use the clutch. i do have an S5 tranny (GTUs one) that i could swap over if i need an s5 tranny for it to work. im assuming i can use the s5 tranny even if i go with the ACT direction.

other option is get ACT HD clutch kit.
performance organic street disc-$324.39 but $291.95 after 10% sale discount(<--thinking bout this one)?
prices found at prostreetonline.com

if anyone know where i can find it cheaper. these are the best prices i've seen/found yet.

ok, so here are the combinations. tell me if they work or not and which parts i can interchange. ie. eccentric shaft, flywheel (if need to for the combos). probably use the less mileage S5 parts i guess.

1. use s4 front, intermediate, rear irons with s5 rotors & housings with s5 counterweight. which flywheel to use, s4 or s5.

2. use s4 front and intermediate iron (smogging reasons) with s5 rotors, housings, rear iron, counterweight, flywheel (so i can just use the s5 clutch).

3. or recommendations on major parts from both s4 and s5 engines to make an overall bettter engine. i still need it to go into an s4 with s4 accessories, including egr.

i was thinking of just rebuilding the s5 and using the s4 front iron but i still need the egr. which counterweights to use with which combo.

this is kinda long but anything would help.
thanks.

 

so nobody has any advice? i guess i will just see what will fit and go with that.

 

Counterweights and flywheels are matched to rotor (weights).
So they depend on what rotors you are using.
Housings have nothing to do with the balancing.


-Ted

 

thanks for clarification RETed

i guess that was a lame statement.

using the s5 rotors. i will need just the s5 counterweight and flywheel, in terms of the big parts. and if using the s5 flywheel, when i get a clutch, can i pretty much get one that includes 86-91 or it has to be for s5.

i read on another thread that all the 2nd gen NA trannies are interchangeable so i can use the good s5 tranny i have instead of my notchy s4 tranny?

 

It's dependent on clutch manufacturer.


That is correct.


-Ted

 

You must use the s5 tranny mount! I am sure you know that but i just want to give you a bump since i am going to do a s5/s4 engine rebuild soon. Are you going to be running a s4 or s5 computer? Would have to run the s5 computer since the compression will go up? Would the NOx reading will be within CA smog limit? (since i saw that you live in CA). It would be cool if you can up date me with your progress. THanks!!

 

you have to use all rotating parts as a matched set. either all s4 or all s5. (except e-shaft, one or the other series is stronger tho, but i dont remember which. ted?)
housings dont make any difference. trannies are interchangeable. i thought the clutches were all interchangeable, but ted says no, and he usually knows what he's talking about, so i guess not all aftermarket ones are.

smog has nothing to do with engine guts, its the ECU that is different on CA cars. if you change ECU's you will have to get a CA one. i think thats the only difference, but i cant be totally sure... never even been to CA.

pat

 

The technicality is the S5 NA clutch disc is thicker.
Some aftermarket clutch manufacturers will have different applications for S4 NA versus S5 NA.
And yet, some will quote the same part number for both S4 and S5 NA.


-Ted

 

i pretty much have all the parts ready, just waiting for school to get out. need to pick up the clutch (ACT ZX2-HDSS - for model 1983-1992) this weekend. the only thing left i need to grab are some solid motor mounts (know anywhere i can get nice ones for cheap and fast). alum or poly type(<--swaying toward this one) or any other recommendation?

so i can pretty much go with the S5 flywheel and all rotating tag-a-long pieces. i would like to have the stronger components of the two engines if possible.

i will have a month for winter break but im hoping to get it done in 3 or 4 days..with all the scrubbing that needs to be done. i wanna go spend some quality time with my lady for New Years.

yea, thanks for the reminder about the tranny mount. i will do that. i'll keep you updated.

 

i doubt either one is significantly stronger for an n/a's applicability unless you planned on turboing or supercharging it in the future. just be sure to get all the other pieces as well such as the front pulley hub, countershaft, etc., since the timing marks are probably slightly off due to the compression variances.

 

i'll need to look through the FSM and haynes manual again for reviewing purposes and my own piece of mind. thanks guys.

 

well actually the marks should be set at zero so it shouldn't even matter about the hub but it's usually wise to keep oll rotating parts together as a set to be sure everything is in balance, when things get thrown together even if you do try to take all things into consideration you can still wind up with an anomoly. so whenever possible i try to keep things as a set, all the housings though can be tossed in whichever way you want though so long as they test ok.

 

i guess im going to go with the banzai poly motor mounts. karack, i should have all the parts ready.

 

actually, there is one exception with the housings. you can't mix rotorhousings. you have to use both s4 or s5. apparently there is a slight timing difference, so if you use one of each, it can cause problems.

 

oh yea, i knew that about the housing. they'll both be S5. i just wasn't too sure about the different iron combos and flywheel and counter weights.