mazdaverx713b

iTrader: (91)

i have searched the faq's and the archives and to no avail cannot find my answer. what do i need to do or use if i wanted to take an S4 13B and use the GSL-SE's EGI setup? what i'm thinking is that since the SE engine that i recently installed in my 85 GS is junk and i have a good spare S4 13B laying around that i could use the SE front cover, oil pan, flywheel, exhaust manifold, lim, and EGI setup on the S4 13B and hope that it would be a drop in setup..what are your guys' thoughts on this?

diabolical1

iTrader: (3)

it's been a while since i messed with one, but if i recall, you just block off the EGR on the intermediate housing and do exactly what you proposed, use the SE front cover, oil pan, entire intake setup, etc. i suppose you'll also have to use the SE injectors since you'll be limited to running only 2 now.

82transam

iTrader: (18)

Sorry to hear that engine didn't run... This isn't exactly what you are asking, but a while back my friend John64 put a full S4 intake setup on his SE block, and other than a little bit of modification to the LIM it was pretty straightforward. I would assume what you want to do shouldn't be that hard either. I can get in touch with him if you like.

thunkrd

iTrader: (1)

would an s5 intake work on an s3? i think it would i read of people putting s5 on s4.. so if you can put s4 on s3 then you should be able to put s5 on s3?

am i right? i always see fc guys doing it but not many fbs

mazdaverx713b

iTrader: (91)

not sure..i'm going to try and use an S3 EGI setup on an S4 engine.

trochoid

iTrader: (6)

You can use either intake S3/S4. I would use the S4 and set it up with the s3 injectors and MAF. You will need to keep the S4 flywheel.

Rx-7Doctor

iTrader: (13)

Dave,

There are advantages and disadvantages to using the S4 system.

The SE system will bolt on with no real issues. When using the S4 intake on the SE engine you have to block off the exhaust passage for the ACV or it will leak exhaust at that point.

On the Se intake on the S4 engine you may have to use the S4 intake gasket. I have a spare SE intake lying around and a S4 gasket so I will see how they line up and what you need to do and what gasket will work.

The Se exhaust manifold will bolt on and you will use the SE gasket.

There should be no other modifications that I know of to use the SE intake on the S4 engine.



To recap as others have already stated and not to mimic their responses. :-)

List-

Transfer SE front cover and OMP to S4 engine. Use Se OMP rod.
Use S4 flywheel on the S4 engine.
Use either the SE or S4 clutch components (which ever one is in better shape) as they are the same.
Use SE oil pan on S4 engine.
Oil pressure sender unit can be used from either since they are the same.
Use water temperature sender off either one as they are the same.
Use Coolant temp sensor (For ECU) off either as they are both the same
Get block off plate or fabricate for Egr valve opening.
Use SE water pump housing, water pump and thermostat housing.
Use complete SE intake system, injectors, AFM, Rats nest, etc....
Use SE throttle cable.

mazdaverx713b

iTrader: (91)

^^ thanks a ton for the info!!! i didnt know to use the SE water pump housing water pump and thermostat housing! great to know there. as luck would have it i have a spare egr blockoff plate that was installed on my 88 TII that i removed so that i could use the egr. so that base is covered.. next step is to aquire an S4 N/a flywheel. the engine that i have has 66K original miles, runs excellent but is bolted to an automatic trans.

please let me know on the intake manifold gasket interchangability. i'm assuming then that the SE fuel pump will be adequate as its nearly an SE engine anyways.. should i stick with the FC's BUR7EQ and BUR9EQ's or should i stick with the current BR8EQ-14's?

82transam

iTrader: (18)

I'd probalby go with the S4 plugs, and as for the fuel pump yes the SE will do just fine, as you said its almost the same engine.
Just to put this out there you *could* use the S4's water pump housing/pump assembly with a tiny bit of grinding along the bottom where it will hit the SE front cover if you wanted to keep the aluminum setup rather than the heavy FB part...

mazdaverx713b

iTrader: (91)

thank you for the advice. i think i'll just use the FB setup on the FC engine just to make things easier and more "bolt in", though the aluminum setup is very nice and would save some weight.

Rx-7Doctor

iTrader: (13)

From what I can tell you are going to have to use the SE intake gasket. You need to test fit the SE intake on the S4 engine and see how it covers the sealing area.

Since you have an automatic out of the S4 you could use the rear counterweight and get a lightened steel flywheel if you wanted to.

The SE fuel pump actually puts out more than any of the other Rx-7 ones including the Turbo models.

Personally I would run the 2nd gen leading plugs with the 2nd gen leading coil and the stock SE plugs on the trailing side. But you can run the Stock SE plugs on both if you want to.

Remember the engine is just that, an engine and has no memory that it is a 2nd gen engine. It is the ignition system and ECU that controls the fuel and spark.


Forgot to ask what did you find wrong with the SE engine that you were going to use?

diabolical1

iTrader: (3)

the weight is minimal unless you're building a dedicated track car - where every little bit counts. for what it's worth, my brother runs a Gen II pump and radiator on his Gen I and i could ask him what he did. i didn't really care enough to ask about it because i felt it was negligible for the street.

as far as the plugs are concerned, i use the single electrode plugs exclusively now. i was convinced that they were better when i had so many flooding problems with my Dell'Orto and the B_EV plugs just would NOT foul under any circumstances, i understand that i'm biased now because of it and i hope you can make an objective decision, but i just want to put it on the table for you. by the way, i use 7 leading and 8 or 9 trailing.

wish you all the best.

mazdaverx713b

iTrader: (91)

thank you for all of the responses!!

Doc, i ran a compression test on the SE engine and i couldnt even get the needle to move on the front rotor and the rear rotor measured about 65psi..

thunkrd

iTrader: (1)

that really blows, literally. what will you do with the s3 motor then?

doc got a bigger pic of your dog? that one in your sig looks cute!

mazdaverx713b

iTrader: (91)

in time i will rebuild the S3 engine. right now i cant afford to be spending a lot of money on what my wife considers "another toy". she was upset that i bought an engine that didnt run. i trusted the guy i bought the engine from. i've dealt with him for awhile now and he has always been true to his word. perhaps this was an oversight on his part...or that the engine has bee sitting so long that the seals are all stuck internally..

82transam

iTrader: (18)

Have you tried to free the seals up with ATF or MMO? Might be worth a shot before doing another swap.

mazdaverx713b

iTrader: (91)

i've had some atf in it for a litte while. maybe not enough though as i didnt want to swell the oil control rings and the o-rings...i think i might have gotten a 0 psi reading on the front rotor because it was terribly flooded..a retest is in the offering thoug i am prob just going to swap it...

Unsupa

iTrader: (2)

i did this years ago... Wasn't too difficult.

I kept the SE injection, but used the S4 Leading coil and s4 spark plugs. had to swap the front cover, oil pick up tube and oil pan from the SE motor to the s4.

I blocked off the ACV and EGR valves with some plates.

I used the S4 intake manifold, and just plugged up the secondary injector ports. Throttle cable on the SE fit just fine.

I even kept the rat's nest from the SE intact, i found the diagram on this site to show you which hose goes where.

I think the only real issue i had was the timing. be sure you're at TDC when you pull/put the dizzy back in. had to search on here to figure that one out too. heh

I have pics at the house, i'll post some when i get off work.

TeamSMS

I'm going to be getting a s4 n/a engine & wiring harness soon. Gonna be running s3 efi until i get the s4 afm, ecu & coils. I will try to get some pics of the whole progress.

mazdaverx713b

iTrader: (91)

thanks for the info!

i'll keep you guys posted on what i decide to do. i've got a lead on another SE engine thats about an hour or so away from me. claimed low mileage. has been sitting indoors for a few years.

thunkrd

iTrader: (1)

any info? will you not put the s4 in there?

mazdaverx713b

iTrader: (91)

no S4 is going in the S3 build. i found another S3 EGI engine locally and sale is pending on the S4 shortblock..