it's looking like my motor is finally on it's way out and i'm looking around for a replacement 13b.

how much of a pain is it to swap an S4 NA motor into an -SE? if i found a deal on one, i would consider it if it wasn't a huge problem.

or would it be better for me to hold out for an SE motor?

 

just get your motor rebuilt and use 12a plates so you could make a 4port out of it

 

S4 motor goes right in I belive, and has lighter rotors
Making a 4 port with 12A side housings would be prety bad *** with a big street port (thats what I'm doing next time)

 

but to save a lil dough, getting the motor rebuilt along w/ streetport will save you some money, rather than getting another motor and start from there

and 12a plates not that expensive either

rotors --- if you have some spare dough, might as well go s5 rotating assembly

 

why not do a 13B 4-port with Streetport it. A large streetport. Badass is all Ihave to say. it'll roump

 

by getting the 12a plates you could make a 4 port GSL-SE motor

 

An S4's fuel infection is a bit different, so I don't know if you're going to want to go through the trouble of upgrading. Will you keep the dizzy? Or go with a CAS? Aftermarket ECU? Gonna do a carb? A Weber DCOE on a Racing Beat upper manifold will bolt to the stock GSL-SE or S4 lower manifold. You could get a Mazdatrix header with the backpressure sensing bung (instead of the Racing Beat presilencer with the bung way back there). Don't bother with the S4 air pump. Does it need to pass emissions? Gonna do a supercharger some day?

 

jeff, how do you mean diff. fuel injection? are you pertaining to the s4 FI setup

SE's have a much better and higher flow rate than s4 or s5 n/a

 

That's what I did with my Engine

GSL-SE 13B with 12a Plates and turned it into a 4port and Ported the Living Crap out of it.

www.swimhurricanes.com/rxpage.htm

 

True, but they also only have two injectors. Hmm, that's what I get for hanging out with the 20B crowd for so long.

 

All you need is a 13B rotating assembly, 12A plates, and two 13B rotor housings. Easy as pi.

 

i'm very happy with how the car performs stock, so i want to make this as easy and inexpensive as possible. will the SE goodies (intake manifold, fuel injection, etc) bolt on and work with an S4 motor? i assume they won't. i want to keep the car fuel injected which most likely means using an aftermarket ecu if i go FC style, which adds to the cost.

it'd be cool to make a 4-port out of the 12a plates, but a. i don't think that using my old housings would be a good idea considering they have a shitload of miles and b. i want to keep the fuel-injection intact.

 

the S4 is a noble idea, but remember the 2 piece apex seals. not great in my opinion. i would just stick with the 6 port. a downside to that is not really being able to port the engine much. you could swap in the S4 and its injection components with little trouble. your call.

 

dp

 

ok. is it possible to run an S4 motor, use the SE front cover, upper and lower intake manifolds, throttle body, and the rest of the SE fuel injection system?

if it bolts right up with just the front cover mod, i can see this as being an option, esp. since the S4 motor has slightly larger ports...

what say you?

 

Do it!!! I can't think of a reason why it woultn't work.

 

anybody else? this determines how i conduct my search for the new motor action

 

Heres a picture of a GSL-SE gasket against an S4 lower intake manifold. The primary intake ports do not line up and the S4 engine does not have the rectagular split air port in the center housing, they are on the sides so if emissions testing is a requirement youre outta luck.
If you really want to use an S4 engine then go with the S4 intake manifolds as well.

 

edit.. wrong info

 

How will a T2 manifold bolt up to 12A plates?

 

could i mount a SE throttle body onto a S4 intake manifold, then?

 

not hard to do with proper planning and patience...grind, weld and drill new mounting holes...thats how its done when doing a blow thru turbo on an old 13-B 4port block. Thanks to Rob @rotaryshack for the advise. Now my son's new motor is a blow thru turbo in the making.

 

No.... just do this:

https://www.rx7club.com/forum/showth...d&pagenumber=1

 

I think there's some S4 conversion info in here:

http://www.mazspeed.com/forum/thread...w3fb7a9u9qgsei