Mazdax605

iTrader: (5)

Hey guys,

I got a spare engine with the RX-4 I bought in November,and was told it is a GLS-SE engine,but I really don't know for sure. It looks like one,but I have little experience with the -SE. Here is a pic:

DarrenTRS

iTrader: (1)

Hope this helps.

GSL-SEs have the emissions port in the center iron:


S4 and 5 have them in the center as well as under the 5+6 Ports:

Mazdax605

iTrader: (5)

It is like the top gasket.You might be able to see it here.

Crit

iTrader: (6)

Yeah man, it's a GSL-SE engine.

84stock

iTrader: (5)

take a close up of the intake ports on the end plates and center plates, then we can make sure.

workinprogress80

ya its a gsl-se, it has the injector ports in just the center iron

3rd and final 7

iTrader: (9)

if it was a s4 engine it would have an egr valve on the top of the center housing. its most likely a GSL-SE engine bc if it was a S5 it would have a electric MOP on the front cover, its possable thats its S5 w/ a SE front cover but doubt it.

84stock

iTrader: (5)

if the front and rear plate have what look like rings around the ports it gslse, if they are flush and flat its s4 or s5

Jeff20B

iTrader: (13)

It;s definitely '84-'85, no question. You now have two options; GSL-SE or RE-SI. In an RE-SI, the primary intake ports are smaller and the exhaust ports open and close early with 12A timing instead of late timing of a GSL-SE. Show me a close-up picture of an exhaust port and I can tell you.

mazdaverx713b

iTrader: (91)

no doubt that its an 84-85 13B.

j9fd3s

iTrader: (3)

yep.

its got gsl-se rotor housings, no egr port in the center housing...

Mazdax605

iTrader: (5)

Now what to do with it? 4-Port 13B using the spare 12A irons I have from a 79 12A.

Mazdax605

iTrader: (5)

Pics of exhaust ports for Jeff20B

trochoid

iTrader: (6)

Sure. Do an sp primary port, bp secondary port then find the RE dual DCD carb setup for the 13b. It will behave like an sp until the secondaries of the carb open, then hang on. If you can't find the DCDs then stick with a full street port.

Mazdax605

iTrader: (5)

Bump for Jeff20B. Can you tell from the pics of the exhaust ports which engine this is? We know GSL-SE,but you had a question regarding the exhaust ports.

peejay

The main GSL-SE engine identifier is that it has the engine mount **** between the exhaust ports so you have to modify certain headers to fit. FC engines do NOT have that.

Mazdax605

iTrader: (5)

Engine mount ****? I am not sure what that is. Can you point it out in my pics somehow?

Stevan

iTrader: (17)

Maybe Peejay meant "nub".
Pic 1 is 84,85 SE, 2 is S4 under the exhaust manifold, where the nub would be if it was an SE.
What it's for, I don't know.

Jeff20B

iTrader: (13)

This 'nub' is supposed to be for motor mount studs similar to the other side where the motor mount is attatched on an FC. Interestingly enough, the 6 port 12As had this nub thing too, making it especially difficult to install a header on them. All you have to do is trim a little steel off the header flange, as I intend to do for my 6 port 12A if I ever do a header on it. Pretty easy.

As for your pictures, those look like classic GSL-SE exhaust ports because you can see they open late as there is more aluminum there to port downward than a RE-SI would have.

The final word is you have a genuine GSL-SE engine. You do not have the slightly more rare RE-SI.