matthewpims

Ok, im not by any means new to rotary engines but I am new to building them. I am building an engine for my 84 gsl se and its going to have an 88 n/a rotating assembly. That is possible correct as long as I use the 88 counterbalance?! Also a few questions, I know the se rotors are 9.4-1 compression, what is the compression of the 88 na rotors? I was told its higher. I know that the se rotors have 3mm seals and the 88 s5 rotors have 2 mm seals, is there something about the 6 port induction system on the se engine that requires 3mm seals or what. Im planning on using gsl se 6 port housings and induction systems and s5 88 na rotors and e-shaft. Any comments or suggestions would be very helpful. thx
matt

wwilliam54

make sure the rotors match, and you use the front and rear counter weight
for the rear you'll have to find a 88 auto counterweight to use with an aftermarket flywheel

matthewpims

Ok so basically, use the front and rear counterbalances attatched to the eshaft, but why do I have to get an 88 fly balance to put on a lightened flywheel, I thought that with a lightened wheel you didnt need a weight or something im lost lol

gsl-se addict

iTrader: (3)

Matt,

Check this chart out.

http://www.mazdatrix.com/faq/rotorwgt.htm

If they are 88 rotors, then they should be S4, not S5. As you can see, they have the same compression as the SE ones, but they are lighter. You will need a counterweight. They cars with manual transmissions have the rear counterweight built into the flywheel. You will just have to get the rear counterweight off an 86-88 automatic or buy one with the flywheel.

BTW, make sure that the rotor housings and side housings are both from either the SE or the 88 because the grooves for the water seals were moved from the rotor housings to the side housings after the SE.

Kent

matthewpims

Ok, so where can I buy a counterweight for the automatic? Will a local parts store carry them? Now basically sense gsl se housings are either insanely expensive or cant be found used im going to have to use the 86+ side housings from the donor block too, thus creating another problem, Can I use say 89 rotors, housings, and the gsl se 6 port induction system (manifold etc) on the 89 housings, or am I going to inadvertantly have to do an entire engine, ecu swap?

gsl-se addict

iTrader: (3)

So, Matt, what is the condition of the SE engine. Do you have the 86+ engine for it? You should be able to use the SE intake with the 86+ engine, but the advantage of the later intakes is that they flow more. Depending what you are after and how much you want to spend, you may want to get an 89+ engine and ecu (160 hp) in NA form. They do however use an electric oil metering pump, so you would have to swap out the harness and ecu or eliminate the omp and run premix. An aftermarket ecu would be another option.

It would help if you let us know what you have, what you want to spend, and what you want in the end. I am sure that someone could propose some good options for you.

BTW, the counterbalance can be purchased with the aftermarket flywheel or you could probably pick one up in a wrecking yard.

Kent

matthewpims

Ok Fair enough, I appreciate you trying to help me along, lol.
I own an 84 gsl se, the engine runs good but compression is down to about 90 per face, give or take a few. The engine has 216k miles on it, Runs strong, but is noticably tired. When I origionally purchased the car I was forced to drive it to dayton ohio from dallas tx. Shortly after I started premixing because I learned the omp failed. With that many miles and with a bad omp for an undisclosed amount of time Im sure the engine is beyond rebuild in its current form. My goal for the car, with this engine is to have something different. I want more power but dont want to go through the hassle of forced induction, or swapping out ecu's etc etc. I dont want to spend more than a little over a $1000. and so far im doing quite well aquiring all the parts I need and still meeting that goal. I have roughly 300 in it so far and have, all gaskets, seals, a set of mint 88 rotors. Im currently buying an 88 core engine for the housings etc. What I need to know is weather or not I can use the 88 rotors, and housings. Then the gsl se e-shaft, front cover, and intake/fuel system with that combination. Mind you the engine however it ends up comming together will be modified, as well as the intake system. Ive been porting heads for 351w engines for about 5 years now for race applications. My goal was a little bit more than 130hp. I understand how it would all go together but im not familiar with the rotary balance system. I thank you again.
matt

gsl-se addict

iTrader: (3)

Matt,

Thanks for further explaination. It think it really helps in terms of allowing us to provide some recommendations for you. You will be fine using the SE e-shaft, front cover and intake for the 88 engine. The seals you bought were for the 88 engine, correct? You could do some porting, but there isn't mush to gain while retaining the 6 port accuation. If you don't want to invest in an aftermarket flywheel, you should be able to just use the one off of the 88, if it is manual. The rest of the 88 engine would be retained. I am not sure if you would really gain anything by using the SE e-shaft and front cover. I would just use the ones off of the 88. I just hope the housings are good on the 88 because if they need replacement, it will cost quite a bit.

The only difference is the later models used a thermal pellet in the e-shaft to control oil flow. These sometimes fail, so I believe that some just remove them. I know you can get an upgraded thermal pellet from atkins. Just ask atkins or the 2nd gen forum about this part when you get to it.

I do know that some run a 2nd gen intake on their SEs to pick up a little more power. The 88 intake has larger butterflies and intake runners. You could just use your SE injectors in the primaries and leave the secondary injector holes blocked off.

This site talks some about using the 2nd gen intake, but it doesn't look complete.

http://max7.rx-7.org/thecar_how2.htm

If you don't have to worry about emmisions, then you could look into exhaust upgades for more power. Hope this helps some.

Kent

matthewpims

Its helped me tons thank you very very much. I would use the 88 core whole but I was under the impression I needed the front cover to get the engine to fit on stock mounts. I wouldnt worry about the intake manifold and tb, I work wonders with that stuff, so it'll flow much much better than it does now. I have already purchased the thermal pellet for oil pressure. haha Real quick is there any need or way to run more than the 75 psi my oil pump is pushing now? Yes all the seals were for the 88. The only thing I have left to get aside from the core itself is the water seals, no biggy. Again I appreciate the hell out of the time you have spent to try and get me straightened out.
ps what emissions?! hehe

gsl-se addict

iTrader: (3)

Matt,

No problem. I am happy to help as much as I can. You are right about the front cover. I wasn't thinking about the different mounting. It sounds like you have pretty much everything figured out. Let us know how it goes. Feel free to pm me anytime if you have questions. I will try to help as much as I can.

Kent