I have to rebuild this car and I want to do it right. I will be porting the intake and exhaust and want some educated, experienced answers from those of you who have done this before. I am gonna add a turbo to it as well and all in all just want a fast-*** road car. I own an '85 gsl-se with at 13b 6 port engine. Thanks, in advance for the advice guys!

JC

 

Why that would be a streetport. Mazdatrix sells the templates. Be sure to upgrade the oiling system to handle the turbo, using 85psi rear regulator, a new 17.5mm oil pump, -10AN oil lines.

 

Man now that is what I'm talkin' bout. THANK YOU VERY MUCH!!! Hey, let me ask ya another question. Is it a worthwhile idea to ugrade the rotors to a racing level rotor ...say from RB. and also upgrade the seals to racing seals? I know, I know, some serious bucks (for the rotors anyway), but I've got the cash to do so and don't know if that would be a good investment.

 

give this guy a call, and maybe a visit
http://www.rotaryresurrection.com/
i hear hes a really good rebiulder and he is close to you

 

I got the same referal from another thread I had earlier today from someone else. I certainly will give him a call and actually he is only about 50 miles away...so a quick visit will do me some good. Again, thank you for your help and time with these questions.

JC

 

lightweight rotors help the motor spin up faster, but are not cheap. an aluminum flywheel is much cheaper.

it would be worth it to use low compression rotors from a turbo rotary. that way you can increase the boost. 89-91 Turbo ][ rotors are low compression and lighter than earlier rotors

 

I don't think it's worth it to switch to rotors unless you find a good deal on TII rotors. Stock ones are low enough compression to run plenty of boost, I ran 16psi on a bone stock 135k mile 12a engine without any problems. I would upgrade the apex seals and go with solid corner seals. For porting I would go with a streetport intake, but go a bit bigger(farther down) than the template on the exhaust side.

 

Are the TII rotors interchangable with the 85 13b engine? If so, then can I run this thing without turbo for a while so I can build this engine in stages...1. Internal engine components, ie. rebuild, port, seals 2. External engine components, ie. Turbo, fuel pump 3. Peripheral components ie. brakes, tires, tranny, cooling system. I will also give that guy at rotary resurection a call to see if he can hook me up with those rotors...If not then I will go to rb and pick up a set of them. I have also been looking at the difference in the aluminum vs. lightweight flywheel....any pros or cons. to either one?

Thanks for the help guys.

 

running low compression rotors without a turbo makes the motor slow.

 

THat may be true, but it will run. If your future plan is to run a turbo, I would suggest running the lower compression rotors. The engine will last longer with these rotors. It will feel slow without the turbo on low compression at first, but it will be worth it when you get the turbo. You should run an intercooler either way though.

 

Well, seeing as 89-91 TII rotors are 9:1 and stock SE rotors are 9.2:1 I don't think lack of compression will be much of an issue if you run them without a turbo. The fact that they're quite a bit lighter might actually help increase performance.

 

That's cool! Thanks guys. What range of boost,ie: 5-10, 10-15, 15-20. should I expect to run once I put the turbo on? I want a fast-as-**** fun car that will last at least a 1 to 1 1/2 years or so without toooooo much worry about major malfunctions happening.

 

Boost/power all depends on the turbo/intercooler/fuel system/etc... So until you know your exact plans it would be hard to say.

 

i would run the 85 rotors
the will give a little more low end, and since its boosted, the loss of a litlte revability wont matter (they weigh more)

 

I think 12 psi is plenty with an intercooler and a good fuel system. You could do more, but I think that 12psi will provide plenty of power (at least 270hp). Ask directfreak. I saw a vid of him dynoing his car (I think it was a 4 port 13B with a Holley 600 carb), and at 12psi he made over 300 RWHP. at 17psi, he made 370 RWHP.