onepointone

ok, i dont know if it is too early to tell or not, but im pretty sure ive secured a 4 port 13b from the previous owner of my car. either way, the motor is getting a rebuilt kit and street port. but i have questions..

i originally wanted a 89-91 n/a 6-port, but after researching, i found 4-ports are my desirable for porting. why is that? are there any other advantages to a 4-port?

will i still need the 12a front cover and racing beat engine mounts? ive never looked closely at a gsl-se's mounts.

it will still bolt up to my tranny like the fc 13b will right?

what clutch/flywheel to get? the one that matches the motor right? and it should mate with the tranny fine right?

im pretty sure its going to be carb'd, would a webber be good? can someone direct me to a thread with good info? i didnt really find much, or someone willing to do a run down to educate me a little, that would be GREATLY appreciated.

the motor is coming out of a parts car, what are other things i should grab off the car along with the motor?

the motor will be COMPLETELY stripped of all emissions, anything to look out for? if i have an aftermarket manifold with carb, there really isnt anything to look out for is there?



i think that covers all my questions... anything i might of missed? any help is appreciated. thanks

moremazda

iTrader: (4)

The four port SIDE PLATES are more desireable. They have more metal to allow for a larger port. Now, if you use GSL-SE rotor housing, you could always put in a set of 89-91 n/a rotors, with a large street port

If the motor you are getting comes with an old school front cover you will not need to use a 12a front cover. You WILL need the RB engine mount OR the GSL-SE cross member.

Yes!

When doing a mix and match like this, get the flywheel for the motor and the clutch for the tranny. Don't mix n/a and turbo. Just FYI all n/a clutches will inter-change.

A Webber down draft or side draft. IMPO you should do a Gene Berg IDA replica. Unfourtunatly they are really expensive, but just flat bad-***!! A side draft is also a good choice just not optimal if you go with a really large street port. IMPO go to Mazdatrix for the side draft or to Gene Berg IDA for the down draft.

Nothing but the motor

Nope!



Fuel pump, exhaust, radiator, you do have the oil/air oil cooler right, might as well do the SS braided cooler lines. Oh damn I could go on for days.

Good luck
Ryan

onepointone

now, i have a second gen fuel pump out of my dad's 87 n/a. i have almost everything from a 87 n/a but rotor housings and one rotor, (he threw an apex seal about 2 years ago) would the fuel pump work, or do i need the gsl-se one? OR, do i need an after market one for the carb? i dont really plan on getting something hardcore due to money, but i do realize this will take a while to get all the things i want. im not possitive if im going carb or not, but its a possibility just to make it alot simpler and some power power.

also, you say the engine flywheel, with the tranny's clutch? will the flywheel and clutch mate correctly?

ONE more.. how much do 89-91 n/a rotors go for? im not going to buy new ones seeing how i dont have the money for it, but i might be interested in used ones. will the rebuilt kit work for the rotors? ie: seal springs, corner seals ect. i know the S5 apex seals are 2mm and the gslse ones are 3mm, so i might just stay with the rotors that come with it.

i hope this deal goes through..

hornbm

just so you know... the 89-91 rotors arent that much better, and dont give very much more power than the 86-88.

The reason why there was a power increase from the 86-88 to 89-91 was mainly because of the changes in the intake manifold.

So if you must have s5 rotors.... fine, but everyone wants to get them, so as a result their quite a but more expensive than the s4 ones.

Actually in my car, i am doing an 89 motor setup, but with an 86 block. When i wanted to get my motor from pineapple racing, rob told me it might be weeks or probably months before he got another s5 n/a core.

Just something to think about

Oh yeah the only advantage to a 6 port is better low end responce, but they are impossible to port.

onepointone

well thats what i want, power down low. i dont think im going to go with the s5 rotors seeing how it would cost more money, plus i would have to mix up a rebuild kit.

does anything know a close figure a 4-port, street ported, racing beat header, full exhaust, and a webber would be? i would be more than happy with 160-170 for the time being, but i dont know if it would be in that ballpark

SoRRoW

You need to figure how yoru going to make this 4 port before worring about HP wise..

What housing,what rotors, what plates.

Theres **** loads of way to go about this,

I plan on making an easy 200+ on my 12A nothing seriuos,and hope you can make thats with a 13b atlease

onepointone

see thast the thing, i would LOVE to make 200hp, but my problem is money. i guess, beforei talk about hp, and even more before i talk about how im going to go about this, i need to get the motor in my hands, the deal has a VERY small chance of not going through, but i dont see why it wouldnt. i need to get the motor, tear it down, and see whats usable and whats not, im hoping to reuse the rotors and housings, but if they are in bad condition, i guess they will have to be replaced. if i could make 200hp, i would be way more than content

hornbm

well i said that porting a 6 port is impossible.... thats not entirely true. You can make a small street port, but thats about it.

Also if you are concerned with low end power, keep in mind that any porting will hurt your low end power. The bigger the port... the less low end you get.

Now for a four port... u usually use 13b rotors and housings, and intermediate housings... then 12a side plates.

The water seal was moved from 86 on (they changed it back to the old way on the renesis odly enough) and I dont remember if this becomes a problem when trying to make a four port.

Also all turbo motors are four ports, that might be a solution for you but you'd have to put higher compression rotors if your going to run the thing N/A. I dont know if anybody has done it that way though.

SoRRoW

I ve seen a car with a bridge ported 6 port.

I didnt see the port job.

Theres suppose to be soem guys out in the Orlando FL area (Kissime) that can take 86+ rotor housings and cut the water seal groove in them.they are done perfect and look OEM,I was talking to alot of racers at Rotor fest in FL couple months back and they were telling me abotu these people.

I have seen one of the rotor housings they did and it came out sweet.

onepointone

Yeah get your engine.
Expect one of your rotor housings to be flaked,If its not then your doing good,

What year engine are you shooting for? 84/85 would be your best bet to make a 4 port,Unless you can get a TII engine

PaulFitzwarryne

hornbm- on using a 13BT for a NA, a member on the forum Brownie has had a series of threads about his car and has done that, he said it was common in the city he comes from.

I thought about it and the concept is that there are many cheap low mileage 13BTs around that its cheaper than rebuilding an older 13B. Also reverting to carb cuts out the cost og going efi with an ecu and upgraded fuel system.

hornbm

No way, I've been told many times that 6 port engines cannot be bridge ported. Just look at a stock side plate for a 6 port, and a brigged 4 port plate, and it will be pretty obvious why it wont work.

Someone back me up on this, because I know I'm not talking out of my *** on this. Mazdatrix has a very ggod explanation on their site about 6 ports and porting... its so ristrictive, that mazdatrix refuses to port 6 ports at all.

SoRRoW

Like I said,I didnt see the port job.

Hes got a first gen with a bad *** orange paint job,
18 in wheels (Which you probally think wont fit either)
I think a 245 in the rear.

Running a 6 port 13b bridge ported,with a old Jaytech intake Holley carb,Escort 2 E fan.

Ill see if i can find a pic of it from a local show,

Ok anyways on the porting work on a 13 b n/a,

RacingBeat says you cant port a 6 port,Well guess what..Mazda trix sell the templates..

So who To belive?