Ok somy question is I am going to be building a 4port 13B using 12A plates and early 13B housings. Which rebuild kit should i buy? If I buy a cheaper 12A kit I know i will have to buy a 13B exhuast gasket but what intake gasket do i need to use? Are those the only thing not in a 12A gasket kit that i will need? Of course aside from the hard seals. I did a search and found alot about this engine but these are just a few of the things i coudn t find. Thanks for any help.

 

come on some 1 knows what i am talking about? Dan you would know where are you?

 

if ur using 13B housings and rotors then 12a apex seals wont be wide enough. youll probably need a 13B oil pan gasket too...
but ive never built a rotary, just taken apart alot of them.

 

oh, and I think mazdatrix sells an intake gasket for a 13B 4 port motor. i dont feel like finding the link

 

Good call didnt think about the oil pan gasket. I know most of the hard seals will have to be for what ever rotors i am using. I am eight gonna go with S5 rotors or S3. I am gonna be using a SE e-shaft.

 

When building a hybrid engine, buy the correct rotor kit for the rotors you use, then a gasket kit for the block configuration. Spend the extra and buy the rotor o-ring carriers too.

 

rotor o-ring carriers are you talking about the metal oil rings? I am plaining on replacing bearing also. So new bearings apex seals and springs solid corner seals i already have 3rd gen spings. New side seals and springs and Vition o rings. I was wanting to know if the 12A gasket kit will give me enough to rebuild the 13B. What is different in the rebuild kits? I know when i bought my last kit from atkins they sent me an 80. Seamed to work ok on my 85. But thanks for the input

 

This is what I would do:

- 13B 4 port gasket set
- apex seals, springs (3mm if S3, 2mm if S5)
- side seals (optional), side seal springs
- metal carriers (optional), oil control springs (you can get competition outers from Mazdatrix), o-rings (get Mazda, not Viton)
- bearings (optional)
- FD corner seal springs, solid corner seals (or stock)

For the gasket set, the main difference between 12A and 13B will be the oil pan gasket, intake gasket, and exhaust gasket. The OMP gasket/o-ring are different depending if you are using a 12A OMP or one from a GSL-SE/2nd gen. I am rebuilding my SE now. I already had the intake, exhaust, and a good oil pan gasket. I decided to get a 12A (81-83) gasket set from Mazdatrix. It was aboutr $100 cheaper than the GSL-SE one ($80 or so vs $180). Some guys just use RTV instead of an oil pan gaket. You can make your own intake gaskets if needed. Just something to think about when buying gasket sets.

 

Side seals rarely need replaced, springs do. Measure the side seals before you order new ones, they can be a pita to trim to fit. Biggest differences in the kits will be the intake, exhaust and oil pan gaskets. Maybe even the front cover o-ring, but that's usually in the 2nd gens. Yes, I was refering to the metal oil rings. I thought I saw Atkins offering a gasket kit for the older 74-78 13Bs, that one should work for you. You may need to make your own intake gasket, but order a TII one anyway.

 

Yea see that is why i am thinking about using a 12A gasket kit. I will not be running a omp. I will be running premix. But why the oem and not vition?

 

How can you tell if the metal control rings are good or not? I have taken many engines apart and only found 2 rings that where cracked. Even the ones that came from the motor that spun a rotor bearing they looked good but i threw them away.

 

There is a measurement spec in the FSM. I have yet to find a good way to measure the wear accurately.

 

Ok so as long as there not bent broke or any noticatible damage then they should be ok to use? Hopeing to order my new bearing this week.

 

I'm not sure how you managed to read that into my post, but if there is any doubt, measure and/or replace them.

 

Read in the Pineapple racing vendor section on here. They have some good info on rebuilding about the Mazda vs. Viton. I will tell you from my experiences. I have tried to use the Viton o-rings once before. You have to understand that they will work, but the fitment is poor since they are not metric sized. They will fit very tight and will likely break the metal carrier, especially if the carriers are used. I decided not to use them. I changed to new carriers and went with Mazda o-rings. They are a bit more expensive, but fit correctly and are proven to last. Get the green inner/outer. They also come in black, but the green are supposed to be better (especially for racing). Some builder do use the Viton, but it takes a bit of practice to get them in without breaking the carriers.

 

get your 12a running first before you think about another engine

 

It is running i just cant drive it. runs kinda ruff with the holley. Everything seams ok. Should get my racing beat intake this week. Did you ever sell the dellorto?

 

where do you buy a 12a rebuild kit anyways. i cant find one for a 83 only 84-85.

 

USE THE 84-85 ALL OTHER 12a REBULD KITS HAVE BEEN DELETED.

 

mazda dealer or autozone autozone is the cheapest i can check with mazda tomorrow i can get a killer disount were you located and 84-85 will work cause i pretty sure the 83 is the same i might be wrong on that dont quote me

 

i am in Twenty Nine Palms Ca so autozone sells a kit. i am new to rx7s and i dont know what all i need as far as a kit all i know was my car ran out of coolant making it overheat also i pulled the spark plugs out and found coolant on them. Do i need apex seals also or should i just let them be. also i have an idea of how to street port but i was just wondering if you could give me some tips or if i should let that one be. i have a full shop i can use and i would like to do it myself. any help would be great

 

Before buying a kit, tear the engine down and see what parts you need, including housings, rotors and bearings.

Download the FSM from the link in my sig line.

Pick up one of the rebuild vids too.
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