ok so i know that fd and fc seals will swap... depending on 3mm or 2mm i havent got my engine torn down yet but i know the apex seals arent making compression. i have the chance to buy some apex seals for a really good deal but they are 3mm.. is there anyway to tell what size i could use ?

 

You have 2MM seals assuming a stock engine.

 

All 86-95 rotary engines use 2mm seals stock. There is no difference in the seals between those years, they are all the same 2mm 2pc version from mazda now. The only thing they changed in the FD engine were the corner seal springs, which are a recommended upgrade for an FC during any rebuild and don't cost more than about $30.

Now, if the engine has been previously rebuilt, then there is no telling what you have, you will just have to wait until you get inside to find out.

 

no its a stock jdm engine. i can pick up the 3mm seals for 100 bucks... or.. i have a cahnce to get stock TII seals for like 35 dollars

 

yeah the TII seals are used. he siad they were in good shape and look that way. he couldent give me milage but he siad it was a well running engine b4 he tore it down. if i had to do all that work id rather just buy oem. oh-well. thanks for the info about milling the rotor thats what i wanted to know

 

Just buy some new rotary aviation seals. You dont want the hassle of 3mm seals.

 

Amen...

 

I agree. NEVER use used seals under any condition. The cost of new seals is NOTHING compared to the cost of everything else associated with a rebuild.
Also, do not use the 3MM seals. You will spend more money making them fit that you will save buy getting the seals. Also, they really aren't as good as 2mm seals. They are slightly more resistant to detonation, but they don't seal as well.

Do not EVER under ANY circumstances cheap out on a rebuild. It will do nothing but cost you way more money down the road. Apex seals cost about $220 for a whole set at www.atkinsrotary.com Compared to the cost of a while rebuild, its really not that much.

The bottom like is that if you can't afford proper apex seals, then you can't afford a rebuild. Period.

Also, make sure you replace all of the springs with new ones.

 

my engine doesnt have alot of miles on as stated its a jdm engine. havent torn the engine either but so far i belive thathe seals really arnt bad i belive its the springs. i got to thinking, it had been sitting for almost 20 years now then being swapd into a car just a few months ago and never starts... i belive its springs. i was thinking on buying the atkins rotor rebuild kit for it if that is the problem but we'll see what happens. thanks for all the help

 

If your short on funds, you can actually reuse the side and corner seals, just make sure to replace the apex seals and all springs.