Something crossed my mind the other day when I received a new engine plate I bought. The progression Mazda made with the 13B in terms of strength and improvements have been S4<S5<S6, with the upper dowel lands increasing in strength every time, as well as stat gears, etc.

Well, I just received a new S4 TII rear iron, and was very happy to find out that it had the S6-type upper dowel land:

Now, being that Mazda now includes their structural updates on newly-produced parts, is it possible that a newly purchased set of S4 stationary gears would now be heat-treated similar to the S5? Are there other updates that would be carried into new runs of this older engine?

 

i don't know about the gears, but when the rx8 came out, the rotors have a cut on both sides for high rpm clearance. http://www.racingbeat.com/Mazda-Perf...rtNumber=10040

they have since started doing this to ALL of the rotors.

 

and supposedly Mazda has gone back to 3 piece apex seals, if the rumors are true. Which means we can probably expect 3 piece seals on whatever rotary they end up coming out with next.

 

how much $ did that cost?

 

I got mine from redtail-racing.com, They have a few S4 and S5 TII parts laying around that are brand new.


Nobody else know anything about stat gear or oiling updates on new runs of engines?

 

thanks for the info, i'll check them out