And that's with 2mm seals that are the 'full' height of a FD 13B seal? If you don't mind me asking, how did you cut the rotors? We did ours on an EDM wire cutting machine and were worried about going too deep, into the oil passages. Although, it might be doable to run 2mm deeper, but not once you cut them out to 3mm as well.

 

3mm is not recommended, your logic baffles me, but my work is done here regardless

 

I used a slitting saw on a mill, this allowed me to test fit and check clearences over and over again

 

I was planning to do the same exact thing and I found A slight problem with building a fixture to do this.

I was planning to make a tall jaw for the back of the vice to hold the rotor. It would be located by two dowels which would fit into the corner seal holes. This giving me the oppertunity to just rotate the rotor 120* to cut the next apex seal slot.

But the distances are so far all over the place, a fixture could not be used. What a pain in the ***.

 

If I were going to upgrade seals, I wouldn't go 3mm. I'd have the grooves machined deeper so 2 piece RX-7 seals could be used. While the seal is no thicker, the seal is twice as tall which by default is an increase in strength. Being taller means that it's movement within the groove won't wear the rotor grooves as severely either.

 

While I agree with you guys wholeheartedly on this being less than ideal, the point of this modification was not to improve strength or get any performance benefit out of anything. It was to save a set of rotors that had severely splayed out grooves and that 2mm apex seals would have WAY too much clearance in.