Are all side seals alike?
I understand that the later 13B side seals are thinner.
What is the truth?
Thanks~ JEB

 

The new side seals are thinner some of the oldr rotors used 2 side seals.

 

1985 and earlier, the side seals are 1.0 mm thick (and 3mm apex seals). 1986 and later, the side seals are 0.7 mm thick (and 2mm apex seals). Prior to '74, the engines had double side seals. 13B and 12A makes no difference.