the shop manual (94) sets standard apex seal to groove clearance at .002 to .0039 w max .0059.

i assume that is for 2 mm apex seals. i was unable to find a value for 3mm in the manual nor is there one on bruce turrentine's video.

i am tracking down the reason for 65- 75 psi in the rear rotor of a 180 mile newly built motor ( the third this year) and would appreciate the 3 mm clearance value. my side seal clearances are sloppy too at .005 to .008.

how would sloppy apex seal clearance, if i do have it, effect the motor?

thanks,

howard coleman

 

It would not seal properly, thus could be the reason for poor compression numbers.

 

try the rotary performance section howard.