Correction
The FA-180 has a 1.1mm longer stroke than the FA-150 & the FG-57/FG-84 derivatives. (not .9mm as previously posted)
FA-150/FA-300T/FA-459R3/FG-57T/FG-84R3 all have 27.5mm stroke.
FA-180/FG-30 have 28.6mm stroke.
This is why the 36mm pistons for the gas multis are approximately .55mm taller from wrist pin to crown than either the FA-180 or FG-30 which uses the 36mm FA-180 piston.
These differing compression heights compensate for the differing strokes while maintaining the same relative total height of the piston crown from crank throw C/L.
Last edited by SrTelemaster150; 04-05-2015 at 04:14 PM.