Was changing the liner, mod, bottle, and a couple other things on my new M3 compact last night and noticed something interesting... The factory shroud is too long and won't allow you to open the valve adjuster all the way.
On a 4 line valve housing, full open is 1.5 turns past the 4th line. However on my compact the knob hits the shroud at about 3.5 lines... See the pic below.
The fix was to put the shroud in the lathe and remove 0.050" from both ends for total of 0.100". You can't remove all 0.100" from a single end as there isn't enough internal thread length on the shroud and the cap would run out of thread before the shoulder seats against the shroud.
After removing the 0.050" from both ends, you can now open the valve adjuster to the full open 4 line + 1.5 turns and still have additional clearance between the knob and the shroud.
Just something you need to watch for on an M3 compact if you aren't getting the muzzle energy you think you should be, having the valve limited to 3.5 turns open can certainly limit output on a higher energy tune.
On a 4 line valve housing, full open is 1.5 turns past the 4th line. However on my compact the knob hits the shroud at about 3.5 lines... See the pic below.
The fix was to put the shroud in the lathe and remove 0.050" from both ends for total of 0.100". You can't remove all 0.100" from a single end as there isn't enough internal thread length on the shroud and the cap would run out of thread before the shoulder seats against the shroud.
After removing the 0.050" from both ends, you can now open the valve adjuster to the full open 4 line + 1.5 turns and still have additional clearance between the knob and the shroud.
Just something you need to watch for on an M3 compact if you aren't getting the muzzle energy you think you should be, having the valve limited to 3.5 turns open can certainly limit output on a higher energy tune.