Chainsaw Repair

this is what i found.

the pressure graphs of the crankcase are not showing the vibrations waves at all.

only the ports are showing them.

so, the piston gets the wave motion going, based on rpm.  moves the air in the case, the air in the case then gets the waves going in the ports.

interesting thing is the intake likes about 4x the rpm, and the transfers like around 8x the rpm Hz.

for the guitar playing folks:  on the open "e" string.....after pluckng......harmonics at the 12th and 24th frets.
not exactly.....would need plenty more frets actually, but similar idea.

i like to know the "why" i guess......hahahaha.

screens are showing about 9500+ rpm