Chainsaw Repair

Quote from: 1manband on March 24, 2016, 04:33:11 pm

Quote from: 1manband on March 23, 2016, 03:09:18 pm

side note:  the intake/crankcase res formula, much like exhaust formulas, are based on sound waves.  through experiments, folks found that they approximate physical testing of pressure waves.

sidetrack to some pressure things.  intake-crankcase tuning is interrelated to porting. since the size of the hole also affects the intake/crankcase Hz. this helps show what is ideal.

interesting thing at transfer port just close at higher rpm.

from reference #2 below.

......i see nobody caught my drift on the interesting comment?......will be back, have to draw something.

Are you referring to the sound waves and pressure waves being similar to one another.

that too.

that was my biggest head scratcher of all.  the sound waves and pressure waves, are supposed be similar.

none of these crankcase pressure graphs are showing any evidence of this at all.  they should be vibrating like a guitar string. and they are not.

could not figure out why.  then had to read read and read some more.  then i got it.