Chainsaw Repair

...back to intake tuning.

once the case resonance Hz is found, the next thing that can be looked into is Pulse Tuning.

as per the delivery ratio paper by Nagao & Shimamoto....page 7.....(link is up thread somewhere).

idea is to to use differing lengths and x-sectional areas of the of the intake tract to get " 3/4 of the period of pressure fluctuation coincident with the port opening period."

best pulse values are between 0.7 and 0.8, which in turn give the maximum delivery ratio.

goes like this:

(more to follow).