LD1
Epic Contributor
Backpressure itself is incorrect vocabulary to describe it.I'm kinda wondering if it's not specifically back pressure, but kind of like you mention in you last sentence, creating a pulse in the exhaust and intake so that the intake charge piles up against the back pressure, just before the port closes and goes into compression, and the opposite when the exhaust port open, it's being sucked out. I'm sure there is a vocabulary to describe this.
But there is no "tunning" in a chainsaw muffler. Its simply an expansion chamber that allows (for lack of better terms) and time delay release of exhaust gasses to quiet the sound. Nothing more.
If back pressure really were a good thing....muffler modding a chainsaw would be a bad thing. But it isnt. Open up the muffler and you can notice the results on a chainsaw.
I have said all I can about this topic, so as far as Im concerned....Im done discussing because there is no point arguing til we are all blue in the face and then walk away with the exact same opinion/notion in our heads.
You can google the topic.....its discussed at length. Some think backpressure is good, others do not. To each his own and Im not trying to convince anyone, just educate. Do your own research and make up your own mind